Analog Above Ground Natural Gas Heater with Electric Ignition 105K BTUThe Raypak 106 is the perfect choice for above ground pools and spas. Raypak is the only manufacturer of this size heater to use all the engineering and components utilized in our bigger gas heaters. The unit is fully serviceable and built for years of operation. This may be our smallest pool and spa heater, but its built to the same exacting standards as the rest of our products. Extend your swim season, open your pool earlier and close it later.