It could be altered somewhat, but because we're home in the afternoon most of the time, it doesn't bother us too much to play. But the most negative fact is, if I don't take care of it 1st thing in the morning, by the time the wife comes home at noon, it'll "probably" be dead. Don't think she'll go 12 hrs, even on "super" slow. But I've gotten use to it, and compromises must be made to cut the oil bill "almost" in 1/2, and keep the house warmer.
The old Buderus Hand fed which is the European twin to what you have was close to what you have, maybe not quite so fussy but fussy nonetheless. The Keystoker 90 has been like heat from God. The Buderus oil boiler has not supplemented the coal heat for 3 years now. You might find yourself a little bored with a stoker but the savings will soon get you over the expense of a replacement unit.