As for the combi, I'm glad to hear it. Personally I wouldn't spend that much cheddar on something I have heard bad reviews on at all.
I am really disappointed that after all of this chatter you still feel you have heard bad reviews on the Truma Combi, so I have done a bit of research, and the only place I can find negative reviews on a Truma product is on Sprinter-Source. All of the issues you described are there for the
Truma Aquago tankless water heater, not the combi.
This is a completely different category of product, and the issues described are for a first generation device that is only manufactured for the US market with the Truma name. Please do not confuse the two. But you are not wrong, you are just applying your opinions to the
wrong product. The Aquago did indeed have some leaking and water heating issues.