Casey Freswick
Senior Member
Is there a way to completely drain the fresh water tank under the sink?
What do you mean by completely? The TM's built in drains will leave about 1/4 inch of water in the tank, but this doesn't cause any problems.Is there a way to completely drain the fresh water tank under the sink?
Make sure the electric water heater switch within the outside door of the heater is turned off before draining, or you will kill the heating element if the trailer is plugged in while the water is drained. After draining all of the plumbing using the outside valves, open the left cabinet door under the sink. Grasp the PEX-to-threaded adaptor at the bottom front of the water heater. Turn it counterclockwise until it comes off of the water heater. Some remaining water should come out, and you can leave it open so the rest evaporates. Or you can put a tube through the hole and suck the water out of the bottom of the tank. There might be some sediment in the bottom.
No construction of additional accesses should be necessary for this. The inside fitting is where you can reach it, and comes off easily.
Replacing the kitchen faucet, on the other hand, is problematical. I understand why some have constructed access doors for that.
If I'm understanding correctly, I think the concern was to drain the fresh water tank, not the water heater tank.
The best bet is the marine access/clean out port. You can wet/dry vac the tank and wipe it out with a towel/paper towel to make sure it's completely empty & dry this way. I put mine on the top, but if I had to do it over again I'd put it on the side. There are links to who has used what, but there is one brand of port (at least) that can be placed on the side of the tank, and that one would allow an easier time reaching in with the towel to wipe down the inside of the tank -- it's a bit of a contortion to try to do it from the top...