After a lot of expensive experimentation on his part (I was an unintended guinea pig with my first liner) he settled on PVC liners and bought an expensive PVC welder to weld the liner. I think it comes down to, to do it right its pretty pricey tank and no that much demand.
If i were to be building a new house, I would pick up 550 gallon SS IBC tank and drop it in the basement then insulate it. They have a manhole on top that could be used to drop a coil inside and it could be run up to boiling. He used to use copper coils, but I think he switched to stainless. I will probably need a residential sprinkler system where I am planning to build so I could use the thermal storage tank as the backup tank for the sprinkler supply.
If i were to be building a new house, I would pick up 550 gallon SS IBC tank and drop it in the basement then insulate it. They have a manhole on top that could be used to drop a coil inside and it could be run up to boiling. He used to use copper coils, but I think he switched to stainless. I will probably need a residential sprinkler system where I am planning to build so I could use the thermal storage tank as the backup tank for the sprinkler supply.