Swimming Pools and Ponds
Through our sister Company HeatPumps4Pools, we can offer specialist advice on swimming pool heating solutions and swimming pool equipment
HeatPumps4Pools can offer the widest range of swimming pool heat pumps
HeatPumps4Pools are a specialist in swimming pool heat pumps and pool heating systems.
We can offer advice on the best and most cost effective pool heating system to suit your requirements and budget
At HeatPumps4Pools. we can supply all swimming pool equipment including:-
Using our knowledge of domestic and swimming pool heat pumps, we can design a bespoke solution to suit your particular situation
Please Contact Us for more information
Heat Pumps for Koi Ponds
Working with our sister company HeatPumps4Pools, we can also offer specialist advice on using heat pumps to heat koi ponds.
HeatPumps4Pools supply the excellent Duratech Dura+ heat pumps which work well down to -15c and are particularly well suited to use on koi ponds.
Heat pumps are an excellent way of heating koi ponds through the winter and summer months.
Using a heat pump as a pond heater will significantly reduce your pond heating costs compare with all other forms of pond heating.
Below is a guide to the costs to heat a koi pond using different heating methods. This is an average/guide as the cost of heating a pond will vary according to the time of year and the weather, however this still provides a useful illustration of the savings that using a heat pump can bring.
Maintaining a reasonable pond temperature throughout the winter and spring (eg +12c) can have significant health benefits for the fish, helping to prevent disease and parasite attack
For use with koi ponds, it is important to select a heat pump that can operate down to low temperatures in order to maintain the required temperature of the pond throughout the winter and spring.
Typically a koi pond will be kept at between 10c and 15c throughout the winter and around 20- 22c in the summer.
The range of heat pumps that we recommend for koi ponds are the excellent Duratech Dura+ range. The Duratech Dura+ range come in different sizes of 7kw, 10kw, 14kw, 19kw, 22kw and 30kw of output heat. Beware of other heat pumps that will only work down to about +7c, as these will become inefficient in very cold weather.
Our Duratech Dura+ heat pumps provide the highest output at lower air temperatures compared with other heat pumps on the market.
Whilst there are cheaper heat pumps available on the market, the slight extra cost of the Duratech Dura+ range is worth it in terms of performance, reliability and suitability for use on koi ponds.
A heat pump can be used all year round to provide a stable pond water temperature. A stable water temperature provides siginiicant health benefits for the fish.
Our Duratech Dura+ range can operate down to -15c and have a "hot-gas" defrosting mechanism which will quickly clear away any ice that may form on the heat pump at low temperatures.
For a koi pond that is heated all year round with a winter temperature of around 12c and a summer temperature of around 20-22c, we recommend the following sizing:-
A cover should always be used on the pond in winter to help retain the heat and reduce heat loss (see below for our range of pond winter covers). In addition, any insulation that can be built into the pond walls and floor will be beneficial in reducing heat loss and hence reduce running costs.
Heating a koi pond with a heat pump will always be significantly cheaper than using gas, oil or direct electric heating.
Our Duratech Dura+ heat pumps will return between 2.8 and 6.7 times their input energy as heat depending on the air temperature.
This factor of efficiency is called the COP (Coefficient of Performance) and you can view a graph of how the unit performance varies with air temperature on the Dura+ product page Here
At an air temperature of 0c and water temp of 13c, the Duratech Dura+ heat pumps have a COP of about 4.
ie even at 0c air temperature, they will still output four times their power input as heat. The COP rises to over 6 as the air temperature rises.
This performance exceeds virtually all other heat pumps on the market. The output of other heat pumps will fall to virtually nothing as the air temperature falls. Many other makes of heat pumps that claim to be suitable for koi ponds are in reality only for summer use.
The Duratech Dura+7 has an input power of 1.2kw and therefore with an air temperature of 0c, it will still output 4 x 1.2 = 4.8kw of heat for only 1.2kw of input power.
The COP rises to over 6 meaning that the heat pump can produce 6 x 1.2 = 7.2kw of heat from only 1.2kw of input power.
These heat pumps therefore have an efficiency of between 280% and 670%. A typical gas boiler will only be around 85% efficient and direct electric heating is about 95% efficient.
