Raypak heaters are the leading name in pool heaters for a variety of reasons, and the ONLY heaters 4074 Pools and Spas recommends to our clients. Raypak heaters use cutting edge technology that produces a great product that is safe, efficient, and reliable! Raypak's digital heaters have an on demand ignition. When there is a call for heat, safety sensors are checked, an electric ignition ignites the pilot. Once the system acknowledges the lit pilot it opens the main gas valve for full burner ignition. There is no HSI or element to burn out over time, reducing maintenance cost. Additionally Raypak is now using cupro-nickle heat exchangers in all of their heaters instead of copper heat exchangers which are more durable and necessary for high corrosive environments like saltwater pools. Additionally, they now include a sacrificial metal anode on the header which offers a water bond, which provides further protection of the heat exchanger. Because there is not a sealed combustion chamber like competitors models (mastertemp, jxi, Sta rite max E Therm), the sulfuric acid created through the burning of natural gas, mixed with the condensation of exhaust gas, never drips down and gets captured on the heat exchanger, doing significant damage, and shortening the life of the heater. It is able to drip through to the burn pan and give the heater a long lasting reliable heater, with less long term maintenance costs. Additionally for indoor installations, they can be paired with the D-2 Power Ventilator which forces the exhaust gases out of the flue pipe quickly. This reduces the chance of condensation forming, as the hot exhaust gases travel along the cooler duct pipe, causing condensation to drip through the sulfur dioxide causing sulfuric acid to damage the heat exchanger. They are available in natural gas OR propane models. High altitude models are all we use in Denver and surrounding areas. Compatible with all automation controllers. ASME models available for commercial use as well as X94 models for high efficiency heating requirements.