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Engineered in Germany STIEBEL ELTRON have been providing highly efficient appliances for heating, hot water and cooling for over 40 years.

High quality heat pumps with expert support

Comfort through heat pump technology

You can rely on your heat pump to supply the home comforts of hot water and a feel-good room temperature.


The benefits of Stiebel Eltron heat pumps

  • High quality German engineering from a company who have more than thirty years of heat pump manufacturing experience.
  • High efficiency of all models ensures best return on investment.
  • Designed to provide very high flow temperatures down to an external temperature of -20ºC degrees. This means it will keep on working even in the very coldest of weather when poor quality heat pumps can struggle
  • All Stiebel Eltron heat pumps can be fitted with remote monitoring that can alert you or your service engineer if there is a fault. Never come from holiday to a cold home again!
  • 7 year extended warranty available through our recommended partners
  • Free of charge site surveys to ensure the most appropriate choice of technologies and provide a detailed specification
  • We can provide you with latest information on government incentives to help you maximise your return on investment

Air source heat pump – for utilising outdoor air

  • High temperature fluctuations throughout the year (-18 °C to +30 °C)
  • Lowest heating output at extremely low outside temperatures
  • Lowest COP at low outside temperatures
  • Defrosting of evaporator at outside temperatures of -10 °C to +7 °C
  • Lower seasonal performance factor compared with brine | water and water | water heat pumps
  • Easy installation of the heat pump – no groundworks required
  • No requirements relating to the size of the installation site
  • No official approval required


How heat pumps work


There are two principle locations in the transfer of heat; the place where heat is absorbed, (the source), and to where it is transferred, (the destination).

The mechanical refrigeration cycle consists of an arrangement of heat exchangers in a loop. One side the loop is set to stay colder than the ambient temperature and contains an exchanger that absorbs heat. This heat is then transferred to the hot side of the loop where it is then used to heat your home and hot water.

In order to absorb and release the heat into and from the refrigerant, the system exploits the ability of the refrigerant fluid to boil from a liquid to a vapour and then to condense back into a liquid. This is a continual process while the compressor is running and circulating the refrigerant.

The cold side of the loop is where heat from the environment is collected. First the refrigerant gas is expanded and then evaporated exploiting two principles:

  1. a gas cools down when it expands (blow on the back of your hand to test it!)
  2. evaporation from a liquid to a gas robs takes heat from the environment (lick the back of your hand and feel it cool as your saliva evaporates)

Similarly, on the hot side, the two opposite principles are exploited:

  1. A gas heats up when it is compressed (so the warmed gas transferred from the cold side is made even hotter). You can feel this at the end of a bicycle pump as you pump up a tyre.
  2. Condensing a gas back into a liquid returns the heat gained during evaporation plus the extra heat gained during compression allowing water to be heated to high temperatures for hot water and heating systems.


Although some heat pumps are configured for heating only, in others it is possible to alter the direction of refrigerant flow within the system so that the system is able to deliver both heating and cooling as desired.


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