My sister just bought a quad 60,000 BTU insert for $5,800 installed plus tax. She was heating her house using propane. She has a vaulted ceiling ranch about 2600 sqft. She put the stove on the main floor and is planning on using it as the primary means of heat. She bought 4 tons of pellets ($850) for the season. About how many years do you think it would take for her to pay for her initial investment? I told her at least 8 years, but I was just guessing. Does anyone know how many years it took to recoup the money they put into their stove plus install?