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Indirect Tank - Primary or Second Loop Preferred?
I will be relocating my Burnham Alpine boiler and HTP indiret water tank as part of a basement renovation. I'll be converting from my old gravity fed cast iron pipes to a homerun manifold with pex al pex tubing to each cast iron radiator, so I can tuck the plumbing in the joist bays, and I'll also be adding a second heating zone to the system for the new basement space.
Currently the indirect tank is piped off of the primary loop of the boiler. I plan to use a header to distribute the secondary loops to the radiators and their circulators, so I was thinking I could use this opportunity to move the water tank circulator to this header as well, as it would make the relocation easier.
The boiler circulator is currently configured to only run when the radiators call for heat. If I made this change, I would reprogram the control so the boiler pump would also run for a call for DHW, but other than that, are there any other decisions I should weigh? Is there any reason not to move the DHW circulator to the secondary loop? It would make it easier to replumb when I move the system, but if there another consequence I'm not thinking of, I can make it work the way it's currently set up.