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One of my customers is a summer camp. The cabins are occupied about 3 months of the year, with small retreats during the other 9 months. There are a lot of water heaters on the grounds, most of which are inside heated buildings. The few that are in unheated buildings get winterized, but the rest are left to run year round. How much fuel (LP) would be saved by shutting these units down during the off season?