Harman p61 and p68 have more btu but less heating capacity then the Regency, quadra fire 1200 and Mt vernon. Do harman heat less area or is. QF over estimating it's ability I am trying to heat as mush of 3000 sq ft colonel as possible. The less I have to turn on the oil furnace the better. The Harman is also $1500 more to install if I could get one.