MEDIA WORKERS AND TV RESEARCHERS - Please seek permission before posting on this site or approaching individuals found here by phone or email - write to the Editor - mail to nick@off-grid.net


Home Forums Technical Discussion Problem with 12 v pump supplying on demand water heater

This topic contains 3 replies, has 4 voices, and was last updated by  elnav 5 years ago.

Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • #37097

    dcraine
    Participant

    Hi

    I have a 12 volt Sureflow on demand pump supplying a Bosch on demand propane water heater. Pump turns on and off every couple of seconds when hot tap is on. Cold system works fine.

    I think back pressure in heater signals pump to turn off. Would a pressure tank or an expansion tank in the system solve the problem?

    Is a larger pump required?

    Pump turns on at 25 and off at 40 psi.

    #42693

    WrethaOffGrid
    Keymaster

    We have a similar setup, and yes, we have a pressure tank, otherwise, every time we run the water the pump comes on, this is much quieter and makes the water pressure more even.

    Wretha

    #42741

    Anonymous

    Yes, you need a pressure tank. I have a little 2 gallon one I ordered from backwoods solar in Idaho that works great & will make your pump last longer

    #42753

    elnav
    Member

    At one time I worked for an RV place and we saw all sorts of ‘defective’ shureflo pumps. I discovered I could disable the ‘defective’ pressure switch by replacing it with a blanking plate and some silicon gasket goo.

    Naturally the customer got a replacement pump and went away happy but I saw no reason to throw away perfectly good pumps that just had a problem with a pressure switch. Sometimes I could even fix the faulty switch by adjusting it. You could also plumb in an external pressure switch. Some systems use a pump requiring an external switch so get one of those and bypass the Shurflo switch.

Viewing 4 posts - 1 through 4 (of 4 total)

You must be logged in to reply to this topic.