I just moved into a single wide trailer I have a problem with my hot water tank there is very little hot water preasure. I have pleanty of hot water so I dont understand why there is no hot water preasure. I have cold water preasure but no hot water preasure. When I turn the water on I here air preasure in the lines. Please help cant figure it out not sure if I can do anything myself befoe I have to call a plumber and spend alot of money to fix my problem.