Check out my Munchkin Piping Schematic

Tom Hughes

I show the primary pump pumping into the Munchkin because HTP told me to do it that way due to issues with a pressure switch. And yes, I would want to alternate the fire sequence. But because its piped in paralell both boilers are seeing the same return water temperature and both boilers would modulate down to low fire until the load is met by a single boiler modulated down to its minimum. In other words both boilers should run most of thr time. I think this should work!

Tom Hughes

This is for an insanely huge custom residence that has such large domestic hot water loads that I'm using two 119 gallon superstor tanks and 2 munchkins that also provide space heating via a few fan coils that also have cooling and some radiant floor heating.

Any comments?

Earthfire

munchkin piping

I do believe that HTP wants you to pump into the munchkin, (To every rule there is an exception even pumping away)Are you alternating the boilers fire sequence or is it permanent lead with backup?