The hot water test provides a simple way to estimate propane in a tank by exploiting heat absorption differences. Pour hot water down the side of a closed, cool tank and then feel the metal: the upper, empty section warms quickly, while the portion in contact with liquid propane stays noticeably cooler. Liquid propane absorbs and disperses heat, producing a distinct cool band that indicates remaining fuel. The method requires the valve to be closed and caution with very hot water, and it offers a reliable DIY gauge without special tools.
There is nothing more deflating during grill season than carrying a tray of burgers and hot dogs to the grill just to find that the propane is out. Propane tanks don't come with a fuel gauge, which makes it tricky to tell how much gas is left - especially if you haven't used the grill in a while. But there's a surprisingly simple trick (one of the most essential grill tips and tricks) that can help: the hot water test.
Start by heating some water. It doesn't need to be boiling - hot tap water is usually sufficient - but if it is freshly boiled, handle it carefully. With the propane tank completely turned off and cool to the touch, pour the hot water slowly down the side. Then run your hand down the same side of the tank. The metal will feel warm everywhere there's air, but you'll hit a distinct cool zone where there's still liquid propane inside.
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