Personally I'd go for the owned large tank. I wouldn't be able to stand the first time I couldn't use the spa and wanted to because we were out of propane. Heaven help me if it happened to the wife. If you do go with portable tanks I'd get two 40lb tanks (the same size as grill tanks just much taller) and an automatic switchover valve. Then when you notice the first one is empty (valve shows red) go get it filled. You can get all of this from an RV supply store.
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