I just bought a used camper that's in excellent condition, I just have one problem...the water heater. The tank gets hot and every now and then you get a burst of hot water. The guy I bought it from said he had a problem with the check valve on the top. I replaced the check valve today and it's still just giving me a burst of hot water when I turn it on the goes back to cold. Any help would be greatly appreciated! Thank you.
Are you sure the outside shower (or inside) doesn't have the valves open but the showerhead closed? That is a frequent issue that "short circuits" the hot water.