The smaller of the two Blue Flame Series boilers is the Inferno Blue Flame. The Blue Flame is offered in two sizes ranging from 87,000-107,000 BTU/Hr and is offered in propane and natural gas weighing between 143 and 154 lbs. These units are built ready to accept concentric venting and can be adjusted to use split or transitioned piping.
The larger of the two BlueFlame Series boilers is the Inferno Ultra BlueFlame boiler. The Ultra BlueFlame is offered in two sizes ranging from 50,000-160,000 BTU/hr and is also offered in propane and natural gas weighing between 132 and 143 lbs. The Ultra BlueFlame features a state-of-the-art two stage firing rate, which allows the heating load to be set anywhere within its operating range and still maintain maximum BTU output for domestic hot water.