I have a 40G water heater that rumbles and makes noise when running cold water in the faucet anywhere in the house. I had even flushed the tank to flush out sediment; however, the water had always been clear with no sign of sediment. Not sure why running cold water would induce rumbling noise. Any one knows?
Check and see if the cold water has been plumbed to the 'c' on the heater, the hot to the 'h', and the relief valve somewhere else, usually on the side. Maybe the plumber cheated somewhere to make installation easy.
Testimonial: "The pipes of release valve, cold water supply and hot water outlet are installed correctly. This is 10 years old water heater and have been working correctly. What happens is when I use cold water and cold water is running, the water heater rocks and rumbles. That sounds strange. What cold water has to do with water heater and rumbles the heater?"
SOURCE: Water is either hot or cold - no in between.
I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.
So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?
SOURCE: flush Rheemglas Fury 22VR75 yearly-increase life of H2O heater?
yes you will increase life if you flush sediment yearly
SOURCE: rheem tankless water heater error code C4 13??
check diaphrapm valve or micro/switch best of luck
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