Common findings
- Uncoated brass flexible connectors. Older connectors can crack at the flare. The U.S. CPSC has warned about them, and replacement with modern coated connectors is cheap.
- Missing sediment traps at the gas inlet of furnaces and water heaters.
- Missing shutoff valves near the appliance.
- Venting problems: wrong slope, missing screws, backdrafting at a draft hood, or a vent too close to combustibles.
- Combustion air: closets that don’t allow enough air for the burner.
- Garage installations: appliances need protection from vehicles, and many need ignition sources raised at least 18 inches above the floor.
- Gas leaks: detected by smell, a bubble test or a combustible gas detector.
Shutoffs
The main gas shutoff is usually at the meter. Turning it a quarter turn so the tab is perpendicular to the pipe stops the flow. Only shut it off if you smell gas or there is damage, because the utility must restore service.
Seismic valves and flow valves
Seismic shutoff valves close automatically during strong shaking. Excess flow valves close when flow suddenly increases, as from a broken line. Installation requires a plumbing permit in most jurisdictions.
Gas versus all-electric
Many California cities now encourage or require all-electric new construction. Existing gas appliances remain legal, but if you plan to switch to heat pumps or induction, have an electrician check whether the panel has capacity.
Common questions
What should I do if I smell gas?
Leave the house right away, don't operate switches or phones inside, and call the gas utility or 911 from outside. Don't turn the gas back on yourself after it has been shut off; the utility relights appliances.
Are seismic gas shutoff valves required?
Not statewide for existing homes. Some cities and counties require them at sale, on new construction or during major remodels. Check your local building department.