hardy steve
ArboristSite Operative
My H2is an older model and is only set up for one pump.I'm wanting to heat detached garage next year.Here's options 1) weld a second nipple on the owb amd attach second pump and ball valve and move on.Or 2)T the 3/4 nipple above pump now and run a second pump that way.My pex now from owb to hx is 1/2". The 3/4" nipple could handle another pump with 1/2" line,but what happens if house pump comes on at same time.You know in the winter it would happen.Would increasing the 3/4" nipple to a 1" bushing then T off with 1" line to both pumps help.