DC inverter water to air heat pump
Features Technical Parameters Working principle

Product Description:

DAISHIBA DC Inverter Water to Air utilizes free renewable energy from ground or ground water. The units are highly efficient with low running costs, low carbon emission. Thanks for the advanced DC inverter technology adopted, the units are with higher efficiency and save great amount of energy. The units provide independent cool or heat air to home. As each unit is independent, user can select cooling or heating mode as their wishes. Compared to the traditional central air conditioning system, it is more flexible and energy saving. 

Product Features 

  • Super high efficient, its COP reaches 5.0 
  • Super thin design, the unit needs smaller installation space 
  • Easy installation and easy maintenance 
  • Electric expansion valve keeps the most suitable refrigerant flow in any case 
  • Full protection functions keep the system safety, such as water flow protection, high / low pressure protection, over heating, etc. 
  • Static pressure valve built-in 
  • Microprocessor control, self diagnosis and error 
  • Air conditioner with R410A gas


Q1: Are you a factory or trading company?
A: We are the factory, and especially R&D, manufacturer and sell various heat pump euipment. We have engaged in the heat pump R&D and production over 10 years.

Q2: How to find a heat pump suitable for my product?
A: a. Tell us about your product details;

b. What functional heat pump products do you need;

c. Tell us your local minimum ambient temperature and maximum ambient temperature to recommend products that meet your needs;
d. Power supply specifications and special requirements used in your country. 

Q3: Is engineer available to serve oversea?
A: Yes, but the travel fee is paid by you. So actually to save your cost, We provide installation instructions and 24-hour online service and assist you till the end.

Q4: What is the payment term?

A: 30% T/T deposit and 70% T/T balance payment before shipping (If you purchase a sample that requires 100% payment, In order to avoid second payment, bank deduction fees will be generated again). Online trade assurance order, L/C, or as negotiated terms with clients.


Q5: How long is the warranty time?
A: 1 years of warranty. In guarantee period, if spare part broken, we will send you the parts free and we will pay the express fee. And please send us the spare parts back. when machine is out of guarantee period, we will provide you the spare parts by charge.

Q6: How can we make sure about the machine quality after we put the order?
A: Before delivery, we will send you the pictures for you to check the quality, and also you can arrange for quality checking by yourself or by your contacts in China.

Q7: We are afraid you won't send us the machine after we send you the money?
A: Please note our above business license and certificate. And if you don't trust us, then we can use Alibaba trade assurance service, guarantee your money, and guarantee your machine's on-time delivery and machine quality..

Q8: Why we should choose your company?
A: We are a professional heat pump manufacturer over 10 years, and we provide better after-sales service. We guarantee no risk for our deal.

Usage area m3 20~30 30~45 45~60 60~75 75~90
Heating Nominal capacity kW 4.3 (1.0~4.3) 6 (1.4~6.2) 7.8 (2.0~8.6) 9.5(2.2~10.4) 11.5(2.6~12)
Power input kW 1.12(0.3~1.4) 1.63(0.4~2) 2.2(0.6~2.7) 2.65(0.7~3.0) 3.1(0.8~3.5)
COP W/W 3.84 3.68 3.55 3.58 3.71
Cooling Nominal capacity kW 4.1(1.1~4.5) 6.2(1.5~6.4) 8.32(2.2~9.0) 10.1(2.3~11) 11.7(2.6~12.2)
Power input kW 1.12(0.3~1.4) 1.62(2.0~4.2)) 2.3(0.6~2.7) 2.7(0.7~3.0) 3.1(0.8~3.5)
EER W/W 3.66 3.83 3.61 3.74 3.77
Power supply V/Ph/Hz 220-240V/1Ph/50Hz
Refrigerant type / R410A
Compressor type / Rotary (DC Inverter)
Water source side Heat-exchanger / Tube Heat Exchanger
Water flow m3/h 0.85 1.22 1.4 1.8 2.38
Water inlet/
outlet Diameter
inch 3/4 3/4 1 1 1
User side Heat-exchanger / Fin Tube Heat Exchanger
Air flow m3/h 850 930 1600 1600 1900
Static pressure pa 100 120 150 150 160
Permissible refrigerant pressure suction/ discharge Mpa 1.2/4.15 1.2/4.15 1.2/4.15 1.2/4.15 1.2/4.15
Dimensions(Net) mm 1130*450*360 1130*450*360 1430*450*460 1430*560*460 1430*560*460
Net/Gross weight kg 63/73 65/75 98/118 102/122 115/135
Noise level dB(A) 42 45 47 47 54
Capacities and power inputs based on the follwing conditions:
-Cooling: Water inlet/outlet temperature 30℃/ 35℃, entering air temperature 27℃ DB, 19℃ WB
-Heating: Water inlet temperature 20℃, entering air temperature 20℃ DB, 15℃ WB.
The flow rate obtained during the test at standard rating conditions in cooling mode is used.

How does a heat pump work?

Heat pump uses electrical energy and take low grade heat energy from the outdoor air to heat refrigerant which in turn heats water for domestic use and space heating. The efficiency of a heat pump is known as the coefficient of performance or COP. This is a ration of the heat delivered to power consumed.

At the beginning of the first phase the refrigerant is cold low pressure liquid.

1. The refrigerant passes into the evaporator and heat energy from the outside air passes over the evaporator causing the refrigerant to increase in pressure and change to warm vapor.

2. This warm vapor then enters the compressor as it passed across one side of a plate heat exchanger, and this is transferred via the pimary water circuit to heat up the water tank.

3. The hot refrigerant gas is the temperature, the cool vapor still has a high pressure and to reduce this pressure the vapor passes through an expansion valve. This cause the pressure to drop and the temperature lowers, returning the refrigerant to its initial state of cool low pressure liquid.

This process is repeated.

It is only the refrigerant that passes through this cycle; the water is heated as it travels tthrough the plate heat exchanger. The heat energy from the refrigerant passes through the plate heat exchanger to the cooler water which increase in temperature. This heated water enters the home heating circuit and also be used to provide domestic hot water via a hot water tank.