The most commonly asked questions about Air Source Heat Pumps IV

16. Is an air source heat pump suitable for an existing house as a replacement for a gas or oil fired boiler?

It is unlikely that an air source heat pump will be considered as a direct replacement for an existing boiler, unless the present system is considerably updated to ensure that the air source heat pump can sufficiently heat the property. This will include a full and detailed heat loss calculation, radiator replacement, cylinder replacement, as well as an assessment and possible upgrade of the properties insulation. However an air source heat pump can always be used as the main heating source, provided a back up system is also incorporated.

17. What are monovalent and bivalent systems, and which is best?

With a monovalent system, the heat pump is designed to provide all the required heat. Initial capital costs however, may mean it is more economical to use a bivalent system where the heat pump only covers the base heating load. An additional heat source e.g. oil boiler, gas boiler, or electric back up, will meet the remaining peak demand. Which system to choose, purely depends on the home and heating requirements.

18. What type of controls should I use?

It is perceived that the ideal heating arrangement for ASHP installation is a well designed under floor heating system that uses low temperature water as its heating medium. The controls for the system will be as specified by the underfloor heating manufacturer. A temperature sensor on the heating system, will control the running of the water circulating pump in the air source heat pump, to achieve the required target temperature. If the heat pump is to also be used as a supplement for domestic hot water, via an indirect cylinder, then a traditional 'S-plan' type arrangement can be used.

19. How easy is a Detian air source heat pump to install? Air source heat pump is supplied fitted with the weather compensation unit and electrical backup. Only two pipe connections are required from the house: heating system flow and return, and an electrical supply. The heat pump itself should be placed at least 300mm from the wall to ensure that there is an unobstructed air flow to the unit.The electrical supply should be fed from a dedicated MCB with a suitable external isolation switch, situated near the heat pump.

20. What cable size should be used to connect the air source heat pump to the mains supply?

Cable size will vary dependent upon the size of heat pump installed, type of cable and its length of run. We recommend that all electrical work is carried out by a registered and qualified electrician, in accordance with current legislation.

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The most commonly asked questions about Air Source Heat Pumps III

air source heat pump water heater

11. Can an air source heat pump meet all the heating and hot water needs for a house throughout the year?

Under anything but the most severe weather conditions, provided the property is well insulated and the unit has been sized correctly, the heat pump will supply the necessary heating requirements for the majority of the year. However, in any situation where the weather can be severe, a supplementary heat source will be required to maintain target temperature. This would normally be provided by a backup immersion, but could also be in the form of a supplementary gas/oil boiler.

An air source heat pump works at a higher COP when run at lower flow temperatures, typically 35-50^oC. Domestic hot water is normally stored around temperatures of 60^oC, so it is therefore likely that a supplementary heat source in the form of a tank immersion element may be required, especially if the heat pump is the only provider of domestic hot water and is not being assisted by solar thermal.

12. What water temperature will the air source heat pump generate?

Even at a temperature as low as -15^oC, air contains a certain amount of heat. In the United Kingdom it is rare that our external air temperature would fall below this point, meaning air source heat pump technology can be a very effective heating method. In traditional terms an air source heat pump produces low temperature water, in comparison to traditional heating appliances. This is due to the following:

1) The physical properties of the refrigerants used are limited to the amount of energy that they can absorb and therefore give up, further into the process.

2) httphttp://www.fsdetn.com/The ambient air contains insufficient heat energy to successfully boil off

the refrigerant vapour.

Refrigerants used throughout the industry can comfortably produce water temperatures in the region of 50^oC based on current independent testing criteria.

13. Can I connect an air source heat pump to my existing hot water cylinder?

Due to the lower water temperatures produced by a heat pump, any heat exchange taking place in an indirect cylinder will require a coil with a larger surface area compared with that of a traditional cylinder. This will ensure efficient heat transfer. Therefore it is recommended that the cylinder be checked for suitability and changed for one designed for use with heat pumps. Grant produce a range of ASHP cylinders, specifically for this application.

