I wanted a Truma, although I wanted a Varioheat (air only)...because Propex seemed “behind the times,” Webasto / Espar too finicky / prone to fail, and legitimate (supported) Combi was too expensive...though that was before this “alternative sourced” Combi’s came to my attention. All that said, I could have bought a “grey-market” Varioheat, or even its E2400 predecessor, but I valued a support channel in USA, and Truma-from-Europe pricing was still not that great. As mentioned previously, the real Truma USA won’t deal with DIY’ers, and didn’t bring the Varioheat or E2400 to USA (except MAYBE to LARGE RV manufacturers like Winnebago or Forest River...who actually only install Combi’s from the looks of things).. So no luck for scum like me.
Good luck to you with this “grey market” Combi, seriously. Had I known about it at the time, at today’s pricing, I might have sprung for it.
As it is, I bought a Propex 2211, though a year later it is still not installed. Long story (started install, then removed). I wanted underfloor install, to save space, and keep all combustion out of the interior, though not sure I will be saving much usable space...though hopefully still safer than interior-mounted combustion heaters. I absolutely consider my decision a compromise. Again good luck with grey-market Truma’s. FWIW, Varioheat are super efficient with electricity and propane, Combi’s (and Propex) not as much. To their credit, Webasto & Espar appear super efficient...until they fail. All I can do at this point is HOPE the Propex doesn’t fail, and HOPE it is safe in DIY install.
2015 Tall, Medium Length, Cargo, 3.5EB, pretty generic-looking, DIY camper