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100 lbs propane tanks are pretty small, and therefore can only do so much before running out. If you use propane frequently, you’ll need to bump up to a larger size. Maybe look at the 100 gallon tank first.
The 100 lb tank is perfect for heating fireplaces, stoves and propane grills. Because of its smaller size, it can also be used in areas with restrictions. But it generally does not have a gauge to tell you how much propane remains. To resolve that issue, most people use two tanks and a regulator to switch over when the first one runs out.