I'm going constant circ this year and

Mike T., Swampeast MO

...but once you experience proportional it's hard to imagine anything better.

hr

don't try to talk me out of it

I'm thinking this Caleffi approch. The HydroLink serves as my primary loop and purger. Inexpensive 3 way zone valves are the means for constant circ. a modulating heat source will be weather responsive (outdoor reset)and should keep the system flowing from 68° outside and down.

This 3 way zone valve was our old friend Dan Peel's favorite piping method, May he rest in peace.

hot rod

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Dan_15

So am I, and this will be my constant circ.