You can also incorporate an electric water heater into this type of system and use a
wind turbine or solar panels to power the system. With a well insulated shop floor
and building you can use the concrete floor as your storage system for the energy.
As long as you have wind or sun the energy is converted into heat which goes into
the concrete floor. You could also use this energy for a wood drying kiln if you ended
up with an excess of energy/heat from your system. A fan/coil unit can be easily
added to provide a forced air system for a small room.