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Published: 26/11/2019

Will a Heat Pump Provide Enough Hot Water for Baths, Showers and Domestic Purposes?


The basics…..

With the correct design and equipment, all domestic hot water requirements would be met by the air source or ground source heat pump throughout the year, on varying sized properties.  Although Heat pumps produce water at lower temperatures than conventional boiler systems.  Instead of water that may be scalding, and hence possibly dangerous, water produced by a Heat Pump is hot enough for normal domestic requirements.  The aim with renewable heating solutions is to save money and energy with either an air source or ground source system.

How it works ……….

Heat pump systems use the ambient temperature of either the air or ground to provide domestic heating and hot water.  Air source heat pumps absorb low temperature heat from the air into a refrigerant fluid.  This fluid then runs through a compressor, which increases its temperature.  The heated fluid runs in a coil through water that is used in the heating and hot water circuits in your home.  Ground source heat pumps work in a very similar manner but instead, they absorb heat from the ground through fluid-containing loops that are buried either horizontally or vertically in bore holes, depending on the space you have available.

Once the water is heated by the heat pump systems it is stored in a tank ready for use.  This tank needs to be well insulated to prevent heat loss.  With a conventional boiler, domestic hot water is usually stored at 60-65°C, however heat pumps can normally only heat water to about 45-50°C, so it is also likely that occasional temperature boost will be needed.  The water tank used with ground and air source heat pumps will usually contain a heating element.

The maximum temperature of the hot water depends on a number of factors, such as the type of refrigerant used in the heat pump, the size of the coil in the hot water tank, the usage, etc.  Changing the refrigerant can cause the heat pump to operate at higher temperatures and heat water up to 65°C, however heat pump systems are less efficient at higher temperatures.  The size of the coil within the tank is very important: if the coil is too small, hot water will not reach the required temperature.  When using a heat source or ground source heat pump it’s necessary to have a very large heat-exchanger coil.

Benefits ………

Why opt for a Heat Pump?

  • Renewable energy is the greener option, reduce your own carbon footprint
  • RHI government incentive available.
  • Safety – no scalding water supply and HP’s eliminate the Carbon Dioxide risk.
  • Air source heat pumps are quick and easy to install with very little disruption to your home.


If you are interested in Heat Pumps and keen to learn more  An introduction to Heat Pumps

or contact our HP sales department on 01303 248648.


Why not take a look at our comprehensive guide to heat pumps to find our more info.