Water Heater Recirculation Pump Making Noise

I had a noisy hot water circulation pump after replacing a few other heating system components.

Water heater recirculation pump making noise.

The noise still starts every time the pump cycles on. This article describes how to diagnose fix noisy circulator pumps on hot water or hydronic heating systems. The noise coming from your recirculation pump could also mean that the bearings are wearing out in which case you will need to replace the pump before it completely fails. Low flow rate sometimes hot water recirculation pumps have small motors which are unable to produce sufficient head pressure.

Air in the line. Some water heaters have an exhaust blower and they can be a bit noisy. The air will need to be bled out of the system. Zone circulator pump repair procedures for noises.

Once again there are a few different things it could be. Such a blower would run whenever the water heater s burner is running which would occur from time to time anyway but especially after you ve used hot water. Install a water hammer arrestor between the offending device and the water heater. I have run 1000 experiments to try to figure out the problem.

Hot water recirculation pumps sometimes have a very small motor which means that they can t produce much head pressure. The pump has an internal check valve and there is a separate check valve on the cold water supply line to the water heater. This can be caused by a dishwasher or toilet bowl or by a water pump without a holding tank. The noise is not dangerous to your water heater but could lead to eventual wall damage if it is not corrected.

We distinguish among buzzing relays that control the circulator vibrating electric motors shrieking circulator bearings and circulator pump noises. If there has been a power outage or air has gotten into the line for some reason the pump can make a lot of noise. This made no sense since i didn t think i changed anything th. Many of these pumps can t even turn on a tankless heater.