FeaturesElectronic ultra lownox gas control valve.300 series thermostat powered by 750 millivolt generator.Noticeable red led indicator light blinks 1 time at 3 second intervals during normal operation.Increased temperature control & accuracy.Integral spark igniter.Fits reliance standard natural gas water heaters with honeywell control.Dimension - 7 l x 12 w x 8 h in.Item weight - 2 lbs.