[Flat Six]

Have had tankless (both Rinnai, RL94 like you have there) in our last couple of houses. So happy we did that.

Didn't do the recirculating pump in our last house, fixed that oversight in our current home. Ours is set to recirculate from 5a to 11p every day (I'm pretty sure every 15 minutes or so).

A couple of tips:

1) For interior units like yours (and mine), periodically remove the cover and blow out the unit as it'll collect dust (lots of that here in the desert) and -- in my case -- sawdust from woodworking projects.

2) Regularly de-scaling the water passages in the heat exchanger will help maintain the heat efficiency and longevity of your unit. Had to do it annually in Portland where we had moderately hard water; I suspect Beaux Arts to be similar. Here in Las Vegas the water is really hard, but since we feed the Rinnai w/softened water de-scaling once every two years feels about right. You should be able to get a copy of the annual water quality report from your water provider. Don't forget to check & clean the filter/strainer just above the cold water feed valve.

3) From what I hear the most likely malfunction is that the igniter will fail (it looks just like the one on my gas grill). If it ever malfunctions, it's pretty easy to replace. I was all set to do that a few weeks ago when ours tossed a code, but when I pulled the igniter it looked fine, just a little corroded/oxidized. Cleaned it up with some Scotchbrite and now is bueno.