Hot Tap Water...Faster

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.
You are exactly correct and that option was available but the installer didn't recommend it, separate units if one fails. Replacement water heaters are much cheaper than the domestic water add on to the heating system.030.JPG 074.JPG