I hate to be the Grimm Reaper here, but, contrair, contrair, a lot of variables even in coal units--wives calling hubby at work, hoppers all of a sudden catching fire, etc, etc. My Mom is 98 & I personally would be looking into something furnace wise, more efficient. I think that sometimes as avid coal burners, we might get a little stupid, sorry dlj, but how available is that Angel of yours, should a serious situation arise. And they do, sometimes arise.
I'd probably feel pretty bad if I burnt my mother up in the middle of the night--my only suggestion would be a Coal-Jack with it's safety features. Come on Jim D help me out here.