flow vs. head in multi zones

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www.hotwaterproducts.com

hot_rod

This is why the HTP Phoenix appeals to me

size the tank and it's burner to the DHW load, which as you mentioned often times trumps the heat load. 80 gallons with a 130K input should cover most residential DHW needs.

Now with an internal, or external like the Rheem Solaraide tank HX, generate your radiant BTUs.

If in fact you commit to tank stored DHW instead of instantanous, may as well leverage that tank of BTUs to supply any sized radiant load.

With it's modulating burner the Phoenix bends over backwards to keep the whole package efficient regardless of the load. Yet the HP is there if needed.

And the solar coil in the bottom may cover the smallest radiant loads on sunny days without firing the burner.

One small, tall footprint keeps the builders happy.

Mine is getting a bit cluttered looking with an external HX. But it is easy to keep tabs on the performance of the radiant side when I can put my hand, and sensors, on it.

hot rod