Gentleman, seeing we're on the subject of the individual glass panes, I was told a good portion of the heat from these stoves, radiates thru these doors. Percentage wise, they say small #s, (like about 3%), but on my stove, when she's cooking, I feel a ton of heat coming out there. More than any other part of the stove. I can't hold my hand a foot away more than 5-10 seconds. So I did a little experiment today, and suspended a thermometer about 3" in frt of the glass for about 5-10 mins. Unfortunately the temp only went to about 350* max. Would it go higher if it was left longer? Didn't appear it would.
And how much does it affect the draft? Tonite, my manometer is reading -.05-.06. If I open the door a couple inches, it only drops about -.03 inches. So the concern about how much the small air gaps between the panes affect the draft? I would say minimal. But my 2nd stove had some severely distorted panes. So bad, I wouldn't even try to run them that bad. Woodsman has them for $6 a pop, so they are available. I had to do 6 of them on my stove.
I think our stoves are similar in burn times. My 513 will make OK heat, on med ( thermostat setting #1 1/2, on a single digit temp like tonite), and will run unattended for the same approx. 5-6 hrs, then will slowly slow down, and be retrievable in about 8-10 hrs. Not sure if I could save it in 12. My baro is my last course of action, to add a touch more life to this thing. It's roughly what the manufacturers rating is anyway, and I'm not expecting too much more from it. It isn't often some-one isn't home here, so if a little poking now and then, and top off the hopper is needed, I guess I'll live with it a while. As long as I can save it in the mornings, through these cold spells, it beats oiling the house.