14. I am aware that an air source heat pump works well with under floor heating but can it also work with radiators?

A heat pump will cope well when used with panel radiators, provided that the system is properly designed and that the building has a high level of insulation. Due to the lower temperatures involved, radiators have to be over-sized and the heating will need to be on for longer periods, in order to meet the heating demand. Customer perceptions may be different as the radiators will be cooler to touch, giving the impression that the heating is not functioning correctly, even though room temperature targets are being met. Radiator and underfloor heating systems can also be combined.

15. Can I heat a swimming pool with an air source heat pump?

Yes, an air source heat pump can be used to heat a swimming pool provided the system is correctly designed and the heat loss is calculated. The system design must ensure that the swimming pool water does not come into direct contact with the heat pump components.

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The most commonly asked questions about Air Source Heat Pumps II

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7.What will happens to the performance of the air source heat pump if the air temperature drops or higher setting water temperature?

All air source heat pumps will have a decrease in output if the air temperature is cooler than the standard test conditions (STC). This is also true if the system water temperature is raised to a higher temperature than the STC. It is therefore vital that an accurate heat loss calculation is carried out to ensure the sizing of the heat pump is correct.

Not surprisingly, if the air temperature is higher, or system water temperature is lower, an increase in output can occur.

8. How does air source heat pump water work in chilling area?

Heat pump equipment derived from the air conditioning industry is the result of many years of product development. Although they do work well, the technology tends to be over complicated for domestic heat pump applications and makes installation slow for heating engineers. Due to their design, this technology may require the assistance of a refrigeration technician for installation and commissioning.

Weather compensation is not a new idea for the heating sector. Detian has taken tried and tested technology and given customers the benefit of incorporating it into every air source heat pump.

As the COP of the heat pump is affected by weather conditions, it can sometimes result in poor performance and efficiency. Detian Low Ambient EVI Air Source Heat Pump Water Heater, this improves the performance of the system by increasing the heating capacity, air source heat pump can be working under -20DC ambient

9. How efficient is an air source heat pump compared with a gas or oil fired boiler?

Compared with gas/oil boilers in monetary terms is always going to be a moving target, as world prices for fossil fuels fluctuate. To get a reasonable indicator you have to establish how much energy is produced by, say a liter of fuel oil, along with the cost, and then compare it with the cost of a Kilowatt of electricity to run the heat pump and the pumps output. If the heat pump is more cost effective then the heat pump is more efficient. In environmental terms, the heat pump is vastly more beneficial as it is using solar energy contained within the ambient air to produce heat energy.

10. When the weather is cold will the air source heat pump still work?

For normal air source heat pump, when the weather is cold the ambient air contains less heat energy. At lower ambient temperatures the energy required to boil off the refrigerant, will require more input from the internal compressor. The water will be heated, but at a slower rate, so the efficiency of the heat pump reduces. Low temperatures of around -20oC will affect the heat pump performance in this way.

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Air source heat pump water heater: The most commonly asked questions about Air Source...

Air source heat pump water heater: The most commonly asked questions about Air Source...: 1. What are air source heat pumps (ASHP)? A. Air Source Heat Pumps use basic thermodynamic principles to convert latent/sensible heat (...

The most commonly asked questions about Air Source Heat Pumps

1. What are air source heat pumps (ASHP)?

A. Air Source Heat Pumps use basic thermodynamic principles to convert latent/sensible heat (contained within the ambient air) into heat energy that can be used to provide heating and hot water. In this respect the device can be classified as a renewable energy source because the heat in the ambient air is replenished by the sun.

2. How do air source heat pumps work?

Take refrigerant as the medium, the refrigerant can be vaporized at -40℃low temperature. Therefore, there is temperature difference with outside air. refrigerant absorbs the temperature from outside air, compressed by compressor heating, turn into the high temperature high-pressure gas, exchange heat via the heat exchanger with water, to release pressure via the expansion valve , back to the low-temperature low-pressure liquefied state, through a continuous cycle of refrigerant.

