Aqua Comfort BZ140HC Blue Zebra Heat Pump - AquaComfort heat pump pool heaters are the result of more than 25 years of continued innovation in energy efficient technology. Designed, tested, and manufactured the most efficient, economical heat pumps you can buy. The cost to heat your pool with an AquaComfort pool heater is 80% less than a propane heater and 70% less than a natural gas heater.