Pools, Spas and Hot Tubs Pool Energy Efficiency Keep your pool covered when not in use – uncovered pools can lose 30% of their heat, over 10,000 litres of water plus expensive chemicals monthly, just through evaporation. Consider a solar cover to heat the water’s surface. Run your pool pump for just 12 hours, instead of around the clock to save electricity. Inspect the pool heater every year to for scale, mineral deposits and corrosion. If your pool has a heater use a timer to preset the hours the pool is to be heated. When closing a pool, drain water from the heater, filter, pump and piping system. Remove the pump motor and store in a dry place.