Looking for info on HTP Everlast water heaters. Do they also have expansion tanks? How is parts and technician availability? Want something the average plumber will know how to work on and can easily get parts for. Willing to spend 1.5 to 2x what a Bradford White would cost. Planning to have a new 40 gallon electric water heater installed. If it will last 20 plus years cost to own would lower than 2 water heaters and 2 installs.