Be careful! When I hooked up my genset the circulator hummed and the electronic controller had numbers dancing all over the place. I immediately disconnected it as I didn't want to loose my electronic equipment. That's when I got the wheelbarrow and pulled all the fuel I could out of the firebox. Right now I'm running a 1500 watt pure sine wave inverter/charger with the three deep cycle batteries out of my RV. I plan to install a Guardian when I feel richer.