Duratech Dura+ Air Source Heat Pumps

Duratech Dura+ Air Source Heat Pumps

The most economical way to heat a koi pond. We only supply the best air source heat pumps available.
Stock Status : In Stock
Product Brand : Duratech

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Introducing the New Duratech Plus Heat Pump range of high quality, high specification, heat pumps.
Duratech Plus Heat Pumps can save you up to 80% in operating costs.

Highly efficient and economical

In today’s ever increasing energy costs using a Duratech Plus Heat Pump as a koi pond heater is the cheapest and most energy efficient way of koi pond heating and will substantially reduce your running costs.

Duratech Plus Heat Pumps as koi pond heaters are an environmentally friendly way of heating your koi pond reducing CO2 emissions.     
Most heat pumps are designed for summer use and only work down to about +7c. This can be where the confusion can arise. For koi ponds, it is important to use a unit that can operate down to lower temps, which is why this range should be your first choice.

The Duratech Plus Heat Pump achieves this by using a more efficient refrigerant gas and construction and has a hot gas defrost mechanism.

The energy is collected from the air outside and transferred to the pool water.

For each kW consumed by the Duratech Dura Plus Heat Pumps, 4 to 6 kW are returned to the koi pond. The Duratech Dura Plus Heat Pumps can pay for itself in just a few years with the operation costs savings alone.


The Duratech Plus Heat Pumps must be installed outside. It will heat your pond all year if you want and will even work efficiently with outside temperatures as low as -15°C with the Duratech Dura Plus Heat Pumps range.

The Duratech Dura Plus Heat Pumps have an extra feature a cooling mode, which allows the water to be cooled down by the Duratech Dura Plus Heat Pumps as well.


Duratech 7 Plus Heat Pump are less harmful to the environment because 80% of the energy produced is collected from the outside air and therefore purely natural.

Also the gas used, R410a (DURA+) R407C (DURA), has no harmful effect on the ozone layer. The DURA heat pumps are very energy efficient, our DURA+ range even reach a COP value of 6.

Constructed for durability and longevity
Using advanced and high quality materials like PVC, stainless steel and titanium for the heat exchanger means it is resistant to corrosion through chlorine or salt. The heat exchanger is oversized to improve efficiency.

Easy installation and Advanced control
The unit is intelligently designed and remarkably compact for easy installation. The integrated microprocessor monitors all the sensors and controls the device without any intervention of the user. Electronic display and control with easy operation is standard. The integrated flow switch will sense the water flow and automatically start the heater when the pool pump starts and stops when the pump shuts off.

Running quietly
The use of a highly efficient, low sound rotary or scroll compressor, a low noise fan and an oversized heat exchanger, makes the unit to be extremely quiet in operation. Example: the DURA 10 + gives only 51db(A).

2 years warranty on parts and labour on all components. 

How does it work?

The Duratech Plus Heat Pumps utilise the sun’s free heat by collecting and absorbing energy from the outside air. This energy is then transferred to the koi pond water. Your existing koi pond pump circulates the water through the heater and warms the pond. The unit contains a fan that draws in outside air and directs it over the surface of the EVAPORATOR (energy collector).

The liquid refrigerant within the EVAPORATOR coil absorbs the heat from the outside air and the refrigerant becomes a gas. The warm gas passes through the compressor where it is compressed to form a very hot gas, which then passes through the CONDENSOR (water heat exchanger). It is here that the heat exchange occurs as the hot gas gives up the heat to the cooler koi pond water circulating through the coil. The pond water becomes warmer and the hot gas is cooling down as it flows through the CONDENSOR coil, returns to its liquid form and, after passing through the expansion valve, the whole process begins again.


DURA 10+

DURA 14+ DURA 19+ DURA 22+T DURA 30+T
Heating capacity (KW) 7 9.8 14.3 19.6 22 30

Heating output (BTU)

23900 33450 48500 75000 66500 102000

Power input (KW)

1.2 1.71 2.46 3.44 3.67 5.00

Max Pond volume (m³/gallons)

21.8 / 4800 30.9 / 6800 44.5 / 9800 62.7 / 13800 70.5 / 15500 94.5 / 20800

Running current (Amps)

5.22 7.43 10.70 14.96 6.10 8.30

Maximum current (Amps)

6.5 9.30 13.40 18.70 7.10 9.50

COP at A25/W25

5.8 5.7 5.8 5.7 6.0 6.0

COP at A15/W25

5.3 5.25 5.3 5.25 5.5 5.5

Power supply (V/Ph/Hz)

220-240/1/50 220-240/1/50 220-240/1/50 220-240/1/50 380/3/50 380/3/50




Titanium heat exchanger

Compressor quantity

1 1 1 1 1 1

Compressor type

Rotary Rotary Rotary Scroll Scroll Scroll


R410a R410a R410a R410a R410a R410a

Air flow high (m³/h)

2100 2100 2300 3200 4500 4500

Air flow low (m³/h)

1800 1800 2000 2700 3800 3800

Fan quantity

1 1 1 1 1 1

Fan power input (W)

120 120 120 120 215 215

Fan speed (RPM)

850/750 850/750 850/750 850/750 820/680 820/680

Fan direction

horizontal horizontal horizontal horizontal vertical vertical

Noise level (dB(A)

50 51 51 54 57 57

Water connection (mm)

50 50 50 50 50 50

Nominal water flow (m³/h)

3.0 3.0 4.5 6.0 14.00 19.00

Maximum pressure loss (kPa)

10 10 10 10 16 17

Nett dimensions (L/B/H mm)

905/420/650 905/420/650 905/420/650 1200/470/850 660/660/960 660/660/960

Shipping dimensions (L/B/H mm)

1030/440/700 1030/440/700 1030/440/700 1240/480/900 700/740/1110 700/740/1110

Net weight/shipping weight (Kg)

55/60 60/65 77/82 117/128 112/122 123/133

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