Legacy GE gas tanks are pre-2016 atmospheric or power-vent gas water heaters sold under the GE brand. Underlying manufacturing was Whirlpool through 2015; post-acquisition by Haier in 2016, Rheem became the OEM partner. Gas tanks have additional service complexity vs electric, primarily around the gas valve, thermocouple/thermopile, and venting.
Standing pilot vs electronic ignition
Most pre-2010 GE gas tanks used a standing pilot — small flame burning continuously, thermocouple senses flame and keeps gas valve open. Later legacy models switched to electronic intermittent pilot — flame only when burner is firing, sparked from a small igniter, sensed by a flame rod. Standing pilot is simpler to troubleshoot (visual flame check), electronic ignition is more efficient (no standby gas use) but requires diagnostic skill if it fails.
Common failure modes
Top three failures for legacy GE gas tanks, in order:
- Thermocouple/flame sensor: pilot lights but won't stay lit, or burner won't fire even with pilot. $20–40 part, 30-minute DIY for standing pilot; electronic ignition requires more diagnosis.
- Gas valve: won't open even with healthy pilot signal. $180–280 OEM, requires gas-fitter expertise.
- Pilot orifice clog: weak yellow pilot flame instead of steady blue. Clean with a needle or replace orifice.
Venting verification
Atmospheric vent (Type B chimney) — verify clearance from combustibles per local code (typically 6" minimum), proper rise (3/4" per foot of horizontal run minimum), and termination above roof line. Power vent — verify intake and exhaust paths clear, no obstruction, proper termination distance from windows and intake of nearby HVAC equipment.
Carbon monoxide considerations
Legacy gas tanks in unsealed spaces depend on adequate combustion air. Modern tight homes can starve atmospheric vent tanks, causing backdrafting — carbon monoxide spillage into the living space. If you install a CO detector near a legacy atmospheric gas tank and it triggers, the tank may need conversion to power vent or to a sealed combustion unit. This is not optional.
Lifespan and replacement timing
Legacy GE gas tanks typically reach 10–14 years. Anode rod inspection at year 5; gas valve replacement at year 8–10 is common. Past year 12, repair-or-replace typically favors replacement, especially given current options for higher-efficiency tankless and sealed-combustion power-vent units that eliminate the backdrafting risk.