When I turn on the Hot water in the bath tub, it barely runs, but sounds like a lot of water should be coming out. This is a garden tub in a trailer. The cold water comes out with plenty of pressure. What could be wrong with my hot water pressure and where is the water going if it is barely coming out??

Check the domestic water supply line going to the water heater. The pressure form the domestic water line into the water heater and hot water out of your faucet. The rumbling sound means the line form water heater is clear but the water doesn't comes out becoz, no pressure to push the hot water out. If you have a circulating pump in your hot water line, then the pump is the problem. Have a nice day.

The most likely thing is a build up of crud in the line. Shut the water off at at the stop under the sink. Pry the cap off the handle, remove the screw, and then the handle. There should be a nut. Remove it and you can pull the cartridge out. Hold a towel over the opening, and give it a shot of water from the stop. You may need to rinse some crud off the cartridge before putting it back together.

Nick, "the water doesnt comes out becoz, no pressure to push the hot water out. if you have a circulating pump in your hot water line, then the pump is the problem." One more time, Adding a recirculating pump WILL NOT increase volume or pressure. Again! You can not get more out of a system then you put into it. All a recirculating system does is move the water around in a pipe to replenish cold water with hot. It does NOT increase pressure or volume. Regards, Tom

I would check for a leak under the trailer, he said it sounds like water is flowing just not into the tub. 2 cents