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.

boiler size

holinn Member Posts: 1
We have a 1950 sq ft house on cement slab with fireplace. The first floor has always been cool. We are replacing a 101 btu Peerless with internal coil for hot water. There are 3 heat zones. Installer proposed a Buderus g115ws3( DOE 85k) with 4th zone for hot water tank. I am concerned this may be too small a boiler. Next step up is Buderus g115ws4 (DOE 109k). I don't want a cold house after this replacement. Thanks for your time and thoughts


  • SWEI
    SWEI Member Posts: 7,356
    Emitter size

    and room-by-room heat loss will tell you whether this is true or not.  85k output gives you 44 BTUs per square foot, which is quite likely oversized itself.
  • Aaron_in_Maine
    Aaron_in_Maine Member Posts: 315
    Heat loss

    You need to have a heat loss on your house. That being said unless you are in Antarctica the three section will do just fine. They sized boilers with tankless coils for the hot water load but with a indirect you size the boiler to the actual heat load. If I had to guess depending on your location your heat loss is less than 60,000.

    There was an error rendering this rich post.