Check the listing for details. Pentair MasterTemp 125 High Performance Natural Gas Heater, 15,000 Gal. Condition: New. Listed at 1759.00 USD. Pentair MasterTemp 125 High Performance Natural Gas Heater, 15,000 Gal Item Number: 924100 Item Features The MasterTemp® 125 Natural Gas Heater is for above ground and inground pools and spas up to 15,000 gallons. With a premixed gas combustion technology this heater offers 82% thermal efficiency along with the ease of use of its digital LCD display. It is compact and lightweight making installation simple along with its 1 ½ inch plumbing connection. This heater is certified for low NOx emissions and is certified for outdoor and indoor installations. Features: 82% thermal efficiency Natural Gas heater Digital LCD display 1 ½" plumbing connection Can be used for inground, above ground and spas up to 15,000 gallons Certified for low NOx emissions Lightweight at 80 lbs. ¾" gas line up to 50 ft. from source Certified for outdoor and indoor installations Benefits: High-Efficiency: The high performance heater uses pre-mixed gas combustion technology and offers 82% thermal efficiency. Ease of Use: Weighing 80 lbs. this heater is light and compact making storage and set up easy, the LCD display/controller allows for better control over the settings of the heater. Connections: The 1 ½" plumbing connection is ideal for smaller bodies of water such as above ground pools, spas and inground pools up to 15,000 gallons.