Oil-Fired Boilers and Furnaces
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Oil-Fired Boilers and Furnaces

Oil-fired furnaces and boilers are a popular choice in areas of the country with limited access to natural gas, such as the Northeast. Oil-fired furnaces and boilers present an opportunity to use renewable fuels to heat your home. A number of companies are now offering heating oil blended with biodiesel, allowing their customers to reduce their dependence on foreign oil while drawing on a domestic energy source. The biodiesel blends also produce less pollution than pure heating oil.

A number of retrofits are possible for oil-fired furnaces and boilers, but before pursuing any retrofits you should consider the potential added benefits you could receive by simply replacing the furnace. The following retrofits are possible:

Vent dampers

The most common retrofit is the addition of a vent (or flue) damper. A vent damper prevents chimney losses by closing off a boiler’s vent when the boiler isn’t firing. Steam boilers benefit from vent dampers more than hot-water boilers, and bigger boilers benefit more than smaller ones. Vent dampers, however, may not be cost-effective with properly sized, newer furnace models. For older oil burners, converting to a flame retention burner (below) is probably a better investment.

Barometric flue damper

During your annual service checkup, have your technician perform a draft test. If too much heat is going up the chimney, you may need to install a barometric flue damper. The cost is less than $100 and could save you about 5% of your fuel cost.

Derating or replacing oil burners

Many boilers and furnaces in today’s homes are oversized, particularly if you’ve upgraded the energy efficiency of your home. It is simple to reduce the heating capacity of your oil boiler or furnace to make it operate more efficiently by having a technician install a smaller nozzle. The cost is minimal and it could cut fuel bills by as much as 10%.

If you have an old, inefficient burner, though, you may want to replace the whole burner. A flame retention burner will block airflow up the chimney when the unit isn’t running, saving up to 20% on fuel costs at a cost of about $500. Note that steam boilers should only be derated if the steam system is also modified to remove excess radiators, which is a tricky procedure.

Modulating Aquastats (for hot water boilers only)

An aquastat controls the temperature of the hot water in a boiler, typically keeping it around 180°F. But when heating needs a lighter in the spring and fall, that’s actually higher than needed and wastes energy. A modulating aquastat, also called an outdoor reset, senses outdoor temperatures and adjusts the hot water temperature accordingly. The units can save up to 10% of fuel costs, and cost several hundred dollars.

A cheaper alternative is to manually adjust the aquastat yourself, turning it down to around 120°F during the milder heating season. Consult your owner’s manual or a service technician to locate the aquastat.

Time-Delay Relay (for hot water boilers only)

A time delay relay is a way to squeeze the most heat out of your system without running the boiler. When the thermostat clicks on, the relay causes the boiler to circulate hot water through the system without turning on the boiler. After a set time, the boiler will fire up. A time delay relay costs about $100 and can cut your fuel costs by up to 10%.


U.S. Department of Energy

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Our Reviews

See What Your Neighbors Are Saying

They were on time and installed a sump pump in my basement without any issues. I would highly recommend this company.

Toni D.

Toni D.

From quick response to great installs, this teams is amazing. Heating, A/C and plumbing, if you need work done, call Arctic Bear! They have balanced my heating and A/C throughout my house for a more comfortable feel. Their technicians are friendly and efficient. I would highly…

Jeff W.

Jeff W.

I am truly impressed with Arctic Bear's work, responsiveness, and attention to details. They replaced my water heater and, in addition to that, they upgraded all the pipes, valves, and so forth. It is wonderful to encounter such professionalism and exceptional customer service in Vestal.

Sean C.

Sean C.

Called Arctic Bear a week before Christmas following a disaster in the basement that resulted in my furnace being completely submerged. Arctic Bear was here in 1/2 hour and even though there was nothing they could do for my existing furnace, they were back in 36…

Janet B.

Janet B.

Arctic Bear has been servicing my heating, AC, water softener, and filtration systems for approximately 14 years. I’ve always had great service with the service plan I use, and their technicians are very knowledgeable and professional.

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J.W.

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