I almost didn't reply to your post, as I see you are looking for an auto feed (Stoker) stove, with very little BTU output capability. ............and if that's the case, you're covered.
However, I also see you're a "Wood Burner". Being a wood burner, that tells me you need to be informed / educated on burning coal, and coal stoves. A coal stove burns completely different than a wood stove. You'll have more control, longer burns, and way less work. For starters, I'm assuming you want to put your new coal stove in place of the wood stove, using the wood stove chimney.
Let me ask you this; If your power goes out, you have no oil furnace, correct? That's the nice part about the wood stove. It's a back up to your oil furnace. If you buy a "Stoker" coal stove, you've lost your back up. When the power goes out, so doesn't the stoker stove.
If you were to buy a hand fired coal stove, you'd still have your back up to the oil furnace. There are many hand fired coal stoves out there. I'm going to talk about the HITZER 30-95, as I've run one for years.
The HITZER 30-95 would fit your bill perfectly. It would be everything you'd want. Low BTU output when heat is not needed. Auto feed (Gravity Fed Hopper). Auto (Bi-Metallic) thermostat, along with ash pan door vents. Long burn times. Heat during power outage. Easy stove to run. No monkeying with it.
You have to do everything to a stoker, that you have to do to the HITZER 30-95. ........and that is; empty the ashes, and top off the hopper ( in that order). The only additional thing you need to do at tending time, is to shake the grate. That takes about 30 seconds. Maybe a minute. IF poking is needed, maybe another minute. NOT a big deal at all.
Here's the HITZER tending procedure:
1.) Empty the ashes from the previous tending.
2.) Shake the grate, and poke ONLY IF NEEDED.
3.) Top off the hopper with coal.
That's it! You don't touch the stove again for AT LEAST another 12 hours minimum. Every 12 hours is a nice schedule for hand fired stoves. During warmer outside temps, one could be stretched out to 24 hour tendings, as less BTU's are needed.
A bad part of stoker stoves in the living area is FAN NOISE. You have two fans. A combustion fan, and a circulator fan. You can not shut these fans off.
The HITZER 30-95 also has a fan. It's a circulator fan. It can be shut off, or not used at all. YOUR CHOICE. I would recommend getting the fan option, whether you use it or not.
The HITZER 50-93 is another great stove, that you can idle down low. Just not as low as the 30-95. The 30-95, with its single grate, concentrates the air flow to less coal.