Although using an air source heat pump underfloor heating system is possible there are limitations that should be aware of when planning to use this system.
We would recommend that the heating pipe is laid at 100mm spacing rather than the normal 200mm spacing this because the heat generated is lower a temperature than other traditional heat sources around 35 – 55 degrees Celsius which is inefficient to radiate enough heat, therefore, this requires the heated water pipes to be placed closes together. Although the cost of using extra pipe will be greater the ongoing efficiency will be greatly increased when using an air source heat pump underfloor heating system.
Different from ground source heat pump an air source heat pump extracts heat from the outside air in the same way that a fridge extracts heat from its inside. It can get heat from the air even when the temperature is as low as -15° C.
There are two main types of air source heat pumps – air to water and air to heat. As the name suggests one heats water and the other heats the air. An ASHP works a bit like a refrigerator in reverse. The process consists of an evaporator, a compressor and a condenser. The ASHP absorbs heat from the outside air into a liquid at a low temperature, then the heat pump compressor increases the temperature of that heat. In the condenser, the hot liquid’s heat is transferred to your heating and hot-water circuits. So you can use it to heat up your home. Air to water heat pumps take heat from the outside air and feed it into your water central heating system. A lot of the systems also qualify for the Renewable Heat Incentive which could see you get a potential grant for using this type of system. Air to water heat pumps is probably best suited to new-build properties. It could cost less if the heat pump is included as part of the building specification at the planning and build stage rather than having to retrofit underfloor heating later on. Air-to-air heat pumps take heat from the outside air and feed it into your home through fans. This type of system cannot produce hot water.