Solar water heating systems use solar panels, called collectors, fitted to your roof. These collect heat from the sun and use it to heat up water which is stored in a hot water cylinder. A boiler or immersion heater can be used as a back up to heat the water further to reach the required temperature.

Suitable for:

  • New builds

  • Retrofit projects

  • Domestic or commercial properties

  • Buildings with high hot water demand

Technical information

Solar water heating systems use solar panels, called collectors, fitted to your roof. These collect heat from the sun and use it to heat up water which is stored in a hot water cylinder. A boiler or immersion heater can be used as a back up to heat the water further to reach the required temperature.

There are two types of solar water heating panels. They are evacuated tubes and flat plate collectors, which can be fixed on the roof tiles or integrated into the roof (flat plate only).

Most conventional boiler and twin coil hot water cylinder systems are compatible with solar water heating. But if your boiler is a combination boiler (combi) and you do not currently have a hot water tank, you would need to install a twin coil cylinder.

The two coil systems are designed to transfer heat from an independent heating source, (e.g. transferring heat from a central heating boiler or solid fuel boiler to the water in the solar cylinder) and the solar coil, which is manufactured from high efficiency tube with a large surface area, to transfer heat from the solar panels into the solar hot water cylinder.



Hints & Tips

  • Be sure to use a twin coil cylinder with a solar thermal system (in conjunction with a boiler).
  • Please speak to us about a full design for your solar and heating requirement.
  • The roof should ideally face due south at a pitched angle between 30° and 50° to give the best overall performance. Installations facing anywhere to the south of due east and due west will work, although the output will be reduced.
  • Ensure that the floor joists can support the additional weight of the twin coil cylinder. A 300ltr cylinder will typically weigh 400kg when full.
  • The Government’s Renewable Heat Incentive (RHI) scheme makes solar water heating grants available for homeowners from Spring 2014. Planning permission has also eased for solar panels.
  • Make sure the solar panels are not overshadowed by a dormer or trees as this will reduce the output.