AJ Soprano
New Member
Not sure if this is the right place to ask this, but here goes. I have a natural gas pipe feed into the house which in feeds the furnace, gas fireplace, and hot water heater in that order. There are no leaks in the system. All 3 units have pilot lights that are continuously burning. When the hot water heater and the gas fireplace are running concurrently (i.e. the pilots have ignited the main burners), there is a resonating, medium-pitched hum that vibrates back through the gas line from the point where the feed splits off between the two appliances. I have read that this could be due to a change in gas velocity. Has anyone heard this or can anyone suggest how this hum may be prevented? I tend to think this may be the cause because shutting either burner down or igniting the furnace burner stops the hum.