I will use a timer you would use to turn house lights on off . It will be be programmed off 10 min . for every 3 hours 24/7 . A thermostat connected in parallel will hold power on always if boiler room is above 55F. Power will only shut down for 10 min. if room is abnormally cold as a backup reset action .
In my day job , I go around installing caps on solenoids which cause transient spikes that corrupt micros in industrial machines . I will not modify anything in the boiler for legal reasons but I will plug the power cord into a surge suppressor and set up my power cord backup 10 min. power off reset system .