I was thinking more something like this:
My uncle is an electrician and told me he would install a surge protector for the whole electrical panel that goes in the top slot of each bus on the panel. But that won't help with voltage regulation, only spikes.
I haven't been able to find any economically priced hardwired voltage regulators. Is it acceptable to wire a standard 3 prong plug on to my feed to the boiler and plug it into this before going to the cutoff switch?