3. What is different about Detian air source heat pumps?
A. Air source heat pumps generally fall into three categories:
1) Units that have been designed specifically for heating only.
2) Units that were originally designed for air conditioning (cooling), but have been modified to provide heating.
3) Units that were originally designed for both cooling and heating with cooling the main function.
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Detian air source heat pumps falls into all the three categories, having been designed specifically for heating homes. The unit is available in five sizes ranging from 6.5kW-15.5kW.

4. Does heat pump products need electricity?
There must be electricity used for compressor and fan normal working.
Air source heat pump water heater's characteristics.
1) without environmental impact, available all year round;
2) the energy saving effect is prominent, and the payback period is short;
3) 3environmentally friendly products, without any pollution;
4) longevity, low operating costs;
5) Run safe, unattended operation;
6) the modular design, easy to install.

5. The advantages of heat pump water heaters compared with the boiler?
High thermal efficiency: air source heat pump water heater thermal
1)efficiency more than 300% for annual average, while the thermal efficiency of the boiler does not exceed 100%.2, low operating costs: compared with oil, gas boiler, 70% of the energy for annual average, and increasing fuel prices.
2) low running costs have become increasingly prominent.
3) No combustion emissions, environmental protection.
4) Unattended safe operation: compared to fuel boilers, running absolutely safe, and automatic control, no staff on duty may be savings staff costs.
5) Module installation, easy to add devices, multiple units installation in parallel mode, when the water consumption increases, add equipment at any time.

6. What are the disadvantages of the heat pump water heater compared with the boiler?
1) More time to heat: air source heat pump take the refrigerant as the medium, the use of compressor compression heating, compared with the boiler direct heating mode, the speed is relatively slow.
2)  One-time investment: compared with fuel, gas boiler, when water consumption is greater than 10 tons, one-time investment is greater than the boiler, the more water needed, the more costs to invest.
3) Heating water temperature is limited to: heat pump water temperature at 60 ° C (water source heat pump up to 80 ° C), air source heat pump water heater could not produce more than 80 ℃ high temperature water or steam.

More information please visit our website: 1. What are air source heat pumps

How to get the right air source heat pump?

Air source heat pump is good investment especially for people who live in warm areas. This is one gadget that save your time for warming water to take bath. This kind of a heater uses eletricity in order to get hot water. It extract energy from the ambient air and then compresses it into hight teperature hight press gas, then transfer and transport the heat to the cold water, exchange heat via heat exchange. This is a good way of saving energy in you house. In order to get the right model of air source heat pump for your house, there are thing you need to consider before you buy.

The first thing you need to consider is your location. It is necessary to consider if your house location is cold or not. You must know what extreme temperature your area get. This point will decide what water heater you need to buy. Air source heat pumps suitable temperature range: -10℃-43℃.

Another thing to consider when you want to buy air source heat pump is the costs. When you go to buy air source heat pump, it is good to be keen so that you get a air source heat pump suit your family needs and budget. Take your tiem to compare and get quality devide, to ensure you get an appliance that within your budget.

Another thing you should consider is doing research when decide to buy air source heat pump. This research will be a good way of having enough information on the air source heat pump you want to buy. By doing research, you will be able to get a good high-quality appliance.

You will know all the kinds air source heat pump after doing research on the market, take your time to pick the best one. Make use of the reviews so that you will know the best. Make reference to the comments from air source heat pump’s user. Get to know the merits and demerits of the air source heat pump which you want to buy. So you are fully aware of what you are going to buy.

Safety is another thing you need to keep in mind you are in the marekt to buy a air source heat pump. To buy an appliance that has safety features. For most air source heat pumps, it is more safer than other water heater, so you just need to pick one which meet your household need.

Another thing you should consider is about energy saving, the one will reduce you bill cost, just like mentioned above, costs is first thing you should consider, but operating cost is more important than it. A excellent air source heat pump will help you payback your buying costs asap. For example, the sum of electricity saving of using air source heat pump for years, ususally, househould air source heat pump will pay back costs need more time than business hould air source heat pump. Some business air source heat pump will pay back in several months.

