Wetbacks good in some situations
Wetbacks can be attached to wood, pellet, coal or diesel burners.
They are worth considering if using a burner for space heating; if you have a reliable and cheap source of sustainable firewood; or if you live in a location where other energy sources are expensive, limited or intermittent. directly above the heat source.
This may require longer pipe runs to hot water outlets.
Some systems may incorporate an electric pump to increase pressure and allow transfer to storage cylinders located further away. proximity, preferably no more than four metres apart, if using a wetback.
In addition only copper pipes should be used within a wetback system due to the high temperatures.
Use caution when coupling wetbacks with heating systems (i.e. radiators or underfloor).
Wetbacks will generally not have a sufficiently high heat capacity to supply heat to a large area thus the electric element(s) in the cylinders may end up operating more frequently than planned.