Last year I did maintanence on my Kaa-2 by reaching into the boiler, running a drill bit through the holes, and a vaccume through were the pusher block is. What a Chore! This fall, 2 - nuts let the hopper come off. Two more let the stoker come completly out, once wires are disconnected. I went through the entire stoker assembly in no time. Hardly any fines under grates. That's the way to go. Way easyer than reaching through that little door, and trying to see in the dark. No cramps in the hands, and legs. No kinks in the back. No sore knees. And a though view/inspection of the entire unit. Easy to work on if need be. For summer shut down: Take the stove pipe off, and cap the smoke outlet. Put some insulation over the bottom hole of hopper. Then stick a small ceramic heater into the ash door during summer shut down. Works great! My ceramic heater has a thermostat, and actually shuts off.