This Navien Ignition Transformer is a key component in Navien's NPN series of tankless water heaters. The transformer's primary function is to provide the necessary voltage to ignite the gas within the unit, initiating the heating process. It operates at a frequency of 60 Hz and an input voltage of 120V, converting it to an output voltage of 10,000V. The product dimensions are approximately 3.5" x 2.5" x 2", making it compact enough to fit within the water heater unit without taking up excessive space.