Snow melt and radiant from one boiler idea (hr)

Dan Peel

HR, Provided the exchange rate of the tank is high enough to convert those 150Mbtuh into the glycol that's a wonderfully efficient solution. For your weather I'd glycol the boiler and run the snowmelt off the primary (with the radiant drawing down the buffer) reducing boiler cycles with wide DTs. Enjoy....Dan

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Yet another

mega home with insanely small mech room. I have a space 40" wide and 65" deep space for a radiant and snowmelt boiler.

Here in SW Missouri we get MAYBE 4 or 5 snow falls per year. Usually melts away within a week.

I'm thinking I size the condensing boiler to the snowmelt load, about 150,000. The radiant load for the slab areas only, is just under 90,000.

So I set the condensor on top of a Weil or Triangle tube indirect tank. (tank in tank design) I use the inner tank capacity, let's say 50 gallons, as a buffer for the boiler, and the radiant source.

The outer tank, lower water capacity, usually only 3-5 gallons, is glycoled for the snowmelt.

The snowmelt is on priority, as the home has four furnaces, and the homeowner wouldn't mind FA heat for a few days the snowmelt might call.

The boiler would be oversized for the radiant, but with a modulating boiler and a large buffer tank, I think this would smooth out. Temperatures for the snowmelt and radiant are fairly close, so I may not use any mixing devise.

Any thoughts?

hot rod

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