Does anyone know of a 12 volt circulating pump? I'm going to add one parellel to my existing pump with valves to isolate. I was without electricty for 1 hr at -28 degrees with my Maxim 250 and had it go into overheat mode. It added water to put out fire. Then when power came back on the wet pellets froze in the transition between the two augers. One and one/half hours later I was back in business. With a 12 volt I'll just hook a battery and not overheat. I have a portable generator for use at the boiler. Thanks