I can get mine to pump some pretty serious heat but you have to have a aggressive fire going in it which means coaling fast too. And the difference from 0F to -20 to -40F is substantial. When it's very cold I can walk outside and hear the trees snapping from their moisture expanding. Same with the house. It snaps and at times loudly. But I will take a look at Hearthstones just for the heck of it as I'm not in any position to buy a different stove right now...what I need is to get my long awaited pension then get a cheap Toyota Echo to replace the Echo I have now that's been hit hard twice by bigger cars on run into two deer as of late.... and now I'm getting a new windshield on Monday due to the hood flying open at 75 MPH due to the last deer hit. Dang! It sure freaked out the dogs! Lol...