Hot Tap Water...Faster

toolmanmike said

I haven't studied up on the on demands but I did broaden my knowledge on our boiler replacement a few years back. 3500 square feet and it heats the house heating only a couple gallons at a time. I got a Weil McLain energy efficient boiler. In essence it is a "on demand" design. Saved me $100 a month average on my heating bill over the old 6' long cast iron boiler we had.

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Damn $100 a month?? That's impressive. My design is just a theory and really just a side thought when I was bored. I also never understood why the water heater and the furnace don't share the same heat exchanger, I suppose because one goes bad before the other and people huck the whole thing out in favor for another. I thought it was so cool long ago when I first saw an atv starter that was also the alternator. We could all save space, weight, moving parts if things had dual purpose.