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Thread: Jet Pump For Non-Pressurized Solar System?

  1. #1
    DIY Junior Member atw58's Avatar
    Join Date
    Jun 2011
    Toronto, ON

    Default Jet Pump For Non-Pressurized Solar System?

    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.

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  2. #2
    DIY Junior Member cssolar's Avatar
    Join Date
    Dec 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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