If you use that hefty socket don't go Incredible Hulk & over tighten, the element has a rubber gasket & if crushed will never stop leaking, tighten snug, check for leaks & tighten a bit more if necessary. Might add a dab of plumbers grease (found at most hardware stores) to the gasket to keep it from trying to twist out while tightening.
Another thing to check. My Suburban water heater quit heating & found under the black reset cover for the 2 thermostats (1-120 volt & 1-12 volt) that the wires had gotten pinched between the cover & tank & had shorted burning the wires off the thermostat. I repaired the wires, replaced the thermostat, trimmed the cover a 1/4", & folded the metal lip down a bit, no more problems.
Also the anode should be checked periodically & depending on water quality & usage may need replaced annually, I always carry a spare.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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