Oh, the pumps...run two tee'd into the same return. If one fails, you still have 50% flow, better than no flow
I wouldn't be home to fire up the generator though in some cases. I'll try to find a battery back up I suppose.The reason to run two heaters is more for if a heater sticks on. If you run on heater and it sticks on, it will cook your fish. I've had many heaters malfunction over the years, and usually they stick on, not just quit, although that happens too. I set both (or 3 or 4!) to the same temp. If on sticks, the other will stay off. If one quits, the other will at least give you some heat. A generator is the best back-up in case of power failure
So the primary tees into return #1&2 and the back up just feeds #2? I would need a check valve on both pump outlets to prevent them from pumping into one another correct? And would they both be running at the same strength? For a 305 gallon at 6x/hr water turnover I would need an 1830GPH sump correct? Would both be rated the same? Sorry I'm such a noobOh, the pumps...run two tee'd into the same return. If one fails, you still have 50% flow, better than no flow
Look into a controller for your heaters i use ranco but others have had success with inkbird.