I bought a harman p43 a few weeks ago. I have a 600 sf house and have heated with pellets only for 8 years now. I owned a vista flame before and never burned more than a bag a day even on the coldest days. Upon running this Harman it was IMPOSSIBLE to burn a bag a day no matter what the dials were on. It was burning about 2+ bags a day! At that rate I decided to bring the stove back and buy fuel oil.. this stove is NOT EFFICIENT AT ALL No star rating from me Junk don’t buy it!