Question: what is meant by batteries that can store heat in your house ?

Emily Goddard answered on 9 Mar 2020:

We call it a heat battery, because because just like a ‘normal’ battery stores electricity, the product Sunamp makes stores heat.

It’s basically a box that contains a salt which stores heat until you want to release it. Do you have a hot water tank in your house? The heat batteries work in a very similar way, so you ‘charge’ it by heating it up, and then when you want the energy back, you can use it to heat your water or your radiators. It’s much better than a hot water tank though, you can store about three times as much energy in the same space!