winterize hot water heater?
I have a small hot water heater on a 1984 sailboat. I do not know how to winterize it. I see the hoses which probably pass the water to the engine for heating. I see what is probably the hose which am guessing adds water to the hot water heater. i see a hose which has two components (I am guessing this takes out water, one to the galley and one to the sink in the head). Then I see a spigot-like appendage on the hot water heater(doesn't appear to be at the bottom of the heater).
I was considering winterizing my head and water system myself, but I don't know what to do about this approx. 5 GAL water heater. There was not information left on the boat and the water heater itself had no instructions on it.......
Any ideas out there how to treat this unit? Advice much appreciated.