Need help with an off beat plumbing project

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Forum topic by boroughdan posted 06-29-2013 11:30 PM 669 views 0 times favorited 2 replies Add to Favorites Watch
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22 posts in 1938 days

06-29-2013 11:30 PM

Ive had this idea since I bought my house. It has always bothered me that I send cool water to be heated up with gas I pay for in a water heater that sits in a garage that isnt far from the desired temperature.

So I had an idea do divert the infeed pipe into a pex run that shoots up into the attic and coils along the roof and back into the water heater. After realizing that 100 ft of tub only holds about 4 gal of water I realized i needed a tank.

So here is the system. cold water comes in. Gets diverted into the attic via a pex line into a holding tank. That tank would have four connections, one in one out and two for recirculation. There would be a pump that would recirculate the water in the tank through tubing along the underside of the roof in the hottest part of the day. Then of course the outlet leading to the water heater.

My problem is finding supplies. I dont know much about pumps or tanks. I found a site called tank depot that has a good selection of tanks. a 45 gal is about 100 plus 55 shipping. Its cheaper than the ones at TSC but not by much. There just seems like there could be a cheaper way. I used to pressure wash and we would get a 55 gal barrel of bleach for about that price. Im sure its a different grade of plastic. Im wondering if I could just get a metal water heater tank w/o the elements or something.

Also the pump. I found some solar pond pumps for about 30 on amazon. Solar would work out great because I wouldnt need it on a timer it would just come on at the hottest part of the day. But I dont know if I would be able to attach an in and out pex run. I need a smalle, slow pump with and inlet and outlet. Any ideas?

2 replies so far

View papadan's profile


3584 posts in 3364 days

#1 posted 06-29-2013 11:56 PM

Forget the tank and pump. Build the grid under the whole roof out of 1/2 or 3/4 cpvc and paint it flat black. That should provide plenty of hot water during the daytime at least.

View kdc68's profile


2657 posts in 2272 days

#2 posted 06-30-2013 12:03 AM

Clever idea….

Try Surplus Center for a pump

-- Measure "at least" twice and cut once

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