1/2\" PEX piping to 3/4\" Sweat

Eric G · October 2003

Hi! I'm hoping I can find some help here. I'm installing Buderus radiant panels in a house that had old floor baseboard. The baseboard had 3/4" Sweat piping. The Panels have 1/2" PEX connections. I have the 1/2" PEX to 3/4" Sweat fittings but need to know if there will be flow issues because of the reduced flow. Should I divert the flow in the 3/4" piping so that there is essentially a bypass that goes directly from the supply to the return? Or should I really not worry about it? There are 3 radiant panels on this one-pipe circuit.

Thank in advance!

Alan(CaliforniaRadiant)Forbes · October 2003

So, the only constriction

is at the connections. I wouldn't worry about it as long as you don't exceed 15,000 BTU's for the 3 radiators.

Since it's a series loop, make sure you have accounted for the lower water temperatures at the downstream radiators.

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Eric G · October 2003

Thanks a ton for the info. The 3 radiators are at about 9500 BTUs, which includes oversize compensation for the final radiator.

1/2\" PEX piping to 3/4\" Sweat

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