i keep my Rinnai on the lowest setting and it keeps it int he 45-50 degree range. I shut off the water pump but don't drain. When i changed from K1 to propane I had another heater put in the crawlspace to keep that warm but 2 of the last 3 years I haven't used it because the crawlspace(concrete block walls) has stayed around 40. Heated it for about $400 last winter but this year I think i'm going to drain completely and shut down.
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