I am skeptical that many heating elements are going bad, I have experienced any going bad on my elect. water heaters in 40 years. They rust out the bottom first or fill up with crap from the water I have saved several heating elements for old water heaters thinking I may need them but so far I haven't. I would have electrician inspect the wiring set up. probably pulling too many amps for the circuit or corrosion reducing the ampere flow thus busting the screw in fuses is my guess
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