Blaze King catalytic wood stoves are four times more fuel efficient than other leading brands. Our bimetal coil thermostat keeps the temperature nice and even. Blaze King manufacturers the top 2 most efficient wood stoves in North America. The King being #1 at 88% LHV an 82% EPA Listed Efficiency and #2 is the Princess at 88% LHV and an 81% EPA Listed Efficiency.