The water pump can pump just about forever without overheating. It can do so even after you run out of water. I once left mine on (in a small camper) and had a small leak I didn't know about. A week later the tank was empty and the pump still running dry. If I hadn't been on shore power the battery would have run down. The pump wasn't harmed in any way. Just as the manufacturer claims, it can run until it wears out, which might take years.
The pump isn't water-cooled. The motor is air-cooled, and the diaphragm that actually does the pumping doesn't develop significant heat. Neither do the valves.
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-- Carl
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