The answer is: nothing good. For starters, you'll absolutely need to keep your pool pump running almost nonstop all winter to try to prevent freezing pipes, and that gets expensive quickly. Freezing can damage pipes, pumps, pool heaters, and the pool itself. Pipes embedded under a concrete...
A flow sensor for a pool heater monitors the passage of water through the pipe to the heater. If water flow is interrupted, the sensor signals the heater to shut off. Pool heaters are designed to operate only when water flows through the system. Running a pool heater dry can damage or b...