Air Source Heat Pumps

An Air Source Heat Pump is an efficient and environmentally friendly way of heating your home or workplace using air drawn from the atmosphere. It works in a similar way to your fridge where heat is removed from food and released to atmosphere through the metal coils on the back of the fridge. An Air Source Heat Pump reverses this process by removing heat from the outside atmosphere and releasing to your hot water and heating system inside. It can be used to provide heat for underfloor heating, radiators and warm air convectors, and it will supply all of your hot water requirements.

The great advantage of a heat pump is that for every unit of electrical energy you pay for, free environmental heat units are generated, making it exceptionally efficient. For example, a typical air source heat pump will use 1kw of grid electricity which will generate 1kw of heat but in addition, it will also generate 2kw of free environmental heat thus giving an efficiency rating of 1:3 or 300%. Compare this to a traditional gas or oil system with standard efficiencies of no more than 90%. With a projected life span of between 15 and 20 years, your Air Source Heat pump will future proof against rising fuel prices as renewable energy units will always remain FOC.

At TUS we offer a comprehensive range of air source heat pump products from industry leading manufacturers Stiebel Eltron and Hitachi.

For a FREE heat pump quotation or consultation call our sales team on 01283 850045 or click here to email us


RHI is a government run incentive scheme designed to encourage the take up of renewable energy by paying owners of eligible technologies for the renewable heat generated. In the case of domestic owners, payments are made over 7 years whilst commercial owners receive payments over 20 years. RHI is index linked to inflation.

For Domestic customers, there are two further qualifying criteria to gain acceptance onto the RHI scheme. Firstly, your property must have a compliant green deal assessment attesting to minimum insulation levels required within your property and secondly, you must have a valid MCS certificate. MCS certificates can only be issued by accredited installers or installers operating under an MCS accredited umbrella scheme. The Underfloor Superstore is completely flexible in that we operate an MCS umbrella scheme allowing your chosen installer to do the work or we can recommend from our network of accredited installers.

Financial Benefit – Working Example

Mr X has renovated a barn and insulated the building up to current building regs. He had a Green Deal Assessment carried out indicating a heat load figure of 11,500kwh covering heating and hot water.
The cost of installing a 12kw Air Source Heat Pump and underfloor heating is £12,800 compared to around £7,000 for an oil heated system. (Diff = £5,800)
Mr X will save around £266 per year against the oil system. He will also receive £637 per year in RHI payments for 7 years. With total annual benefit of £903, the recovery period to reach parity with Oil system is £5,800 / £903 = 6.42 years. Thereafter, Mr X is £266 / year better off for the remaining life of the unit.

An air source heat pump will require extra investment in the short term, which you will recover in the medium term through cheap energy bills and RHI income. Over the longer term, on-going lower running costs will deliver a significant return on your investment, especially when substituting fuel sources such as solid fuel, oil, LPG or direct electric.


Primary fuel for air source heat pump is the freely available atmospheric air. Depending on the fuel being substituted, carbon emission savings can be as high as 3.6 to 10.5 tonnes per year.

An Air Source Heat Pump is a “fit and forget” technology which doesn’t require you to interact with it in any way once installed.
Service and maintenance is minimal as there is no on-site combustion. Often, all that is required is a bi-annual check primarily to ensure there are no obstructions (leaves, debris ) to hinder fan performance.


There are a few basic qualifying answers to the questions you should ask yourself when considering whether a heat pump will work for you and your property.
If you find yourself ticking these boxes and wish to speak to one of our team about your specific project, don’t hesitate to get in touch.

√ - Apart from ASHP, my only other fuel options  are Oil, LPG, Direct Electric, Solid fuel
√ -I will be using low temp heating ( underfloor heating, oversized rads )
√ -I can add more radiators if necessary to reduce system flow temperatures.
√ -My property is either well insulated or can be improved
√ -I have got room enough to site outdoor unit ( at least 5m away from neighbour )
√ -I have got room to site a domestic hot water tank and maybe a heating buffer tank
√ -I want to save money and future proof my property against rises in energy costs.


Q - Do heat pumps need a back up boiler? Can they provide all heating and hot water without it?

A – Heat pumps don’t need a back up boiler when they are designed to cover full heating load. However, heat pumps and boilers can work together in situations when it is cheaper to run the heat pump to one set temperature and the boiler to another. For example, a retro-fit situation where existing infrastructure can’t be changed, the heat pump will operate as lead heater for the majority of the time, only switching to boiler on the coldest days.

Q – Do you need a lot of land?

A – Not such a problem with Air Source Heat Pumps, however, there are still regulations that govern their siting which we are happy to assist you with.

Q – Are heat pumps any good at heating Domestic Hot Water to higher temperature?

A - Typically, heat pumps will heat domestic hot water to a temperature of around 50 to 55°C which is perfectly adequate for system users who will experience a mixed down tap temperature of 41-43°C. The only consequence of a lower domestic hot water temperature is the requirement to run a  periodic legionella cycle whereby cylinder immersion heater is energised once every few days to lift the temperature to 60°C and hold for an hour.