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Originally, my heater was switched with a SSR. The relay was appropriately rated and should have worked perfectly.

Like you, I had a series of failures (no fires though) mostly open circuit. My pack runs at 220v and I am using a 4kw Dishwasher heater drawing about 20A.

After all the trouble, I swapped out the relay for a Kilovac contactor which has been trouble free.

I'm annoyed that I've been defeated by the SSR's - but glad I went for the Kilovac in the end!

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