What is an air source heat pump?

Heat pumps use the same technology as fridges or air-conditioning units, but instead of taking heat out of the house, they extracts heat from the outside air and uses it to heat your home and water. A very efficient way of heating a home, heat pumps require just 1kW of electrical input in order to generate 3kW to 5kW of heating output. This means they are 3 to 5 times more efficient than fossil fuel boilers. And they can warm a house effectively even during the coldest weather.

Are there grants available to help me install an air source heat pump system?

Yes. In June 2011, the Government is launching the Renewable Heat Incentive (RHI), a new scheme to support the generation of heat from renewable sources. Under the RHI, you will receive regular payments over the whole lifetime of your air source system, based on the (estimated, or “deemed”) amount of heat produced. The government will announce details about payment rates soon. There are also grants and discounts to help with energy efficiency measures. The Energy Saving Trust has a simple questionnaire here that will tell you what schemes you are eligible for.

Can an air source heat pump work without a backup heater?

No. The backup heater is necessary so that water temperature never drops below 15°C during start up of the system or for extra heat during a defrost cycle.

Can an air source heat pump heat water during the summer?

Yes. It will heat water even when outside temperatures reach as high as 35°c. If temperatures rise above 35°c, water can still be heated using the pump’s electric booster heater.

Can radiators be heated by an air source heat pump system even though the temperature is limited at 55°C?

Yes. And many existing older, larger types of radiator will work well with the system. However, smaller radiators may have to be replaced to deliver the required room temperatures.

Can I use programmable timers individual room thermostats with an air source hear pump system?

Certainly. The system can read messages that tell it when a room requires heating or cooling.

If the pump only heats water to 55°C, how do I get hotter water from my taps?

The pump has an electric booster heater that can heat your water temperature from 55°c to a maximum of 80°c. A temperature of 55°c though is more than warm enough for a bath.

Is it possible to combine an air source heat pump with a solar thermal hot water system?

Absolutely. Ace Energy offers a solar connection kit that allows you to do just this.

What does backup heater do?

This is an electric emersion heater that helps the heat pump when it is severely cold. It switches on automatically when the heat pump cannot reach the required water temperature on its own.

What is the warranty for the system?

This varies between 2 and 5 years according to which manufacturer is used.

What is the heat pump’s lowest operational temperature?

Typically between -15 and – 20 degrees centigrade.

What is the maximum water temperature produced by the heat pump?


What is the maximum water temperature produced by the backup heater?