hal

2619er,  How much use has your hot water heater had.  It seems that with continued use, air pressure will be created. This air pressure, being that it it lighter than water will sit at the top of the heater tank.  This accumulation of air will continue until water is forced out of the overflow valve.  To stop this your tank needs to be bled of the air.

The overflow tank works differently on your trailer water heater as compared to the valve on the water tank in your home.  If your valve begins to leak at home, there is some particle caught in the valve.  Some plumbers recommend that you never release the safety valve on your home hot water heater as this could cause particles to seat where the seal is to sit, thus causing your tank to leak.  A leaky home water tank valve is a good one to replace as it could be getting ready to blow and run water throughout your house.

If water leaks out of the valve in your trailer's tank, it is a sign that there is too much air in the tank, as described above.  Most likely, your valve is still in good working condition.

You can find information on this in your Blue Notebook that came with your trailer.  If you don't have this book, let me know and I will scan the page and send it to you.

Hal