If boiler and water heat are electric, it will use a LOT of power. A boiler could easily pull 3-5,000 watts or more if it was electric.
The big natural gas genny that Costco is selling is actually a bargain. It puts out 50 amps and provides seamless switchover when utility power is interrupted. It is tied directly into the house mains so its like nothing even happened when the power goes down. That's what I would do if I was concerned about periodic storm outages.
Last edited by voip-ninja; 11-13-2012 at 10:45 PM.