Gas Water Heater Repair — Nationwide
Pilot light out, no hot water, or a burner that won’t stay lit? LocalPlumber.us connects homeowners across the USA with vetted, insured local plumbers who repair gas water heaters — natural gas or propane, pilot or electronic ignition. If you smell gas, leave the home first and call your gas utility or 911; for everything else, call now, enter your ZIP when prompted, and stay on the line.
If You Smell Gas, Stop Here First
A rotten-egg smell in the air near the water heater is not a repair call — it’s an emergency. Don’t light anything, don’t flip switches, leave the home, and call your gas utility’s emergency line or 911 from outside. Once the utility has cleared the home, the water heater can be inspected and repaired.
What Goes Wrong With a Gas Water Heater
| What You See | Common Cause | Typical Fix |
|---|---|---|
| Pilot light keeps going out | Worn thermocouple or thermopile, dirty pilot orifice, or a draft at the burner | Replace the sensor, clean the pilot assembly |
| No hot water, but the pilot is lit | Failed gas control valve or thermostat, or a tripped safety device | Valve or thermostat replacement |
| Not enough hot water | Sediment buildup, a failed dip tube, or a thermostat set too low | Flush the tank, replace the dip tube |
| Rumbling or popping noises | Hardened sediment on the tank floor | Flush; replace the unit if the sediment is severe |
| Hot water (only) smells like rotten eggs | Bacteria reacting with the tank’s anode rod | Anode rod replacement and a disinfecting flush |
| Soot, scorch marks, or a yellow, lazy flame | Poor combustion or a blocked flue — a safety issue | Stop using it; inspect the burner and venting |
| Water pooling around the base | A failing drain or relief valve — or a leaking tank | Valve repair, or replacement if the tank itself leaks |
Pilot Light or Electronic Ignition: Why It Changes the Repair
Older gas tank heaters use a standing pilot flame and a thermocouple; most newer units light the burner electronically. Standing-pilot problems are usually mechanical — a weak thermocouple, a clogged pilot tube, a draft. Electronic-ignition units add a control board, igniter, and sensors, so a “won’t light” complaint can come from electronics rather than gas flow. Knowing which type you have, which the label on the tank states, shortens the diagnosis.
Venting and Backdrafting: The Problem Nobody Notices
A gas water heater has to exhaust combustion gases up the flue. When the flue is blocked, disconnected, or starved of air — after a new roof, a bird nest, or tighter windows — exhaust can spill back into the home. Warning signs include soot around the draft hood, rust streaks on the flue pipe, a flame that flutters or leans, and a carbon monoxide alarm going off. These are not “fix it later” items. For other plumbing concerns around the home, see Residential Plumbing Services.
What a Gas Water Heater Repair Visit Typically Includes
- A gas-leak check at the connections and the control valve
- Cleaning the burner and pilot assembly
- Testing the thermocouple or thermopile and the igniter
- Checking the gas control valve and the thermostat
- Testing the temperature-and-pressure relief valve
- Inspecting the flue and draft for blockage or backdrafting
- Flushing sediment and inspecting the anode rod
Repair or Replace a Gas Water Heater?
Gas tank units typically last 8–12 years. A failed part on a younger unit — a thermocouple, a thermostat, a relief valve — is usually worth repairing. A leaking tank, or a unit past 10 years that keeps having problems, usually isn’t worth another repair: a tank leak can’t be fixed, only replaced. Ask for both options in writing before you approve anything. Tankless gas units follow a different diagnostic path — see Tankless Water Heater Repair — and a heater that has failed completely and left the home without hot water may fall under Emergency Plumbing.
What Happens When You Call
Call now and give your ZIP code when prompted, then stay on the line — it may ring for a moment and the call may be recorded. When someone answers, describe the problem, ask for a written price and a time window, and book it; nothing is scheduled until you agree. See the full process →
Who This Is For — and Who It Isn’t
A good fit: a gas tank water heater (natural gas or propane) with pilot, ignition, heating, noise, or sediment problems.
Not the right fit: a gas smell — call your gas utility or 911 first — plus tankless units (see Tankless Water Heater Repair), electric tank heaters (see Water Heater Repair), and large commercial boiler systems.
Frequently Asked Questions — Gas Water Heater Repair
Why does my gas water heater pilot light keep going out?
The usual culprits are a worn thermocouple or thermopile that no longer senses the flame, a dirty pilot orifice, or a draft blowing at the burner. Relighting it over and over without fixing the cause only delays the next outage.
Is it safe to relight a gas water heater pilot myself?
Many manufacturers print relighting steps on the unit, and if you smell no gas, following them exactly is generally considered safe. If the pilot won’t stay lit, or you smell gas at any point, stop and call a plumber or your gas utility.
What does a rotten-egg smell from my hot water mean?
If it’s only in the hot water, it’s usually bacteria reacting with the tank’s anode rod — fixable with a flush and a new rod. If you smell it in the air around the heater, that may be natural gas: leave the home and call your gas utility or 911.
How long does a gas water heater last?
Most tank-style gas heaters last 8–12 years. Flushing the tank once a year and replacing the anode rod when it’s used up helps a unit reach the longer end of that range.
Should I have a carbon monoxide detector near my gas water heater?
Yes. Any gas appliance can produce carbon monoxide if combustion or venting goes wrong, and a working CO alarm on each level of the home — especially near bedrooms — is standard safety guidance.
Why does my gas water heater make a popping or rumbling noise?
That sound is usually water trapped under a layer of hardened sediment, boiling and escaping around it. A tank flush often quiets it. If the sediment has hardened badly, the burner is heating through a layer of it and the tank bottom runs hot, which is a sign the tank may be near the end of its life.
What is the temperature-and-pressure relief valve on a gas water heater for?
It’s a safety valve that opens if the tank gets too hot or the pressure climbs too high, releasing water through a discharge pipe. If it drips constantly or won’t release when tested, it needs attention — and it should never be capped or plugged.
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