This high efficiency makes heat pumps the cheapest form of heating for koi ponds, even at low air temperatures.
The Duratech Dura+ heat pumps can be set to keep the water temperature between +7c and +40c and the temperature can be increased in 0.5c increments.
Note that some other heat pumps on the market have a minimum set temperature of +15c which is too warm for most koi ponds in winter. Most koi ponds are kept at around +12c in winter.
The ability to set the desired water temperature to within 0.5c accuracy is another important feature of the Duratech Dura+ units. The temperature of most other heat pumps can only be changed in 1 degree increments.
The controls on the Duratech Dura+ range therefore allow you to have precise control over the pond water temperature.
Heating and Cooling Capability
The Duratech Dura+ heat pumps can heat and cool the pond water.
In summer, if the pond temperature exceeds the desired temperature set on the heat pump (eg 20-22c), the heat pump will then automatically enter cooling mode to reduce the pond temperature.
The accuracy of the controls on the Duratech Dura+ range helps to prevent temperature fluctuations to the pond water temperature to provide a stable water temperature.
Fish Health Benefits
Maintaining your pond at a stable temperature will have significant health benefits for your fish.
Keeping the pond at a reasonable and stable temperature (eg 12c) during the winter and spring months will keep the immune system of the fish active.
This can reduce the risk of the fish contracting diseases and being attacked by parasites, particularly in the Spring.
As an example of running costs, the Dura+ 7kw heat pump has an input power of 1.2kw (5.2 amps).
If your electricity costs say 9p per kwh then the running costs of the heat pump would be 9 x 1.2 = 10.8p per hour while the heat pump is operating
Except in extremely cold spells, and if sized correctly, the heat pump should not need to run 24hrs a day.
The heat pump will heat the pond to the required temperature and will then switch off.
The running time of the unit will depend on the air temperature and how well the pond is insulated or covered.
Assuming the heat pump needs to run for say 7hrs per day, the running cost for a Dura+ 7 unit would be 7 x 10.8p = 75.6p per day
If you have any questions regarding the use of heat pumps to heat koi ponds, please Contact Us and we will be delighted to
The use of the Duratech Dura+ range of heat pumps on koi ponds does not invalidate the warranty in any way.
The only provision in the warranty document states that for koi ponds, the PH must be kept between 7.0 and 8.5 which is fairly typical for most koi ponds.
The concentration of medicinal chemicals that may be used in koi ponds is not sufficient to cause any damage to the unit.
The Dura+ units have a titanium heat exchanger which is highly resistant to corrosion from all chemical types including chlorine in swimming pools.
A copy of the warranty document is listed at the bottom of the Dura+ product listing, or can be viewed Here
Further Advice for Installing Heat Pumps on Koi Ponds
Drip Tray Heating Kit
Below are some photographs of a heat pond being heated through the winter using a Duratech Dura+ heat pump.
Another example below of a Duratech Dura+ heat pump heating a koi pond taken March 2010
The pond owner reported that the heat pump has worked extremely well and maintained the pond temperature at 15c despite the snow !
The running costs were reduced by approx 60%
Another recent installation was on a 14,000 gallon pond in Norfolk and used a Duratech Dura+14kw unit to heat the pool.
The pool owner reported:-
"I am writing to say I have been very impressed with the heat pump, I reckon over the past 3 weeks it has already saved me over £200 in heating oil"
The initial purchase cost of a heat pump may be higher than a traditional electric or gas pond heater, but you will soon recover the outlay through greatly reduced running costs.
Using a heat pump to heat your pond is also a more environmentally friendly method than using fossil fuels such as gas or oil and so you can also reduce CO2 emissions and do your bit for the environment !
You can see an excellent account of how another of our customers installed one of our heat pumps on their koi pond
What our customers say
Here are some quotes from our customers that are using Duratech Dura+ heat pumps on their koi ponds:-
On the example below the pipes from the pond to the heat pump were run underground in flexible pipe
Bypass kit and solid to flexible pipe connection shown
Pond Winter Covers
Note that we also sell an excellent range of winter covers specifically designed for koi ponds
Click Here for more details on the pond winter coversanswer them for you.