[artweidner]

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]

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]

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