It is the sediment in the bottom of the tank. When water heats it causes it to bubble and the sediment is causing it to be larger than normal bubble hence the thumping sound. On electric heater you can take out the bottom element and clean it our using a shop vac. Commercial gas heaters have an access panel that is for cleaning them out. Might look but I doubt your 40 gallon household heater has an access panel.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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