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Only because I fiddled with a Sonoff in the middle did this problem start.
Perhaps the extra "narrowing" of the wiring?
If you have a clamp meter why don't you check what amperage the circuit is pulling when the geyser is heating up, if it is close to the 20A of the breaker that might be the problem? (Bypass the Sonoff then and test again.)
7 years is not that old, but for less than a R100 a new circuit breaker would at least rule out one item.

but in Pretoria East