I would wonder if you could use a Marine 12V battery w/ a 6W solar panel to charge it during the day and run the pump. Using a 75W or more Inverter.
Inverter 11-1839-4 = $29.99
Marine Battery 10-2499-8 = $89.99
5.5W Solar Panel 11-1884-4 = $89.99
Using a Deep Cycle battery (Big Drain and Charge) it can run a heater and pump all night and almost drain, then charge during the day. You just need to be sure that your solar panel is going to handle running the devices AND trickle charge your Marine Battery at the same time.
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"what do you mean you need another tank??"
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