Pellet heaters have a fair market in the US. Here in the Northwoods, a type which burns dried shelled feed corn is pretty common - lots of 'em are used for heating agricultural outbuildings, and lots more are primary or secondary heat sources for dwelling units. Quoted operating cost for a unit capable of up to 40,000 BTU/hr is around a dollar a day.
Heres'
A link to one vendor's product - no endorsement implied, just provided as example.
BTW, here at Castle Timber, we have hot water heat; the primary heating plant is a propane-fired furnace down in the basement, and a secondary plant is an outdoor woodburner. The woodburner really impacts the cost of a heating season (which hereabouts is roughly October thru May
).