So spend a little more time to choose your air source heat pump, there is no more trouble at all.

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Swimming Pool heat Pump

The major concerns is running costs for most family who want to buy swimming pool heat pump.

The latest generation of swimming pool heat pumps actually extract the free heat from the air; the sun doesn't need to shine for the heat pump to work!

Today's swimming pool heat pumps can extract free heat from the outside air, even when the external temperature is as low as -15℃. However the standard outdoor pool unit will only need to defrost. So how does a heat pump work? In one word, a heat pump is a refrigerator working in reverse, so the technology is proven and they are noted for their reliability.

In different operation conditions, Swimming Pool heat Pump can absorbs 3 to 6 kilowatt hour heat from low temperature heat source when it consumes 1 kilowatt hour electric energy. Swimming Pool heat Pump is usually made up of compressor, evaporator, expansion valve, filter, fluid reservoir, condenser, water tank, and water pump, etc.

The pool owner doesn't want the trouble of constantly monitoring the heating of his pool so most heat pumps are fully automatic and need but one control ­the pool water thermostat!
Heat Pumps are super efficient with COP (co-efficiency of performance) of up to 5:1, this means you put in one dollar in electricity and the Heat Pump gives you five dollar worth of heat to the pool.

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The advantages of the air source heat pump water heater compared with others

The advantages of the air source heat pump water heater compared with conventional solar products.

1.Air source heat pump water heater is suitable for the temperature range of -10-40 ℃, available every day all year round, not affected by the overcast, rainy, snowy day and other inclement weather and the winter night, can be used normally.
2.Continuous heating, compared with conventional solar storage-type heat pump products can be continuous heating and supply hot water to meet customer needs.
3. Low running costs: compared with conventional solar energy, the operating cost is higher than solar in the spring, summer, autumn sunlight days, but the thermal efficiency is much higher than solar electric auxiliary heating, in the rainy days and nights. Average throughout the year, conventional solar auxiliary systems annual energy consumptions much higher than the total energy consumption of heat pump water heater.
4, easy to install: the host of air source heat pump similar to air conditioning outdoor unit, can be directly connected to the tank or heating pipes, for large-scale central heating, air source heat pump water heater is the best choice.

The advantages of heat pump water heaters compared with the boiler?

1, High thermal efficiency: air source heat pump water heater thermal efficiency more than 300% for annual average, while the thermal efficiency of the boiler does not exceed 100%.2, low operating costs: compared with oil, gas boiler, 70% of the energy for annual average, and increasing fuel prices, low running costs have become increasingly prominent.
3.No combustion emissions, environmental protection.

4. Unattended safe operation: compared to fuel boilers, running absolutely safe, and automatic control, no staff on duty may be savings staff costs.
5. Module installation, easy to add devices, multiple units installation in parallel mode, when the water consumption increases, add equipment at any time.

What are the disadvantages of the heat pump water heater compared with the boiler?

1. More time to heat: air source heat pump take the refrigerant as the medium, the use of compressor compression heating, compared with the boiler direct heating mode, the speed is relatively slow.
2. One-time investment: compared with fuel, gas boiler, when water consumption is greater than 10 tons, one-time investment is greater than the boiler, the more water needed, the more costs to invest.

3.Heating water temperature is limited to: heat pump water temperature at 60 ° C (water source heat pump up to 80 ° C), air source heat pump water heater could not produce more than 80 ℃ high temperature water or steam.

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What is the working principle of air source heat pump water heater?

Take refrigerant as the medium, the refrigerant can be vaporized at -40℃low temperature. Therefore, there is temperature difference with outside air. refrigerant absorbs the temperature from outside air, compressed by compressor heating, turn into the high temperature high-pressure gas, exchange heat via the heat exchanger with water, to release pressure via the expansion valve , back to the low-temperature low-pressure liquefied state, through a continuous cycle of refrigerant.

