If I were you I'd replace the pressurestat with a Sirai. Also, if I were doing it again I'd install a thermal safety switch with a manual reset. I think Doug has one that you could just attached to the boiler.
TWINS? As in human baby twins???
As for the safety fuse..a small bracket could be fabricated to attach a smooth face thermostat to one of the lower boiler bolts Ann wire it in on either wire of the heating element.
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