first season adding canawick bricks,while not that cold so far in so. mass.,im really pleased how these have added to our comfort. i burn a jotul f100 and as we all know this is a small workhorse. i was never able to get long burns with split and always had to add wood after 5 to 6 hrs. at night. these brick maintain stove top @ 250-300 for 8+ hrs with draft closed. using six brick a night and 2500 sqft raised ranch more than comfy. this is not spam they really burn great for me, anybody else with similar experience.paid alot 250/ton but for what i'm getting from them great addition to splits and pallet wood. very little build up on the glass so they are clean up a lined chim