Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

gravity conversion

Paul Pollets
Paul Pollets Member Posts: 3,656
I'd pipe the mains using a 3" 4 way valve with bypass using the Logamtic control with mixing valve card. Close the system by removing the attic tank with an air vent at the attic riser, new exp. tank at the boiler.

<A HREF="http://www.heatinghelp.com/getListed.cfm?id=104&Step=30">To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"</A>


  • Bob_67
    Bob_67 Member Posts: 4
    gravity replacement

    Hello I just looked at a gravity system from around 1919 the original boiler has been replaced with a smith mills boiler.about 500 thousand btu`s .I calculated the load and it is around 350 thousand I would like to install a buderus g315 with outdoor reset and run constant circlation.My concern is the piping in the system is 8 inch that loops from boiler to the attic where the open expansion tank is then returns to the basement.I would like to do the instalation so the system is as efficent as possible .I dont no if I should pipe the boiler primary secondary or pipe right through the boiler.buderus said it woulndt be a problem but I am worried because of all the water content .they presently burn 8000 gallons of oil a season and there is no dometic water.heating only
  • mark  smith
    mark smith Member Posts: 112

    P S
  • Cosmo_3
    Cosmo_3 Member Posts: 845
    Primarily speaking

    P/S is the way to go here in my opinion, or a 4 way. Also get rid of that attic expansion and install a closed bladder type in the mech room. Like you say you can set up the circ for constant/or not. Have you thought about staging? Maybe 3 smaller boilers, or even 2 boiler instead of one big one? That is where you will get your efficiency using a P/S piping philosophy. Have fun sounds like a cool project

    Cosmo Valavanis

    Dependable P.H.C. Inc.
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928

    Any way to include TRVs in the renovation?

    Sounds like an utterly first-class "overhead" gravity system in need of its' first real update after generations of fine service...
  • Cosmo_3
    Cosmo_3 Member Posts: 845

    Would be the sheez-nit, good pickup

    Cosmo Valavanis

    Dependable P.H.C. Inc.
This discussion has been closed.