Question

347

Happy Holidays to all,
I'm installing a standard cast iron boiler with an indirect water heater, three high temp baseboard zones and adding two radiant heat zones (14k heat loss on both). I would like to do primary secondary piping to reduce the possibility of condensation when the radiant zones are calling.
I can't remember if I should install the piping for the indirect before (one tee before and one after) the closely spaced tees or in the secondary part of the piping. If before the secondary manifold the return tee will be installed the at the boiler return before the circulator for the primary loop.
Thank for the help.
Michael

Alan (California Radiant) Forbes

Before

Gordy

Since you will be adding radiant.

347

I was thinking something like this, except I'll have the high temp zones after the mixing assembly along with the radiant

STEVEusaPA

You probably want high temp before mixing station, and a few well placed flow checks.

Gordy

Yes highest temp zone first.

347

Yes, I was doing that. Just wanted to double check about keeping higher water Temps on the return.

Alan (California Radiant) Forbes

Does it matter if you have DHW priority?

Gordy

No, just the radiant.