Heat Batteries

What are the benefits of heat batteries?

  • Make the most of renewable energy
  • Increased efficiency
  • Efficient energy storage
  • Space-saving design
  • Compliments electric heating and ASHP
  • Reduce your carbon footprint
  • Make the most of off-peak energy


To compliment your renewable energy system and to work alongside electric heating, we can install heat batteries in your home and business. Heat batteries store either spare heat or electricity, often generated by renewable energy systems.

They are based on latent heat storage; heat or electrical energy is used to change a phase change material (PCM) from one phase to the other (in other words solid to liquid) and this captures the energy. When you need to extract the heat it does this by doing the reverse process (in other words liquid to solid) with a release of heat which can then be used to heat water for you to use in the home.

Space-saving efficient hot water

This is a relatively new technology for home heat storage. They can be used to store heat from a range of different sources to supply hot water and space heating. Heat batteries take up less space than a hot water tank and can store heat for longer.

Heat batteries are generally smaller and lighter than filled thermal stores. This means you might be able to install one in a convenient location even if you can’t find space for a traditional hot water cylinder. Heat storage batteries do not degrade in the same way as electrical batteries and should have a far longer lifespan.

Maintenance and lifespan of heat batteries

Heat batteries require minimal maintenance due to their lack of mechanical parts. However, it is worth getting a professional to check the equipment periodically. Heat batteries have a lifespan of over 40.000 cycles, which is the equivalent of over 40 years of use – so once installed you shouldn’t have to worry about replacing for a very long time!

Useful links

Here are some great information sources and resources if you would like to find out more about Heat Batteries.