I wired up a solid state relay to only turn on the hot water tank when electricity is cheapest. Using a 25 amp relay to switch about 22 amperes. I guess that was too close to it's rating. No issue for 4 months, then failed spectacularly.

My previous video of this set-up:
[ Ссылка ]

"bigclivedotcom" has done a teardown and analysis of one of these:
[ Ссылка ]

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