Seilar High Temperature Heat Pump

Seilar heat pumps are amongst the most energy efficient available without compromising on the heating performance. Available in a wide range of sizes and models to suit most pools and budgets.

Seilar heat pumps use the same principle as reverse cycle air conditioners. They extract heat from the air (even down to sub zero temperatures) and, through a series of compression and transference technology, heat the pool water. They work in almost any temperature, with some catering to sub zero temperatures, as well as indoor installations.

The great benefit of this technology is the low running cost. In a side-by-side comparison, a heat pump will cost around 60% less to run than a gas heater, making pumps perfect for anyone who wants to have their pool available 24/7, 365 days a year.


Our heat pumps work similar to reverse cycle air conditioners. They extract ambient heat from the air outside the unit to the pool water stored inside the heater through a heat exchanger system.

The external air is drawn into the heater via a fan into an evaporator containing a special type of refrigerant, which is stored in piping. The refrigerant Seilar uses is called R417a, which isn’t a CFC, so it doesn’t negatively affect the earth’s ozone layer.

The air that has been drawn into the system, turns the refrigerant from a liquid into a gas inside the heat pump’s piping. The gaseous refrigerant is then compressed through a series of tubes within the heat pump; a process which generates a great deal of heat. A heat exchanger then transfers the heat from the heated refrigerant gas pipes to a tank where water is stored.

One of the heat pumps key advantages over solar systems, is that they still work in cold or overcast conditions with some models available to cater even for sub zero temperatures, as well as indoor installations. The other great benefit of this technology is the relatively low running cost. When used in conjunction with a solar blanket a small heat pump can cost as little as a few dollars per day to run. They are considerable cheaper to run than gas heaters and don’t require the sun to be shining to generate heat, making them the perfect solution for anyone that wants to use their pool for more than a few months of the year.


The key performance measure used to compare heat pumps is something called COP (co-efficient of performance), a heating efficiency measure. In simple terms, the COP describes how much energy it takes to produce a certain amount of heat. The higher the COP, the more efficient the heater is at generating heat.

For example, say a heater uses 2kW of electricity to deliver 10kW of heat into the pool, the COP is 5.0 (2kW used ÷ 10kW delivered = COP 5). Any COP around 5 in real world conditions is considered the benchmark.

When making brand comparisons it is important to ensure that you are comparing apples with apples. Some companies overinflate their performance by measuring the COP under favourable conditions (ie. higher air temperatures). COP should be measured when the outside temperature is low, which is exactly when you need the best from your heat pump. COP reported for all Seilar heat pumps and most of the other leading manufacturers is determined when the temperature is around 15°C.