However, the company did note that lately it has noticed a change in the tone of the solid-fuel boiler market, primarily in North America.

Solid-fuel boilers are used primarily by companies that produce electricity from coal, petroleum coke, biomass and other such fuels. '

A solid-fuel boiler, whether a separate boiler, an Aga-type cooker/ hot water boiler or a back boiler, is the most difficult to control and will heat the water to some extent all the time that the fire is lit.