A wood pellet heater can be a fairly complex item, for a backup (depending on what usage frequency backup entails) a wood fired furnace might be more suitable if the owner is happy with having to add fuel every once in a while.
Myself, I would like a ground source system that lets me store in heat from an oil fired AGA, a wood burning furnace and water heater panels on the roof.
Myself, I would like a ground source system that lets me store in heat from an oil fired AGA, a wood burning furnace and water heater panels on the roof.