Most of my woodworking over the last 10 years or so has been between April/May to Sept/Oct time because the workshop got so bloody cold. I did try a calor gas heater one year but buying gas every week or so got expensive, another year I tried an electric oil-filled radiator to warm the place up a bit, but a £600+ bill in the following March put paid to that.
This year I've got a wood burner made from an old gas bottle and some old 4 inch cast-iron drainpipe for the flu. I've just finished installing it and been testing it out. It warms up the shop (small 26 x 10) within 1/2 an hour or so. I am so gonna have some quality time out there this winter and yeah I do have a BIG scrap wood pile to keep it going.
Yours nice & warm Mike