is this 50-55 psi a "general rule" for tank-less heaters? i got a fixed regulator after reading the high psi could cause pipe bursting water damage. i just tried in my "campsite" (driveway) and i have hot water if the water pump is on. if it's not running, and on the city water, no hot water.
ordered a adjustable one on amazon so we shall see...
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1