Try a Google of "thermosyphon reboiler", that looks like the schematic, and with sufficient heat input would set up the recirculation without the pump. I expect the pump could be left in the circuit for the mashing step. I would consider returning the boil loop directly into the main pot...
1171 + 5 = 1176
Has been bubbling for 5 days, and still going strong. Gravity sample tasted great, but sweet. I used 90L, 3.1 AA hops, and boiled a bit longer to reduce some volume since I added extra water.