Gas storage water heaters can re-heat water at a faster rate than electric heaters, therefore the tanks don’t need to be as big.

They come in sizes from 130L to 170L, but this can be misleading, e.g. a Rheem Stellar 160L high efficiency hot water heater can deliver 360 litres of hot water in the first hour and a further 200 litres each hour thereafter as well as having a 5 star energy rating.