Who all is using electric for backup? Like either an electric boiler, or a tank with elements in it. I've been almost set on getting a new compact oil boiler for backup, but with the ever changing price of oil (not that electricity is cheap & stable itself though), and how little I HOPE to be having to use back up, and the thoughts of getting totally rid of oil furnace/tank etc. - well, I'm having second thoughts on it. There seem to be a few fairly new second hand electric boilers around - Thermolec, Slant Fin - are there good & bad? Those who use it, what are your setups and the goods & bads?