At those temperatures, the Vigilant in your house,will be doing a whole lot more
than humming along ... it'll be screaming
Count on the oil burner to help it along - that's my bet! Keep the griddle in the low 700s and that'll be all it can give you. I put nearly 90 Lbs of coal a day thru running it like this. Have fun and hang onto your hat
Wow, that's a lot hotter than I want to run my stove. And 90 # a day! I don't think I break 500 F / 50# in the worst weather. How big is your house?
The point that the manual suggests to measure the stove temperature is on a cast iron griddle that's immediately above the fire.
The exhaust gasses hang out there and must go down a few inches to exit from the left or right sides of the stove, travel across the back of the stove before it can vent out the chimney pipe. Look at the top of the picture below and you'll see one side exit that the blue flames are headed to.
Recommended max operating temperature is 700. I've measured the side shelfs (stove's "shoulders") of the stove which would be where the exhaust enters the side chambers and it's around 550 in the middle. Yes, pushing thru 90 lbs a day is a maximum. If you do the math, it's about right considering 13,000 BTU per pound of coal.
13,000 * 90= 1,170,000 as a daily max.
Divide that by 24 hours for an hourly output from 90 lbs of coal: 1,170,000/24 = 48,750 BTU per hour.
For this sized stove, 50,000 BTU/hr. per Vermont Casting's literature, that's three refills and maybe just as many shakedowns depending on the ash content. Like you, I don't slice beneath/between the grates like nortcan does in his videos. Only when I feel there might be chruchy ash or clinkers holding ash back.
I'm putting the max heat from the Vigilant II into a ~ 3,100 ft^2 12 yr. old colonial. Heat moves around well enough w/o fans and gets to the second floor by a straight shot(one header in the stove room) across the ceiling into a large 17' high foyer that feeds all bedrooms. The far side of the house does get chilly (~60+) but we don't hang there much and prefer to "roost" in the stove room where it stays in the low 70s. Still, when it falls and stays in the low 20s and lower, my oil furnace runs. I use about 150 gal a year so I could use a stove big enough to put another 3/4 ton thru in the cold periods of winter.
The Vigilant II is very good at extracting heat from the fire and putting it into your space. Nortcan has a very efficient house and a well thought out system to distribute it evenly. Follow his threads on the modifications he needed to make and how his house is set up with an air handler and air to air heat exchanger. Now there's some follow through and employed technology doing the job EDIT:
My explaination above about max burn - using 90 lbs/day - only occurs when it's really cold outside. For NJ, that would be below 20 and into the single digits. I did not make this clear. The Vigilant controls air the air inlet thermostatically so it will only consume 90 lbs a day if it can shed the heat fast enough and on those days it does. I try to hold the temperature of the stovetop as shown, around 700 under those heating conditions.