Correct placement of circulator pump

JBB · October 7

Hello, I have a question regarding the placement of a Taco circulator pump. Mine is a radiant underfloor system using a 40 gallon gas water heater as the heat source. I had to replace it, and the pump, they were both over 10 yrs old. The flow direction is IN at the water heater drain, and OUT at the hot side of the top of the wh. Should this be piped out at the bottom, and in at the wh top? This is a closed system, with an expansion tank on the wh top cold pipe. JB

Thanks for the help!

Jamie Hall · October 7

Direction of flow through the tank isn't that critical — it's forced flow, so having the hot outlet at the top isn't that important.

What IS important is where the expansion tank is relative to the circulator: the expansion tank should be connected a foot or two upstream of the INLET to the circulator.

JBB · October 7

Thanks; So the expansion tank should never be instaĺled on the cold water inlet side of the water heater at all?

hot_rod · October 7

is the water heater supplying hot water fir the building ? Or is it dedicated to the radiant?

JBB · October 7

supplying hot water to the radiant underfloor system only

hot_rod · October 7

the pump can go on either supply or return piping

What is important in the expansion tank should be on the inlet side of the circ, regardless of the pumps location

The air purger always goes at the hottest point in the system, right out of the heater/ boiler

See examples

JBB · October 10

Thanks; that is exactly how mine is set up!

Correct placement of circulator pump

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