Tex_n_cal, we have the types mounted on an outside wall and plumbed into the house instead of having the unit indoors.
They DO require a 3/4" gas line instead of a smaller line, and the temperature CAN be raised beyond 120F. There is a sequence of operation to allow this, but the water heater MUST NOT be operating to do it, and you can go to at least 140F with them. They are set with a default 120F to prevent scalding.
The smaller units come with thermocouples preset to certain temps and you just install the one that you want, the larger units can be changed via the keypad.
Ed
Thanks Ed - mine is on the outside wall, in the garage, obviously vented to the outside. It's probably ~40-50 feet from the master bath, just guessing.
I'm painting the garage floor this weekend; I'll try to snap some photos of it.
