To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

Recessed steam radiators

My town's plumbing/building inspector (Bob, of Glen Ridge, NJ) suggested I write to this site and ask for advice about recessed steam radiators in my 100-year-old Dutch colonial home. I added a powder room that's 4 X 5 feet with a 10-foot ceiling and for that my plumber and the folks at the plumbing supply store recommended I install a recessed Sun Radiator with 4 sections or segments (2,000 BTUs; the smallest available). For my kitchen, which also has 10-foot ceilings and is 10 X 18 feet, we removed the free-standing radiator to make room for new cabinets and are now planning to use a recessed Sun Radiator with 12 sections or segments (7000 BTUs)--again as recommended by my plumber and the plumbing supply store. Does this sound right to you? And do you have any other suggestions or advice?


  • Jamie HallJamie Hall Posts: 4,081Member ✭✭✭
    Depends on so many things...

    the basic one being what is the heat loss of the room at the design outside temperature and inside temperature?  But in turn, that depends on... how is it insulated?  How much outside wall is there?  Are there windows?  What kind?  Are they tight?  And so on.

    Have to admit that the figures don't look out of line, but there is really a lot more to it to make any kind of definite statement.

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-McClain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • jpf321jpf321 Posts: 1,558Member
    you can always...

    you can always (well usually always) slow a radiator down .. but you can never ask one for more than it can give .. when in doubt air on the larger size to start with .. you don't want to try to fit a larger one into a small recessed hole next year if you bet wrong ..

    yes it's all based on heat loss for the room. all rooms are constructed differently and are in different relative geographies. it would help to understand the sizes of your rads in other similarly constructed rooms (in EDR sq ft units) .. do you find the other rooms comfortable with the rads you currently have installed? then work from their sizes and adjust accordingly for the new rads. but you need to kow the EDR sq ft for both the current and new units .. Recessed Sunrads are 1sq ft EDR for each inch wide .. 30" wide rad = 30sq ft EDR .. this just happens to be the case with these types of rads .. other rads are very different in the way you determine EDR.
    Entire Site | MAIN WALL | Strictly Steam | Off-Wall

    1-pipe Homeowner - Queens, NYC

    NEW: SlantFin Intrepid TR-30 + Tankless + Riello 40-F5 @ 0.85gph | OLD: Fitzgibbons 402 boiler + Beckett "SR" Oil Gun @ 1.75gph

    installed: 0-20oz/si gauge | vaporstat | hour-meter | gortons on all rads | 1pc G#2 + 1pc G#1 on each of 2 mains

    Connected EDR load: 371 sf venting load: 2.95cfm vent capacity: 4.62cfm

    venting worksheet download | Lost Art Of Steam Heating | my NEW system pics | my OLD system pics | old patents | pipe size chart | Copper Size Chart: K,L,M

  • MaritaMarita Posts: 2Member
    Good questions!

    The bathroom has one Home Depot-installed vinyl Simonton replacement window (about 2 feet wide by 3 feet high) and has two interior walls and two R-17 insulated exterior walls (stucco outside). The kitchen has 4 Home Depot-installed Sequel wood replacement windows (about 2.5 feet wide by 4 feet high) and has two interior walls and one R-17-insulated exterior wall and one half-insulated R-17 exterior wall (stucco outside). I hope that answers all of your questions!

    Does that help? And thank you for taking the time to reply!
  • haaljohaaljo Posts: 112Member
    I built an addition with recessed radiators -big mistake

    Much less insulation behind the radiator. I put 2" of foam board inside the finished wall but I can still feel a lot of heat on the exterior wall. I added more board on the outside after the fact in  an attemp to reduce the heat loss. Also, brought the pipe to the new second floor (bedroom) inside the wall. Have a lot of heat loss from that idea as well. But the recessed radiators do look good.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!