A Biomass boiler can provide all the warmth and hot water for a building and is as easy to use as a gas or oil boiler. However the difference is that the fuel contributes no carbon to the atmosphere and it's less expensive than gas, oil, or electricity.
The biomass wood pellets are delivered by road and fed to a hopper next to your boiler which can operate for months at a time without the need to remove wood ash.
Other forms of biomass include the combustion of split wood or cereals, with some boilers even being designed to be on show in a living room.