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I am getting a high pitched whistle from my pipes. Whenever the circulator pumps turns on I hear it. I have written in this forum about this before and have done many things to correct it. I replaced...

Also what is the proper pressure in a two zone house system. I appreciate the help.

I was leaning towards the pump. It really isn't harmonic though. But if it was the system why would it be fine one day then two days later start whistleing?

But would that cause my whistle noise I am hearing. The floor gets very comfortable not uncomfortable hot. Regardless of the radiant heat I just said that to inform whomever would answer question....

If that's the case how much bigger pump should I get for it. And would running a pump dry make that whistle noise.

I recently added radiant flooring under my kitchen. All I did was remove a hot water baseboard and added this in the same loop. It added 200 feet of pipe to zone 1. I used the vapor barrier pex...

[b]I have a forced hot water heating system with two zones. Whenever the first zone demands heat I hear a high pitched whistle. It seems to be louder at the first baseboard in the loop. Do not hear...

I only seem to hear it in the room. I do not hear it near pump.

Two circulator pumps

I looked at the valve in line and it says universal flo chek. I unscrewed it and it still whistles. I can't find any valves like you have shown.

I don't know how to manually open zone. What does it look like? There is a big green thing in line. If that is it how do I manually open it. And there is no mixing valve in radiant floor heat.

I just checked and I brought it up to 15 psi and it still whistles. What is the proper way to purge system. I feel like there is not much pressure coming out of spigot. I recently install radiant...

What should the pressure be?

[B]I have a forced hot water heating system with two zones. Whenever the first zone demands heat I hear a high pitched whistle. It seems to be louder at the first baseboard in the loop. Do not hear...