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Thread: Downsizing inlet/outlet on baseboard

  1. #1
    DIY Senior Member chefwong's Avatar
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    Default Downsizing inlet/outlet on baseboard

    AFAIK, most of the hot water baseboards are 3/4" inlet/outlet.

    My current Runtal is piped 3/4 inlet/outlet. Don't recall if it was a special order....

    There's 2 lines in Runtals offering. Standard and Custom.
    Under their standard, which is offered in all shapes, sizes and colors, the inlet/outlet on them is 1/2.
    Just short of me using a 3/4 - 1/2 adapter, what are the DRAWBACKS on having the inlet/outlet on the baseboard at 1/2. Just less water flow ?

  2. #2
    DIY Senior Member chefwong's Avatar
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    Terry or any Mod. Can you move this to the heating forum.
    Maybe someone over there with expertise might be in the know.


    thx

  3. #3
    In the Trades Tom Sawyer's Avatar
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    Default

    Yes, a bit less flow but probably not an issue unless the unit is on a long run. Most manufacturers of baseboard offer it in 1/2" also but it's not usually a stocked item. Go ahead and use a couple of reducing couplings there.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  4. #4
    Moderator & Master Plumber hj's Avatar
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    If it is part of a "loop" system, it will reduce the flow to ALL the baseboard units. If it is a single unit, such as if it replaced a radiator, then there is probably no downside to doing it.
    Licensed residential and commercial plumber

  5. #5
    DIY Senior Member chefwong's Avatar
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    There is a inlet / outlet. A peek in the furnace room as well as the drop where the radiator is, looks to be 2" pipe running the entire perimeter with tees going to 3/4.

    So the majority of the water is 2" with 3/4 feeding the baseboard.

    Hence I'm not sure if by downsizing, am I reducing the flow of the entire system bearing it's a mixed 2" and 3/4 to the legs.

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