Furnaces and Boilers | Department of Energy

Steam boilers operate at a higher temperature than hot water boilers and are inherently less efficient but high-efficiency versions of all types of furnaces and boilers are currently available. To learn more about furnaces boilers and other types of home heating systems explore our Energy Saver 101 infographic on home heating .

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Steam Calculators: Boiler Calculator

Mar 17 2015 · Steam Boiler and Blowdown Pressure are the same. Combustion Efficiency is the % of fuel energy that is directly added to the feedwater and not otherwise lost or used. Blowdown Rate is the % of incoming feedwater mass flow rate that leaves the boiler as a saturated liquid at boiler pressure.

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Commercial boilers - Product ranges - Products - De ...

The oil condensing solution for collective needs ; Return on operating efficiency up to 104% ; A wide output range (from 56.7 to 291.2 kW)

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