Here in Spain what we have is called an 'acumulador' which we translated as an accumulator. From what has been written, it looks like what we have is a large hot water cylinder which stores enough water to enable us to fill a bath without the water running cold. The boiler fires up every time...
At present we have a Saunier Duval combi boiler together with a 150Lt accumulator, both of which are situated in the basement and water is circulated by a Grundfos pump. Our gas bills are astronomical and we suspect that a good part can be attributed to the boiler constantly firing up to keep...