The Rheem Performance Plus 40 Gal. Liquid Propane Tall Water Heater comes with a 36,000 BTU/hour burner that provides ample hot water for households with 2 to 4 people. The push button ignition system ensures safe and easy startup. Its maintenance free combustion air intake system means there are no filters to clean and replace. The self-diagnostic gas valve monitors system Performance. A premium grade anode rod provides long lasting tank protection. Factory installed temperature and pressure relief valve and 3/4 in. water connections are included with the water heater for easy installation.