u/BullCityDriven

Hey y’all, in the midst of replacing the two gallon expansion tank on tankless water heater feed. Seems pretty straightforward, with one critical factor being the tank pressure matching house system pressure. My well pump runs 20/40–I’d guess setting the tank to 40 would be right, but would like to double check, and it’s Sunday, so local shop is closed and not trusting big-box advice.

Thanks for any input—40, 20? 30?