The Brute™ Series 1000 & 1200 operates at firing rates as low as 100,000 BTU/Hr., resulting in low temperature thermal efficiencies as high as 99%, and 94% at full fire. The Brute 1000 & 1200’s two equally sized burners can modulate independently of each other, closely matching the heater’s firing rate to the connected load, maximizing fuel utilization. The dual burner design also provides redundancy.