Is it better to pump to or away from boiler?

scrook_2

pump away from the expansion tank!

Jim_174

slab in floor heat

I want to know if I should install pump on return or supply of boiler and should I install a bypass

Brad White_191

Depending on

what kind of boiler you have determines the need for a bypass.

If a conventional cast iron or other non-condensing boiler, yes, a bypass is required to keep the return water temperature above the dewpoint. Ideally, this would take the form of a 3-way temperature activated valve or a variable speed setpoint circulator; make it "smart", not just "set and forget".

As for the pump location, that matters less than where the expansion tank is connected. Always connect the expansion tank as closely upstream of the circulator pump as you can.

Brad White_191

Exactly!

Thanks, Scrook... My other new years resolution is to be more succinct..