Re: Problem with 12 v pump supplying on demand water heater

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.