Brand new theme pool heater whistles


Active member
Jul 10, 2018
Springfield, NJ
Hi just got a new rheem pool heater. After it starts up it starts to make a whistling sound like it’s haunted. I saw other thread where people have variable speed pumps and increased the speed to get rid of the sound. I have a single speed pump so I can’t increase the speed. I did notice if I play with the gas turn off valve the sound goes away. Did anyone who had this issue figure out what was wrong?


Active member
Jul 11, 2019
Yes, My Rheem heater did the same thing. Same exact sound, It's a flow issue. I had to increase my flow to 2800 RPM to make it go away. My PBl said he had to adjust the flow governor, which apparently worked because I no longer have the issue.