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Boiler conversion

Bob Larson_3Bob Larson_3 Member Posts: 13
I have a customer with a 20 year old Burnham oil boiler with DHW heat exchanger, and wants to switch to gas. Is it even worth considering a conversion? If not, what would you recommend? Notice how low the vent is going into the chimney, nowhere near an exterior wall in a finished basement.


  • How much DHW do you need? How many bathrooms? How many residents? Looks like you have radiators, correct?
    Often wrong, never in doubt.

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  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,571
    The flue should rise up higher at the boiler, it's called "self venting", not sure that boiler is worth a conversion
  • SteamheadSteamhead Member Posts: 14,058
    Looks like a tankless coil- not sure you're gonna find an atmospheric gas boiler with one. Is there room for an indirect tank?
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
  • I misunderstood and think he's considering keeping the existing boiler, converting it to gas.
    Often wrong, never in doubt.

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  • Bob Larson_3Bob Larson_3 Member Posts: 13
    Yes, I was wondering about the feasibility of converting it to NG. There's a 65 gallon electric tank next to the boiler, I think the HX on the boiler is just auxiliary. The house has 2.5 baths, 2 people living there.
  • motoguy128motoguy128 Member Posts: 244
    What type radiation? IF high mass, a mod con with outdoor reset would save a fair amount and would work with a combi as a reasonable price. At 20 years.... you roll the dice a little. It should last 10-20 more, but might not if it has leaks and water quality is poor.

    A combi would save at least $50/mo in electricity for DHW. I added an indirect to my steam boiler and electric bill dropped almost $100 and gas bill only went up $30. But I have 3 people so more laundry.

    Is the chimney lined?

    Seems like the conversion would be almost 1/3 the cost of replacement.

    My worry is that once YOU “touch it”, YOU own it as a contractor. IF there’s any issues, you’ll have call backs. If its something you do a lot of, then its not a big deal.

    I’ve had to learn that lesson too many times. You take on something that wasn’t really installed right and commit to fixing it instead of putting up your hands and saying “I’m not touching it” and quote a replacement.

    What’s really in the customers best interests?
    Bob Larson_3

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