natural gas hot water boiler Agents direct combustion efficiency

Direct vent vs. power vent gas water heaters ...

Mar 08 2016 · The steady state combustion efficiency is about 80% the 2015 EF energy conservation standards the minimum efficiency for gas fired HW heaters under 55 gallons is a minimum EF of 0.675 - (gallons x 0.0015) so the minimum legal 50 gallon unit would have an EF of: 0.675 - (50 x 0.0015)= 0.60.

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Furnaces and Boilers | Department of Energy

Although older furnace and boiler systems had efficiencies in the range of 56% to 70% modern conventional heating systems can achieve efficiencies as high as 98.5% converting nearly all the fuel to useful heat for your home.

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Combustion Efficiency and Excess Air

5 - 10% for natural gas; 5 - 20% for fuel oil; 15 - 60% for coal; Carbon dioxide - CO 2 - is a combustion product and the content of CO 2 in a flue gas is an important indication of the combustion efficiency. Optimal content of carbon dioxide CO 2 after combustion is approximately 10% for

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