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Greetings, Would like to hear which brand flat panel radiators are recommended and why.

FlounderFlounder Member Posts: 14
I have decided to go with flat panel radiators and would like to know which ones are good , ones to avoid , best quality for the buck and any other advice that might help my decision. I have a 1550sq.ft. home and according to the SlantFin heat loss calcs. I need 29,500 btu. I would also like to know more about over sizing for lower operating temps and if there is a formula for that. I am in Northern California where temps below 30f are rare. Thank you.


  • ZmanZman Member Posts: 5,831
    edited August 2019
    You will see 2 types everywhere in the market. One is Buderus/Dianorm (and several other badges).They are distributed through local supply houses and are quite popular. I have found that the sizes are somewhat limited and they project from the wall several inches which can be objectionable to some clients.

    Runtal is the other big player. Runtal distributes their product differently. My local supplier will not order them. The manufacture will direct ship or you can order online through I like their low profile and flexibility of sizing.

    With either option, the manufacture prints a table which tells you how to derate for lower water temps. If you are using a condensing boiler, you want to size them for 130 degrees or less on your design day.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • hot_rodhot_rod Member Posts: 13,318
    try and find a brand stocked near you, they are a bear to ship without damage
    Pace Supply, Cal Steam are a couple hydronics suppliers near you
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • FlounderFlounder Member Posts: 14
    Thanks zman & hot_rod for the help , good info.
  • TAGTAG Member Posts: 213
    Have used the Buderus on a few projects -- personal. There are rating at different water temps. I have always used the bypass fitting and the Danfoss head .. typically they go under a window.

    The work very well -- the double thick panels have a mount that puts them away from the wall -- the single panels really don't and I have found they work better a little further out. I usually place a 5/4 strip vertical under each mount.

    I used three of the doubles in my garage ... In my case I used PEX to interconnect.
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