A simple difference in terminology from "tankless" to "on demand" and the Truma AquaGo Comfort enters the picture.
They are expensive compared to most other WH's, tankless or not, but for those of us that have one, they are the answer we have been looking for.
If you truly want to stick with an "on demand", unlimited hot water solution, you need to take a look at the Truma. Have had ours now for a few months and they truly are what people say they are.
Work on 1/4 the water flow required for the Girard.
Eliminate the "cold water sandwich" when turning hot off and on again. (Comfort model/setting)
Easy "end user" descaling and maintenance.
60,000 BTU burner can heat even the coldest source water.
Can run hot water at the faucet literally at a trickle.
Can mix as much cold as you want.
I could go on, but you get the picture.
2018 GMC Sierra Denali 4WD LB SRW 6.6L Duramax
2017 Jayco Eagle 330RSTS