Ultra-high performance in a compact, quiet, and eco-friendly design MasterTemp® Heaters offer all the efficiency, convenience, and reliability features you want in a pool heater, plus a lot more fast heat-up, compact design, super quiet operation, easy to use, and ecofriendly. MasterTemp high performanc eheaters offer best-in-class energy efficiency. Best-in-class energy efficiency Manual gas shut-off when service is required Eco-friendly MasterTemp® is certified for low NOx emission and outperforms industry standards Rotating digital display allows for easy viewing