Jet Pump For Non-Pressurized Solar System?

Discussion in 'Solar and Geothermal Water Heating Forum' started by atw58, Jun 25, 2011.

  1. atw58

    atw58 New Member

    Jun 25, 2011
    Toronto, ON
    Hi all,

    I am installing a non-pressurized solar water heater on the roof. It has a 40 gal storage tank connected to evacuated tubes which heats the water using thermosyphon. A solenoid controls filling the roof tank with cold water when the water level is side the tank drops below a certain point.

    Since this system is non-pressurized, it needs a pump to bring the hot water up to 40/50 psi before feeding the hot water side of the home's plumbing. The pump will be in the basement and the distance between the tank of the roof and pump is 25-30 ft. We currently have a 40 gal natural gas hot water tank.

    Ok, here are my questions:
    - What type and size of pump should be used shallow well jet, jacuzzi, etc.
    - Can the pump feed hot water supply directly or is a water pressure tank needed. If so what should the size be.
    - The water temperature can be as high as 150 F. Does this affect pump selection or water pressure tank.

    I appreciate any advice you have.


    Attached Files:

  2. cssolar

    cssolar New Member

    Dec 20, 2010
    agost alicante SPAIN
    Hi I have a non pressure system and use a small wilo auto boost pump which fires up when a tap is opened, the water is used directly ( no extra storage tank )

    I do have a gas bolier for back up, with valves to change over manualy

    TONY cssolar
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