I run a hot water boiler on propane - 100,000 btu for my house and have a 500 ga tank. Usually they only fill it up 60-70% to allow for expansion. About every other month they come and fill it up in the winter . I would think a 500 ga would be more than enough , just have put in 200 ga or so.
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Illinois Outlaw Gassers
6.27@107
9.97@131
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