Does heat pump products need electricity?
There must be electricity used for compressor and fan normal working.

Air source heat pump water heater's characteristics.
1. without environmental impact, available all year round;
2. the energy saving effect is prominent, and the payback period is short;
3. environmentally friendly products, without any pollution;
4. longevity, low operating costs;
5.Run safe, unattended operation;
6. the modular design, easy to install.

More related articles,please visit our website: http://www.fsdetn.com/en/

Air source heat pump water heater: Air source heat pump water heater technology

Air source heat pump water heater: Air source heat pump water heater technology: Air source heat pump water heater technology is based on the principle of reverse Carnot cycle, energy saving, environmentally friend...

The features of all kinds of air source heat pump water heaters







Detian air source heat pump water heater





All kinds of air source heat pump water heaters available now.

1. Instant (one-time heating)

A, that is the definition of instant air source heat pump water heater:
      The so-called direct thermal air source heat pump water heater, water heated by heat pump just one-time can reach setting hot water temperature; the technology is different from the conventional one which need to circulate in the heat pump more times in order to reach the setting temperature.

B, direct thermal heat pump water heater characteristics:
1), the heated water temperature will be same as setting just one time heated. It is comfort and reliable to users. The water temperature will not change during your shower time.

2), long longevity, high efficiency, long life; direct thermal heat pump water heater , heating the cold water instead of warm water; cold water can absorb more heat generated in the heat pump operation, heat pump get sufficient cooling that will not cause the core components of the compressor harsh operating, lead to affect the operating efficiency and longevity, less electrical energy consumed by compressor of air source heat pump water heater, which has overcome the system pressure , that is directly the unique energy-efficient secret of direct thermal heat pump units (EER COP up to 4.5 or more).

2 Cycle type
A  definition of the cycle heat pump: the so-called cycle heat pump, refers to the heated water just enhance the limited temperature (about 5 ° C) each time passed through the heat pump of air source heat pump water heater, must be repetitious cycle can be heated to reach setting temperature; the technology used by the early heat pump, there are still some manufacturers still use it because the product technology renovation costs problems.

B, Cycle heat pump features:
1), thewater heated by passing through the heat pump, heat pump not only as a heat source but also became tool mix the hot with cold water , using the hot water while the water in tank cooling gradually, user will feel very uncomfortable when the water temperature becoming lower and lower.

2), circulating heat pump can improve the water temperature 5℃ each cycle, the heat pump of air source water heater must operate with high temperature for a long time to achieve the setting water temperature. For example, you want to heat water from 15℃  to 55 ℃, the water pass through the heat pump efficiency

3. Instantl cycle air source heat pump water heater
there is two advantages of the direct thermal air source heat pump water heater:
1) to prevent the hot water tank turn into cold
2) defrosting, itis better to defrost use cycle system..

Immersion air source heat pump water heater.
      Also known as static heating heat pump water heater, the water temperature gradually to reach the setting temperature, the air source heat pump water heater heat water directly or indirectly through a heat exchanger.

4. Fluorine cycle air source heat pump water heater and water cycle air source heat pump water heater.

1) According to heat generated different methods, air source heat pump water heaters can be divided into fluoride and water cycles two kinds. The fluorine-cycle heating method is the most primitive way of heating. Simple principle, heat the brass directly in the tank inside, low cost of this heating method, but heat the water in the stationary state, it is easy to fur the brass, so thermal efficiency of air source heat pump water heater will be substantially reduced after a period. More serious is that the brass plate set in the tank scale corrosion perforation, freon leakage in the water into the room, very dangerous. Recent brass plate placed on the surface of the water tank outside air soure heat pump water heater, although there is some heat loss, but very safe, life is also greatly increased the longevity.

2) The water cycle heating method is more popular in the world, there is no brass pipe in the tank, there is tube heat exchanger in main unit. The cold water pumped from tank pass through the tube heated and sent back to water tank, until the water in entire tank to be heated. This heating method of current air souce heat pump water heater, will lead to high cost of equipment, but due to the forced convection of the pump, making the heat transfer efficiency greatly improved, but also avoid the problem of scaling, and cavitation. Safer and longer longevity.

