Originally Posted by mbianka
I never had to deal with draining a hot water
tank myself. But, I'm thinking you might try hooking up a small wet dry vac (I find a 2 gallon Sears vac to be very useful on board) to the output hose of your water heater
and have it suck the water out of the tank. You probably should disconnect the input side of the tank when you do this so there is no chance that you collapse/damage the tank with the vacum. Then after draining the tank as much as possible if you place the tanks
inlet hose into a jug of anti freeze and use the wetdry vac on the output you should be able to see that you are sucking the anti freeze through the tank. You might find you need a lot less antifreeze
using this method. Just don't forget to hook the hoses back up when your done or you will be reminded in the spring by the sound of running water into the bilge
Anyway that's my thoughts on how to do it.
THE BIANKA LOG BLOG
I think that the wet dry vac is the simpliest method rather than redoing the plumbing
or trying to defeat that check valve. I have adapters for hooking up hoses directly to the faucets so I can attach the wet vac to the hot water faucet and then open up the cold faucet at the other sink to prevent any collaspe of the tubing. Don't think the old wet vac can pull that much vacumn, but you never know.
Thanks for the suggestion! I've already winterized the system for this year and wonder about the table showing dilution vs freeze points. The "pure" -50 degree pink stuff is already diluted coming straight from the bottle so not sure how that dilution table presented on this forum is to be applied?
Also someone asked about the check valve purpose...it is to provide protection from having the tank going dry which will burn out the heating