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Gravity System Conversion

kevin coppinger_4
kevin coppinger_4 Member Posts: 2,124
in THE MAIN WALL
piping the new one properly is key. I have done two in he last year...one gas(ga-124) one oil(g215-7)...both using Buderus boilers w/ the 2107 control and the indoor room sensor so they run on constant circ.The oil one I have not heard back yet but I am confident there bill will be 1/2 of last year...the gas one customer is looking at a 65% savings...both very happy. If it were my house I would stick w/ the oil. LP is not really my fuel of choice.kpc

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Comments

  • Michael Keating
    Michael Keating Member Posts: 11
    Gravity System Conversion

    I am a contractor that has to give a "guarenteed" payback quote on a gravity system conversion. The old unit is a Weil Mclain early 68 series. My guess is early sixties. It has a Carlin burner fireing duel 1.00 gph nozzels. The unit is rated at 300k btu's. It has a 10" breech that is reduced right off to a 9" smoke pipe. It has two large swing out clean out doors on the front and the name Weil Mclain is embossed on the upper one.
  • Michael Keating
    Michael Keating Member Posts: 11
    Gravity System Conversion

    I am a contractor that has to give a "guarenteed" payback quote on a gravity system conversion. The old oil fired unit is a Weil Mclain early 68 series. My guess is early sixties. It has a Carlin burner fireing duel 1.00 gph nozzels. The unit is rated at 300k btu's. It has a 10" breech that is reduced right off to a 9" smoke pipe. It has two large swing out clean out doors on the front and the name Weil Mclain is embossed on the upper one.

    Does anyone know if there is a % of saving by going to a circulated system from a gravity. Is there a published listing of the operating efficiency of the existing unit when designed? Pprestons Guide seems to only go back to the year 2000. Is it a reality to think that if the old unit was designed at a 60 % operating eff. and the new one is 85% that we will be a net 30 % savings just by putting a modern unit in?
    Could I say with certinty that the savings on the conversion plus a conservitive 10% on out door reset will be a certian amount of years payback????
    Also to think out of the box, If the customer was to go to LP gas, would the newer small condensing boilers like the WM Ultra or the Munchkins or the Buderus wall hung units work with so much water volume?
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