Why Is My Gas Water Heater Not Sparking? Exact Igniter Gap Specs for Rheem, A.O. Smith, and Bradford White
Ignition failure in eco-friendly gas water heaters during the summer months is frequently resolved by precisely calibrating the spark gap between the electrode and burner to the manufacturer-specified dimensions in inches and millimeters. Leading North American brands—Rheem, A.O. Smith, and Bradford White—utilize distinct, proprietary piezo igniter specifications, meaning that modifying aftermarket parts arbitrarily will fail to restore proper function. Quick Reference: OEM Spark Gap Specifications Rheem Performance Platinum - Target Gap: 3.18mm (0.125 in. / 1/8 in.) - Critical Note: Gaps over 3.5mm trigger automatic system lockout via the gas control valve. A.O. Smith Signature - Target Gap: 3.96mm (0.156 in. / 5/32 in.) - Critical Note: Highly sensitive to humidity; avoid using harsh abrasives on the coated tip. Bradford White Defender - Target Gap: 2.77mm (0.109 in. / 7/64 i...