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

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.

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