Used for 1 year. Switching to solar. MasterTemp Heater - 250K BTU - Natural gas 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 eco-friendly. MasterTemp high performanc eheaters offer best-in-class energy efficiency. Plus, they are certified for low NOx emissions, making them eco-friendly favorites. That is why MasterTemp is an Eco Select brand product. MasterTemp - The Eco Select brand identifies our greenest and most efficient equipment choices. These products save energy, conserve water, eliminate noise, or otherwise contribute to a more environmentally responsible equipment system. Pentair MasterTemp Heaters - As the global leader in pool and spa equipment manufacturing, we strive to provide greener choices to our customers. We hope you will join us in embracing more eco-friendly poolscarpes by choosing Eco Select branded products for your swimming pool. MasterTemp Best-in-class energy efficiency High efficiency rating makes these heaters extremely economical to operate. If your pool heater is more than 5 years old, chances are a MasterTemp could quickly pay for itself in utility bill savings. Optimized fuel/air mix provides superior efficiency and faster heat up. MasterTemp Heater Certified for low NOx emissions In fact, our heaters outperform current industry standards for air pollustion exhaust. MasterTemp Heater Features Heats up fast so no long waits before enjoying your pool or spa 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 Tough, rustproof exterior handles the heat and weathers the elements Easy to install or retrofit in even the tightest space - models from 175K to 400K BTUs - all measure 21 L x 21 W x 28 H