Heating large tanks with your gas hot water heater. Save 40% on energy cost!

Sean Clark

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I have been doing a version of this for about 8 years. The power savings are amazing. 5 watts of power for circulation and I keep my 200 gallon reef heated to 78 deg.
 

Enderg60

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On my last system (540g system) I had the sump in my unconditioned basement. I was running two 1000w heaters nearly 24/7 in the winter.

I put it on a small gas heater with a PEX loop in the sump. With no insulation, no care of efficiency and everything set on the lowest settings I saw my power bill drop about $40 a month in winter. My gas bill never even registered a noticeable change.

I want to say the whole setup cost me about $500 ($200 of which was the water heater) and paid for itself in about 3 years.
 

Reefing threads: Do you wear gear from reef brands?

  • I wear reef gear everywhere.

    Votes: 36 15.7%
  • I wear reef gear primarily at fish events and my LFS.

    Votes: 13 5.7%
  • I wear reef gear primarily for water changes and tank maintenance.

    Votes: 1 0.4%
  • I wear reef gear primarily to relax where I live.

    Votes: 30 13.1%
  • I don’t wear gear from reef brands.

    Votes: 133 58.1%
  • Other.

    Votes: 16 7.0%

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