National Oilheat Research Alliance 25 heating season. This means that the efficiency does not go down through the season like it does with older burners. Not only do the new burners use less oil, thanks to the PSC motors, igniters and interrupted ignition they use dramatically less electricity. Venting Venting combustion gases reduces the efficiency of the heating system, but it is important to remember that in trying to make the venting more efficient, ensure all the combustion gases are safely removed is the top priority. Draft regulators allow heated air from the building to flow up the chimney. However, many chimneys produce such a strong draft that it affects the fire. NFPA 31 states that a draft regulator should be installed on all units unless the manufacturer specifically says not to in their installation instructions. Several boiler and furnace manufacturers recommend draft regulators not be installed on their units Chimney lining and insulation can improve the performance of oversized or worn out chimneys, reduce chimney heat loss rates, and produce more stable chimney draft. Upgrading the chimney allows for the use of higher efficiency boilers and furnaces without worry about condensation and serious reductions in chimney draft caused by lower flue gas temperatures. New Boilers and Furnaces: The Best Investment a Building Owner Can Make When replacing a boiler or furnace, customers gain all the advantages of the new burner and also gain large reductions in off-cycle losses. These off-cycle losses are the big difference between the old and new furnaces and boilers. Some new boilers on the market have almost zero off-cycle losses compared to the 5 to 12% off-cycle losses from older boilers. The appliance manufacturers have done this by tightening up the flue passes in the heat exchangers and reducing the mass of the heat exchangers. These changes have dramatically reduced heat losses and increased efficiency. Older heating units are inefficient and oversized. New high efficiency oil boilers and furnaces have Annual Fuel Utilization Efficiencies (AFUEs) between 83% and 97%. Replacing old and outdated heating units will cut fuel consumption and increase customer satisfaction. Typical savings for installing a new furnace or boiler is between 20% and 30%. High Mass or Low Mass? High mass units have lots of iron and water and rely on a small but constant fire. These units need significant mass to absorb the heat and hold it for the heat distribution system to do its job. They feature low firing rates, long burner run times, with long burner off times in between. They are well-insulated to reduce off-cycle losses. The alternative is low mass. The first low mass boiler was the System 2000 from Energy Kinetics. It is made of steel with less than three gallons of water in the boiler. Control strategies and design enable cold start and cold finish, resulting in almost no heat being left in the boiler
NORA Advanced Efficiency
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