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Buffer Tanks & Mod Con boilers

hr Member Posts: 6,106
should be fairly close to the output of the boiler attached to it. Sure you lose some efficiency every time you pass through a HX. I'd guess with the low return temperatures snowmelts provide it would run high 90's. So a 140K Munchkin times 965% = 134K or so to the snowmelt.

Basically I turned the indirect into a large surface area, high volume heat exchanger. Ideally the tank should last a good long time as both side operate at 12psi, give or take, and ne, one side glycolled. neither sees new water, both sides being closed loop.

I'm not sure how Weil would view their tank used this way, but with 30lb relief protection on both sides it has all the protection, and then some, that it would as a DHW exchanger.

The boiler is actually sized to the snowmelt load and it has a few floor warming zones for a basement kitchen rec room and the main level kitchen tile. The radiant load is probably under 50 K so the tank capacity provides a nice buffer volume.

hot rod


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