I open a hot water tap in one of the sinks and turn off the water supply to the tank and then drain it about 10 inches. I close the drain, turn on the water to the tank and then I hear a loud thud and wa la, we have hot water pressure again.
SOURCE: On demand, tank less water heater
THE WATER IS RECIRCULATING IN THE UNIT. MAYBE CAUSED BY THE ACID. TRY INSTALLING A BACK FLOW PREVENTER
SOURCE: low pressure on hot water taps and showers
Many states building codes require a pressure regulator and expansion tank for hot water heater installation. Check the pressure regulator if you have one as this would only affect the hot water pressure. Adjust or replace. Rap the expansion tank like knocking hard on a door. Hollow sound is good. Dull thud means it needs to be replaced as it is filled with water.
SOURCE: No water pressure in bath tub after turning off hot water heater
It could be back flowing into the hot water heater tank which is not full because of the leak. Even though the valve is closed on the cold water entry side, there is probably no valve on the exit side. That is how it is returning to the tank.
Testimonial: "Thank you very much, Rick! "
SOURCE: I have a thermostat mixer shower but hot water has
The thermostatic mixing spool cartridge may be worn out. The low water pressure may indicate sediment in the cartridge as well. This can be easily removed by hand tools
SOURCE: I have a rheem hot water tank when you turn on the
Could be your thermostat but it might be your inlet dip tube. Your water heater has a plastic pipe that carries the cold water to the bottom of the tank. When you open your tap, it takes the hot water from the top of the tank, the cold goes to the bottem and gets heated. If this tube breaks, or comes loose, it will short circuit the cycle. The tank is hot but as soon as you start using water, cold water comes in at the top and mixes with your hot water, giving you just warm water. If you have room above your tank, you can remove the union on the cold side , screw out the pipe nipple, and look inside and see if there is a tube. If not you can buy one from home depot or lowes for just a few dollars. Also a water heater should be partially drained annually to remove any solids from the bottom, which will allow better heat transfer.If you find bits of plastic when you do, then you know where your dip tube went. Also if you've had a hot water faucet stop up and it looked like plastic there it is.
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