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    artweidner's Avatar
    artweidner Posts: 1, Reputation: 1
    New Member
     
    #1

    Dec 14, 2007, 08:23 AM
    Flucuation in water pressure in home
    I have a well system for my house. I added a tankless water heater. I now have a problem with the water heater dropping out of the heating mode due to the flucuation in water pressure just prior to the system calling for the pump to turn on; there is a pressure drop just prior to the pump coming on that shuts the tankless water heater off (pressure switch controls the operating time of the heater) and I get cold water. Once the pump brings the pressure up the heater turn on again and works correctly. Is there another way to solve this low pressure other than adding a secondary pump to the system? Can I somehow make a change to the switch-on pressure the pump comes on at so the pressure does not drop into the heater cut0ff pressure level?

    Thanks,

    Cold Shower Art
    doug238's Avatar
    doug238 Posts: 1,560, Reputation: 62
    Ultra Member
     
    #2

    Dec 14, 2007, 07:29 PM
    This may or may not work, but maybe you will try. Home depot has a recirc system for 199.95. It has a small pump for the water heater and a crossover for the farthest fixture. Use a switched outlet for this and every time you want hot water flip the switch first. Don't forget to flip the switch back.
    jlisenbe's Avatar
    jlisenbe Posts: 5,020, Reputation: 157
    Uber Member
     
    #3

    Dec 14, 2007, 09:04 PM
    Why not just set the cut in pressure on your well a little higher? If it is cutting in at 30#, set it to 35#. That would prevent a pressure drop from kicking off the heater. Good explanation of how its done by Speedball is found here. Look at the second post:

    https://www.askmehelpdesk.com/plumbi...ressure+switch

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