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My old weil-McClain No. 57 oil burner started having pressure problems, and now they say there is a pinhole in the tankless coil. Because the 16 bolts that hold it on are so corroded and would probably have to be drilled out at high labor expense, they are saying I should: get a new boiler, get an add on system or get an electric water heater (which would require upping my electrical box from 100 amp service to 200.) As all of these options are expensive and what I know about these systems would fit in a thimble, cand anyone give me some advice? Before this happened they always said my boiler was great and they don't make 'em like this anymore. It was here when we bought the house 25 years ago and has been regularly cleaned and maintained.