I had a W/H tank spring a leak on a TT I had in the past (it was an Atwood W/H, similar to what we have in our motorhomes). It was a couple of pin holes in the tank bottom. I elected to replace the water heater. I guess it could have been welded (aluminum) but it was 8 years old at the time.
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA