Drolet Insert -good deal? osa?

I'm a newbie here, so any and all advice would be great.

My wife and I have taken advantage of the current state of the housing market and bought a house from a very motivated seller which would under normal circumstances been well beyond our means. I'm an avid DIY'er, so we're fixing up this gem of a home and plan to spend many years there. In the meantime however, I just paid a $460 electric bill to run my heat pumps through a rather cold January -- which in my opinion is just a tad high. So I'm looking into more economical ways to heat our castle.

I have over 2 acres of woods, with an abundance of fallen trees -- including a white oak we had to have cut down last summer which was hanging over our home threatening to split the house in half. It's over 75' long and about 5' diameter at the trunk. Needless to say, I pay my electric bill and look out the window at that monster oak tree laying there on the ground and think of how nice it would be to light her on fire a little bit at a time.

Our above grade sq footage is about 2500 sq-ft, so this would only serve as a supplemental heating source. This Drolet 1400-I wood insert seems like a good deal. The price tag seems fantastic. The only thing I can't tell from the site or even by reading the owners manual I downloaded from the manufacturer is whether or not an external fresh air source can be piped into it somehow. Based on everything I've read, getting an external air source is essential if I want to use this as a heater and not just for ambiance.

Does anyone know if fresh air can be routed to this unit or have any personal experience with it?

Thanks in advance,
David

That price seems high considering Northern tool is selling it for $599. Maybe not, how much does a liner usually cost?

I want the exterior air feed because I don't want to suck cold outside air into the house. Here's an interesting article about burning outside air versus burning inside air: http://www.chimneysweeponline.com/hooa.htm

I didn't realize how much the liners cost. So maybe that is a pretty good deal.

The biggest reason for the outside air kit -- as I understand it -- is to keep the stove from creating negative pressure inside the house thus pulling lots of cold air in. By adding an outside air feed, you basically create positive pressure via warming / expanding the inside air and essentially pushing warm air out the leaks instead of sucking cold combustion air in through the leaks.

I'm not sure I understand the humidity part of your post -- could you explain?

Also, what's PE?