Looking at buying a used Heritage stove. Tag on back says cartier 1 & 2 also petite. I think it's a 2 but don't know. Has anyone good or bad thoughts on this/these stoves. Heating 1200 ft up and down with stove in lower level and running furnace fan 24/7 to distribute air throughout. Looks in good shape. Also currently have a 40 yr old Fisher in excellent shape...any way of certifying these for insurance to approve? If not what's it worth...good for shop or camp.