Radiant Floor Heating - Reducing Pressure to the system

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Joined
Nov 13, 2024
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Seattle
Hi all,

I hope this isn't too long, but I will try to be concise.

The current pressure coming into my house is 78 PSI, which is too high for my radiant floor system (which should be 40-60 PSI). The radiant floor system is an open system. Consequently, I was told that I needed to place my water pressure-reducing valve near the main shut-off valve or before any water interacts with a fixture. Due to various issues (mainly to location and expense), I wanted to know if there was any other way to reduce the pressure going into my radiant floor system.

Just some more information:
* Although the radiant floor system is open, the water that feeds this system comes from a Polaris Water Heater and does not directly interact with other fixtures.
* A plumber placed a pressure-reducing valve to the outlet to the radiant floor system, but the pressure was only temporarily reduced (I was later told that the "The pressure was not lowered (simply) as it equalized because all other valves were fed from another direction/higher pressure source."
* I have a photo of my system in the attached file. I thought reducing the pressure going into (#1 valve) and out of the water heater (valve #2) could reduce the pressure going into the radiant floor system. I'm not too sure if this the case, but if I can install the water pressure valves at these two points, I would save myself time, money, and a ton of headaches.

Thanks
 

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