How to distinguish between these two kinds of heating method of air source heat pump water heater? To see a host volume, due to the increased equipment components, the water cycle air source heat pump water heater, looks larger than the fluorine cycle of 1/3; To see host and tank connection materials, fluorine cycle air source heat pump water heater connected with brass the water cycle air souece heat pump water heater connected with water pipes; To see host viscera, open the cover, the water cycle air source heat pump water heater within the host in addition to the components of the necessary equipments, as well as tube heat exchanger, expansion tanks, pumps, more complex structure, the components of fluorine cycle air souce heat pump water heater is very simple in the host device, with no difference with the general air conditioning.

Air source heat pump water heater technology

Air source heat pump water heater technology is based on the principle of reverse Carnot cycle, energy saving, environmentally friendly heating technology. Air source heat pump water heater system obtain the low temperature heat source from air, integrated by the system efficient collectors to become a high-temperature heat source, is used to supply warm or supply hot water, high collection efficiency of the entire system.
Air source heat pump water heater has four major advantages of energy saving, and conducive to the comprehensive utilization of energy, also conducive to environmental protection. The third point is the hot and cold combined, high device application rate, saving investment. Because it is electric driven, so it is more convenient heat pump water heater.

Air source heat pump water heater technology can increase the use of energy efficiency, the use of energy efficiency from two points, from an environmental perspective, we can reduce greenhouse gas emissions, reducing harmful environmental factors; from the other side, is to solve a technology of power overload.

Does Heat pump products belong to solar products?
From the working principle, does not belong to the traditional solar products. There is big difference between air source heat pump water heater and conventional solar products, conventional solar products use water as the medium, rely on direct sunlight or radiation in order to achieve the heating effect. Refrigerant absorbs the heat and solar radiation in the air, and compressed by the compressor to get the heating effect, same working principle as air conditioner.

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How to choose a wonderful heat pump water heater

The composition and function of heat pump water heater
Air source heat pump water heater is composed mainly of two parts: First, air source heat pump main unit, also known outside host machine, and its shape and structure essentially same as the outdoor unit of the air conditioners, mainly composed by the compressor and the evaporator. Heat exchange between Medium and the air by the host machine, media will quickly evaporate vaporization absorbs heat in the air, which is the essence of eletricity saving of heat pump water heater . Second, the tank of heat pump water heater, it’s functions similar to the other type water heater tank, hot water is reserved, but the structure and size is different, there are different length brass hovering in the internal air source heat pump water heater tank, high temperature medium flowing through the copper tube to exchange heat between high temperature working fluid and water in the storage tank.

Meanwhile, heat pump water heater tanks are generally pressurized liner, you can ensure that when the water pressure sufficient to carry out the central heating water. In addition, between the tank shell and the liner is made of high density polyurethane foam for the constant temperature constant pressure quantitative treatment, to ensure good insulation effect, is the best insulation method.

Different power of air source heat pump water heater
Air source heat pump water heater, under the same refrigerant and compressor and configuration and same technology and other related circumstances hosts, the power greater, the heating faster, more efficient and convenient in use. Power consumption will not cause the difference, because the same amount of heat required to heat hot water is same value, the difference is how long to make water hot, of course, the prices of large power machines more highter than the small power. Many friends have mistakenly thought that the machine will result in large power consumption increases, which is a recognition on the small errors.

