Well, I don't know how new, or what type, of TT the OP has. But, I don't have a water heater by-pass on my 1993 TT. Winterizing takes 8 gallons of antifreeze and about 40 minutes to do by the time I drain everything, refill everything with antifreeze, and then drain everything again.
I know someone will say to add a by-pass and I could but, I would still have to remove the bed cushions and pull up the floor to access the back of the water heater each season. Plus, I'm afraid to add the by-pass myself for fear I will break the water heater or a line. So, I need to take it somewhere to have it done. The closest camper dealer that I would trust to do this job is 50 miles away. And, I would have to take a day off from work.
