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System was installed in 2004. I believe the ONIX is of the radiant heat type with aluminum shield. The plumber / installer said it was designed for this purpose and system was designed by a heating engineer. I will verify the markings on the tubing to confirm. My lab results came back...

Today I dropped off the sludge and some of the "dirty" water to a forensic chemistry lab to see what's in it. They will be looking for iron, copper, epdm rubber, components of stainless steel. We'll see. Next time I am at the house I will shut off the boiler fill valve. The system should...

Jim, thank you. Yes the system has an auto fill, but if it were leaking - I would see the water somewhere in the house except for the basement radiant heat. I typically shut the domestic water off to the house when we leave - it's a weekend home. I will check the pressure on the system when I...

System: closed hydronic system with Buderus oil fired cast iron boiler and Buderus 50+ gal indirect hot water tank with cathodic protection (electric) Age: Installed new 2004 Problem: No boiler water flowing through the 1 1/2" copper manifold. Description of System: Manifold feeds 4...

Grohe 34-436 BangOr - I don't see why it couldn't be replaced from the back side. Are you sure you want the same valve? Seems like a lot of trouble. I too, have the 34-436 and it's leaking. I replaced the stops 10 or so years ago and the thermostatic valve is tempormental. It's damage...