Hello, I am trying to decide which insert fits my application better, the PE Pacific insert or the Summit. I have a ranch with a finished basement and will be heating the top floor. It is 1800 square feet on the top floor, and is of 70's origin with average insulation. I have a very large brick hearth in the middle of my house that has three flues. There is currently an older style fire place insert. The chimney is in good condition and is lined, and is 12x12. I am just wondering if the Summit will be overkill or the way to go. This heating season was 1000 gallons of oil so I am really looking to cut it down. Thanks.