Thank you all ......
Never had gas heaters in the past and as it is a relatively new place for us, not knowing what has been or not been serviced, we were looking to error on the safe side.
Same as we did when we got the fireplace chimney swept last Fall (-only to find it was in fine shape).
Regarding the Service Manual -- That is part of the problem as well. The Rinnai site does not have the manual for the specific model number of our unit. There are units looking similar, but not our specific version. Web searches have produced similar results.
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A bad day on the Big Lake (although I've never had one) - Still beats a day at the office!!
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