Applicable specifications of heat pump water heater.
 Everyone’s habit of using hot water is not the same! Some people like to bath water tap has been open all the time, some people click on the red smear soap or shower gel and other toiletries, so that a big diffience. And some people take a bath time is very short, only a few minutes, but some people it is necessary to fully enjoy the fun of bath, time to reach more than 30 minutes. Usually a shower with hot water about 30-40 liters of water, take a hot bubble bath 80-100 liters. Three to four people small household if only take shower, 100 liters water tank capacity is enough to use; five or six people household 150 liters water tank is enought; while the family have a bathtub at least 200 liters of water tanks used to meet, home heat pump storage tank there are 260 l water tank, 320 liters, 400 liters capacity of 500 different upgrades. But in fact we will use water when more than calculated, because there is no washing, laundry and other areas with hot water into account. Modern standard of living has been greatly improved than in the past, and with hot water good for health promotion but also accepted by the majority of people, affect our hot water use from an objective view. If the family’s economic condition is fine, we recommend using bigger water heater. Capacity are mentioned here refers to the actual water tank capacity, to deduct insulation thickness, however, many brands of air source heat pump water tank nominal capacity is not real, the calculation is very simple cylinder volume (area square multiplied by the height).

Technical parameters of heat pump water heater
About the compressor of the air source heat pump water heater, the air source heat pump water heater designed to achieve high efficiency, and stable and durable. Air source heat pump water heaters are generally required to use brand-name compressor, because the key to a good quality compressor core technology in the foreign manufacturers are more well-known manufacturers, quality and service guaranteed. A good quality products it needs is a good composite indicator, we know the composition of the heat pump compressor, a control system, there is the evaporator, a condenser, a water tank, a steel material, a welding process, a sheet metal process , there must be follow-up professional installation and quality service to form a good quality product. If anyone thinks they have a healthy heart is healthy on the identification, it is very ridiculous! In addition to heart because you, you have other body systems and organs; the central nervous system, a brain, a limb, there are facial features, there are internal organs, and bones, etc., any system or organ lesions so that people can not be called healthy.

The water tanks of air source heat pump water heaters

The water tank in air source heat pump water heater is core part,the inner ladder is key technic to water tank water tank is very important to air source heat pump water heater, not only affects the operation of air source heat pump water heater.more important is to determine the longevity of air source heat pump water heater.

Three materials: no one is perfect.
The water tanks of air souce heat pump water heaters, there are three major categories accroding to material and technic: stainless steel inner ladder, enamel inner ladder, crystal inner ladder.

1. Stainless steel liner is a second-generation water tank to replace the galvanized sheet, view the current industry industry conditions, the longest period of time on the market, the most group used, and chosen by most clients. SUS304 stainless steel is the best stainless steel liner material, anti-corrosive, is the choice of most manufacturers.

The biggest technical difficulty of the stainless steel liner is the corrosion and crack problems based on Welding position, the original corrosion resistance will be lost when stainless steel plate welding under high temperature.The stainless steel liner have to bear the working pressure when being used, coupled with the impact of heating expand and cooling contract, leakage is never avoid.Rusting and leakage phenomenon have occurred, serious affect the development of air source heat pump water heater.

2. The enamel interior is the third-generation after stainless steel,its unique advantages: Pressure resistance, strain resistance, acid resistance, alkali resistance, High temperature resistance, water vapor ressitance, non-polluting.

Of course, the enamel liner is not the perfect choice,huge weight,difficult to transfer. Once there is broken enamel. It is difficult to find out, liner ladder rust immediately damage the quality of the water tank.

3. The third type water tank products is crystal interior. Crystal Liner is similar to the enamel interior, which is also called "slush liner. Crystal interior is also in the plate "Boring" on a layer of material. This material similar to the plastic or resin material, and thus be able to successful isolation from the plate and water, to prevent the steel plate rust corroded.

Crystal inner is almost the same performance with enamel interior, but better than enamel interior, lighter than enamel,not so vulnerable, easy to transport and water storage tanks more bigger. At the same time, crystal interior not affected by thermal expansion and contraction of the impact will not lead to crack and leaking, it will not affect the thermal conductivity and water quality due to scaling.

But doubt have never been stopped within the crystal inner material is easy to fall off, and material aging cause water to smell ", technical questions of crystal inner need to be solved and proven.

Although the tank water is so important to air source heat pump water, but the whole market focus on the the development of main unit. Stainless steel, enamel interior crystal liner, there is a long time for their development.

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