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post #5 of Old 03-23-2009
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Try this link: BTU Calculator - Artful Dodger's number is probably pretty close (maybe even high). I just put a 17,000 BTU Espar Hydronic unit in my Catalina 310. Fired it up the first time this weekend, and it appears MORE than enough, and I am also heating the hot water (20 gallons).
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