LARNTV399NXX3,

NeoTherm is a direct vent, sealed combustion, condensing hydronic boiler or volume water heater with up to 96% thermal efficiency that modulates with a 5 to 1 turndown. It features an ASME stainless steel heat exchanger, spark ignition system and low NOx emissions (less than 10 ppm), for a package that's easy to use, and easy on the environment. NeoTherm is built standard with the new LAARS Integrated Control System that puts the ignition control, temperature control and high limit into one user-friendly device that does it all with an easy to use, large color touch screen interface. The PID control system has frost protection, and loads of other features.