Heh Mark, very cool. Extremely doubtful that if One asked Takagi they would get an answer.
Do you (or anyone) possibly know what a "condensate trap" is? Don't think it's the same as the condensation drain discussed in this thread and mentioned elsewhere because the Rinnai RUR98i brags about having an internal one with a murky photo so doesn't seem like drain.
Also can't find out from takagi manual if the allowable input water temp can be altered as in using in solar hw systems. But, in the troubleshooting it implies such is possible because it gives "water input temp set to high" as a cause for heater not activating. So research is frustrating. Maybe someone here knows. Dread trying to ask Takagi.
Never owned a tankless before but here's something I learned today that might help others. YT--Sparky channel
Apparently when flushing with vinegar it is critical what you do before draining and it differs with different brands. For instance with Rheem must turn off power while hot water running or bypass valve won't open and vinegar won't enter HE sufficiently to clean. You believe erroneously that you have descaled it. Gives different directions for Rinnai and Noritz but no mention of Takagi and can't find mention anywhere else. If you guys know please pipe up. Don't want to buy such an expensive tool without knowing how to keep it slick. Directions elsewhere seem incomplete concerning said bypass valve and therefore dangerously wrong.
