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 - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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