Thor Forums

[Laco]

Typically the fixed pressure regulators are less expensive and are not all that accurate. You should be able to get up to 60PSI without creating plumbing problems, it says here in fine print. The conservative approach is to not go higher than 55psi. Somewhere buried in the Girard documentation, or they told me, you need a minimum of 50psi, hence the recommendation to set your adjustable regulator between 50 and 55. I was about ready to pull the tankless and put a regular water heater in, then read that about pressure, dumped my cheap fixed regulator, went with an adjustable set to 53psi, and the heater works great now. We have no problems mixing hot and cold water for the temp we want for things like the shower. I set the temp for 118 to 120 degrees, and frankly am pleased with how it works.