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Oil to Nat Gas replacement boiler

Ed_26 Member Posts: 284
Your contractor will be able to properly size the replacement & advise you in regards to venting issues & will be able/required to properly install the necessary piping to applicable codes for your location.


  • Al Pirrocco
    Al Pirrocco Member Posts: 1
    Oil to Natural Gas Replacement boiler

    I am planning on removing a 50+ year old American Standardhot water boiler and above ground oil tank from my basement.The replacement unit will be natural gas.My main concerns are proper sizing for the new unit,concerns for venting into an interior chimmeny.Any other tips would be appreciated.
    Thank You.
  • Robert O'Brien
    Robert O'Brien Member Posts: 3,541

    heat loss calculation is necessary to properly size. I would line a masonry chimney and inspect a metal chimney for suitability.How about a mod/con? Eliminates the chimney concern and much greater efficiency.

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  • Ken_40
    Ken_40 Member Posts: 1,320
    Bob's right!

    The old A/S was sized based on domestic hot water production, not what it takes to heat the home. Unless your home is larger than most, something in the 50,000 BTU range will heat it nicely. But one cannot guess at this, nor can one simply look at what's there and use the existing boilerr size to determine what the replacement should be.

    Things have changed so much since the A/S was installed in this biz, anyone who looks at what's there and suggests something equal is NOT the guy you should bother with!

    A few of the mod-cons, which is definitely a design you should consider as one of the best bangs for your buck, allow venting inside the existing chimney! The liner would be PVC! An indirect water heater is also most desireable.

    When the least expensive is also the most efficient and gets over 92% AFUE, you have few choices that are as viable IMO.

    I like HTP's Munchkin as athe best bang for the buck boiler and indirect, although I like the Weil McLain "Plus" series of indirects as much as HTP's. Either way, a mod-con must be included in your search.
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