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EDR / BTU's steam / hot water

SteveSteve Member Posts: 486
When I measure up an existing radiator and calculate the EDR, I know you multiply by 240 to get the BTU's for steam. But for hot water I believe you multiply the EDR by 150 for 170 degree hot water - I seem to remember reading this in one of Dan's books - can anyone clarify?


  • SteamheadSteamhead Member Posts: 11,335
    That's right

    assuming you're working with a max boiler temp of 180° F.
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
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  • Brad WhiteBrad White Member Posts: 2,393
    Correct, and

    keep in mind that the reference temperature (the 170F) is the "average" water temperature. This is what Steamhead is saying, re: 180F supply water, but presumes a 20 degree drop.

    If you size for condensing boilers using 140F maximum supply (Say 130F average assuming 120F return), you get about 90 BTUH per EDR.
    "If you do not know the answer, say, "I do not know the answer", and you will be right!"

    -Ernie White, my Dad
  • SteveSteve Member Posts: 486

    thanks guys
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