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Somebody asked for an electrician? How about one that also has an electrical engineering degree? Did this issue just start happening after the guy next door pulled the fuse? If so, then the most likely problem is with the fuse or the fuse holder. As stated in earlier post, be very careful when working on this system since one fuse clip will be HOT or energized when the fuse is pulled. If the old fuse shatted when extracted, then the clips holding the fuse probably have some corrosion on them and need to be cleaned (sandpaper, emory cloth, wire brush, whatever), JUST MAKE SURE THE POWER IS OFF TO THE ENTIRE PANEL BEFORE WORKING IN IT OR IT WILL KILL YOU (I know this is shouting but electrical safety is improtant to a continueing life). Clean the fuse holder clips, buy a good quality fuse and see if the problem goes away (or buy another cheap fuse with the hope that the problem goes away but be ready to buy a quality fuse if the cheapie blows as well). Any corrosion on the fuse clips will add resistance to the circuit which means the water heater is pulling more power to run which makes the fuse heat up and burn. Also as suggested earlier, make sure the wiring connections to the fuse holder are clean and tight. If this problem was present before the guy next door did his thing, then there are probably other contributing factors and we can go through them if needed.
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