I feel your pain, there have been many threads recently on this topic as I had the same questions.
https://www.quiltingboard.com/vbulle...r-t318260.html
https://www.quiltingboard.com/vbulle...r-t315157.html
I am currently on the fence, a new one is 1800.00, and a tankless system was quoted between 4-5k here in Ohio.