You are keeping your mother happy, very nice of you.
Do you live with or live close?
How often you tend the ashes?
Good on your part, hope many good things come your way.
A Coal stoker furnace or stove controls most operations including automatically feeding the coal. They are quite similar to any conventional oil and gas units and easily operated for extended periods of time. They commonly use rice coal but may use larger sizes like buckwheat. They can be used as primary heat, supplementary heat or have a dual set up with your existing oil/gas furnace.