Originally Posted by AKRUEBBE
It's a Girard Model# GSWH-2
aka: Girard Tankless Water Heater Gen 3.
There are quite a few of us that still have it, had it (me included) and replaced it with a Truma (or other tankless model) or replaced it with a traditional tank heater.
There are also numerous write-ups and comments in this forum regarding the Girard and how to adjust/deal with all it's "quirks" to get satisfactory functionality out of it so I won't even try to go over all of it again.
Suffice it to say that there are some "adjustments" to be made when using compared to a traditional tanked heater, and they are NOT a good solution for water conservation such as dry camping, boondocking, or wanting to heat your water via electric to save propane. But if you stay/camp where you have full hookups, good water pressure and you learn how to actually use it within it's design limits, they can and do work well.