Type: Reliance Water Heater Thermopile Generator Replacement. 750 Millivolt. Models: Reliance Water Heater 300 Series Natural Gas Standard Tank and 400 Series Natural Gas Standard Tank. Highest quality replacement natural gas thermopile assembly for Reliance Water Heater Company part number 100112330 This is a 750 millivolt thermopile generator assembly that includes the pilot tube, and ferrule nut igniter wire. This natural gas thermopile replacement works for Reliance Water Heater 300 and 400 series natural gas standard tank water heaters. Highest quality replacement natural gas thermopile assembly for Reliance Water Heater Company part number 100112330. This is a 750 millivolt thermopile generator assembly that includes the pilot tube, and ferrule nut igniter wire. This natural gas thermopile replacement works for Reliance Water Heater 300 and 400 series natural gas standard tank water heaters. Our replacement thermopile comes with a 1 year manufacturer warranty.