Do radiant heating systems support alternative fuel sources?
Hydronic heating systems generally heat the water with electricity or gas, but there are alternatives. A popular concept of recent decades is the ground-source heat pump, where the ambient heat energy of the earth is extracted and used to heat the water using coils buried deep in the ground. Further in the past, radiant heat systems have used boilers fired by coal and wood, but these are no longer considered practical heat sources for an increasingly carbon-conscious society.