Air Source Heat Pumps - ASHP Heating

Samsung EHS Air Source Heat Pump House Diagram

How Do they Work?

What is a Heat Pump? The best way to understand how a heat pump works is to remember that temperature and the concept of hot or cold is subjective. With the coldest possible temperature being absolute zero at -273°C, your average fridge at 5°C could be perceived as hot! Heat is energy, the more intense the energy the higher the temperature produced. What air source heat pumps do is absorb energy from the outside air and intensify it to increase its temperature. The hot water produced is then used to heat radiators, underfloor heating systems and hot water cylinders in your property.  It can extract and intensify the heat from the air outside even when the temperature is as low as -20°C. 


An ASHP heating system will still have some impact on the environment as they need electricity to run, but heat pumps can produce up to 5kWh of heat for every 1kWh of electricity used to extract it, a ratio of 5:1. And remember the heat they extract from the air is constantly being renewed naturally, so if coupled with a Solar Photovoltaic array to account for the electricity used it is possible to have a Carbon Neutral heated property.


Air Source Heat Pump Running Costs

Running Costs

Heat pumps provide the best savings when compared to heating systems which use electricity, oil, coal or transported gas, with average savings of over 40%.


When compared to a properly installed, well maintained high efficiency mains gas based heating system, the savings are in the region of 10-15%, more so if the property has Solar PV installed. However, heat pumps offer some distinct advantages over gas:

  • They are extremely reliable and have an expected life span of 25 years with no loss of efficiency, 
  • Gas prices are more susceptible to seasonal price increases than electricity and we expect future gas prices to significantly increase over electricity as supplies run short.
  • No risk of gas explosions or carbon monoxide poisoning, ideal for landlords.

Dimplex LA 12 MI Air Source Heat Pump

The Renewable Heat Incentive (RHI)

The Renewable Heat Incentive is a government backed scheme which provides a set payment for every kilowatt hour (unit) of renewable heat required to heat and provide hot water into a property. In most cases this is deemed from an Energy Performance Certificate, but under specific circumstances it is metered.


Once the system is installed and registered  payments are made quarterly over a period of seven years. On average the RHI will pay for the cost of the installation and support some of the running costs.

ASHP Manufacturers

Samsung EHS

Samsung EHS Air Source Heat Pump Range 5kw / 9kw / 12kw / 16kw models

Samsung EHS is an all-in-one system with highly efficient heat pump technology that keeps your house at a comfortable temperature and your heating costs low all year round. It is compact, quiet and energy efficient with simple to use controls, inverter technology, weather compensation and many other unique features. It represents excellent value for money. More:

Mitsubishi Ecodan

Mitsubishi Ecodan Air Source Heat Pump Range 5KW / 8.5KW / 11.2KW / 14KW

Mitsubishi Electric is a pioneer in the development of heat pump technology that has been used around the world for decades, and has advanced this technology to produce Ecodan. One of the most advanced, efficient heating systems available. Mitsubishi Electric’s award winning Ecodan provides a simple, renewable solution that rivals traditional heating systems. More: