Well my garage is about 15x10 (maybe), and I am looking for a way to keep it warm in the winter. I was thinking about a rocket mass heater but I honestly am not worried about the mass parts that heats up and stays warm for a long time. I'm just looking to have it warm when I'm out there. Would it be useful to build the heater and just vent it out of my garage and not worry about the mass part? Would that work?