The Xcel Heat Bank works with all types of heat source:
The Xcel thermal stores the heat and uses it to provide enough hot water to run all hot taps at the same time, as well as central heating.
In doing so it makes it possible to run domestic properties from a zero-carbon approach, with backup options tied in.
Currently the most popular combination to achieve zero carbon is a wood burner as the primary heat source, driving central heating and hot water in winter, with solar thermal panels for hot water in summer. This combination has the added temptation of free hot water and heating.
A gas boiler has been the traditional backup, but this is changing towards wood chip, pellet or log boilers, and heat pumps, driven recently by the new feed in tariffs, that pay you money for doing so.