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Thread: Gravity Fed Hot Water

  1. #1
    DIY Junior Member
    Join Date
    Jan 2010

    Default Gravity Fed Hot Water

    Hello Everyone,

    Not sure if this is the best place to post this or not but here goes!

    Basically what I am looking to do is get hot water to fixtures quicker. House is a Tri-level with a basement. My hot water system branches off into two different directions so will eventually need two loops. For now Im focusing on the loop for the main level. I have a 50 Gal. Marathon water heater in my basement and Im going to try the gravity fed route first and add a pump of some sort later if it doesnt work out. I also have a FHP Geo unit with a DSH. Below is a picture of my existing setup minus the purple return line w/check valve and the check valve on the DSH return line. My existing expansion tank is 2 gal. and total loop run will be approx. 55 ft. From what Ive read I need to use a swing style check valve on the loop and drill a small hole in it for convection.

    Im basically looking for any input, recommendations, etc. Any and all help would be greatly appreciated.

    Will this system work like this? Should I make any changes? All pipe is 3/4 copper. Should I go with a bigger expansion tank or will the 2 Gal. be sufficient?

    Scott S.
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  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
    Join Date
    Aug 2009


    That should work very well. When adding the 2nd loop install a valve on each loop for balancing.



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