I just met a guy the next town over who has a Tarm Solo 40 and 1,200 gallons of storage in his basement. Since this is almost exactly what I was planning to install this summer, I went over to take a look. His house is 2,500 sf, built 6 years ago, with not too much glass. He heats it to 75 degrees, along with an 800 sf garage heated to 50 degrees, plus dhw. When I asked him how much wood he burned in a season, I just about slipped a disk: 16 cords. Could it be that bad? He's a retiree and loves nothing better that thinning out his 90 acres of ratty red maple. But I'm not ready to quit my day job - I was hoping to get away for about 6 to 8 cords per year. I noticed a few things right away (being a regular reader of this forum.) He's using standard baseboard heat, so he tries to keep his storage at 180 all the time. His tank (the foldable rubber ones that Tarm recommends) was warm to the touch, even in a 75-degree basement. And when I was there, the boiler was idling; he claims to stoke it three to four times per day, never letting it go out. (When he opened the door, I saw the creosote dripping down the inside of the fire box.) My question: could the aggregate of these various sins (high tank temp, poor tank insulation, and endless idling (I'll leave out the red maple and the house at 75)) add up to that much wood? Like many readers on this forum, I've been mightily impressed by reports of people heating similarly sized houses with 4 to 6 cords or so. But I'm skeptical that poor operating practices could be tripling his wood use, which makes me reconsider my enthusiasm for the going down the same road.