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Old 07-16-18, 02:00 PM   #3
Lurking Renovator
Join Date: Aug 2014
Location: Grand Rapids MI
Posts: 12
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The standard gas water heater doesn't solve the issues.

-They cost more than electric (not a big deal)
-You have to vent through a chimney using a chimney liner. This adds additional cost, creates a failure point in the roof, adds permitting costs. I like to eliminate holes in the roof and chimneys as these are old houses and I've had leaks and several $1k+ costs to repair old chimneys.

Looking into solar, it's not a solution in MI. Way too little exposure year round.

I'm exploring 2 solutions now:
-Heat exchanger in the plenum above the furnace.
-Heat recovery system in (shower) drain water.
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