If I extended my house to 13,000 Sq-Ft, I'd be looking at burning about 25 tons a year.
Yes, but to what standard? Some is pole and beam barn that is only heated to 60* and starts late and finishes early in the season. The second AnthraKing is only during really bitchy weather. No two installs are the same but the 4x multiplier over heating oil costs seems a given AND I'm a LOT warmer I'm sure of that.