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A mechanical 2 channel timer like the Screw*** one I suggested earlier (there are other types available) would I think do the job. I don't have personal experience of running a synchronous motor from a modified sine wave inverter, but the Crouzet type clock motors are usually pretty robust (other than in 3 port valves - which you don't have!)Would the mechanical clock/control s solve the problem?
Edit - I do see mention on a forum re off-grid users that mechanical timers in older (eg) washing machines are fine with MSW inverters.
If you normally have regular water and heating on/off periods every day of the week it would be a practical substitute. You might need to change the wiring onto the bracket that comes with a new timer.
But you did mention you would like a more powerful inverter, so a replacement 'pure sinewave' version might also solve the problem using your current timer, which still seems to be working!
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