A water heater igniter is the part that lights the gas burner, either with a glowing hot surface element or with a spark. When it fails, the burner never fires and you get lukewarm or cold water. The part is small, but the final price depends on the heater, the access and what else the technician finds.
This guide explains the cost drivers instead of quoting a number, because the real figure depends on your heater. It also starts with the one situation where you should not be reading at all.
If you smell gas, leave first
A rotten-egg smell near a gas water heater is not a cost question. Do not light anything, flip switches or use a phone inside. Leave the building, then call the gas utility or 911 from outside.
Both South Jersey Gas and PSE&G publish leave-first guidance for gas odors. Do not go back inside to look for the cause.
- 1Leave the building and take everyone with you.
- 2Call the gas utility or 911 from outside.
- 3Stay out until the utility or fire department says it is safe.
- 4Call a plumber only after the gas has been checked and cleared.
How the igniter fits into the heater
Newer gas tank heaters and many tankless units use an electronic igniter. A control board sends power to a hot surface element or a spark electrode. A flame sensor then confirms the burner lit. If the igniter is weak or cracked, the board tries several times and then locks out.
Older tanks use a standing pilot that is lit by hand or with a push-button piezo. That pilot assembly has a thermocouple, and it fails in a different way. Which system you have matters, because the parts and labor differ.
Symptom to likely cause
| Symptom | Likely culprit | Not the igniter if |
|---|---|---|
| Clicking, no flame (spark type) | Spark electrode dirty or gap off | Gas supply valve is closed |
| Glow, no ignition, then shutdown | Weak hot surface igniter | Burner is blocked or flooded with condensate |
| Pilot lights but dies when released | Failed thermocouple | You have an electronic ignition model |
| Error code on a display | Depends on the code | The manual says the code points to the venting or board |
| Water is warm but not hot | Sediment, thermostat or element | Heater is gas and the burner does fire |
Always check the model label and the manual before assuming the igniter is the problem.
What sets the price of an igniter job
No two igniter jobs cost the same, and a flat number on a web page can hide the details that move the bill.
Heater type and brand
Tank and tankless units use different igniters, and some brands use sealed assemblies that cost more than a loose element.
Part availability
A common igniter may be on the truck. A part for a discontinued or specialized unit may need ordering, which can add a second visit.
Diagnosis time
The same symptom can come from the igniter, the flame sensor, the gas valve, venting or a control board. Testing takes time, and it protects you from replacing the wrong part.
Access and location
A heater in a tight closet, attic or crawlspace takes longer to work on than one in an open basement.
Related condition
Sediment, corrosion, a flue problem or a leaking tank can change the answer from repair to replacement.
Timing
A scheduled appointment generally costs less than an after-hours emergency call.
Insurance note. Homeowner insurance may not cover a worn igniter because it is normal wear, so check your policy and any home warranty. Ask any plumber for a written, itemized price that separates the part, the labor and the diagnosis.
Repair the igniter or replace the heater
An igniter is usually a worthwhile repair on a heater that is otherwise sound. It is a poor investment on a tank that is failing.
Repair makes sense when
The tank is not leaking, has no heavy corrosion and was working well until the igniter stopped.
- Heater is in the middle of its service life
- Part is available
- No other faults found
Replace makes sense when
The tank is leaking, rusting at the base, or already needed other repairs.
- Tank is near the end of its life
- Repair cost is a large share of a new unit
- You want a different capacity or a tankless model
If the cost of the repair is a big share of a new heater, look at water heater replacement as a decision instead of paying to patch an old tank.
Gas safety in Voorhees, NJ homes
A gas appliance repair is one of the few household jobs where a mistake can hurt people. In Voorhees, the right first call for any gas smell is the gas utility or 911, not a plumber and not a neighbor.
Both South Jersey Gas and PSE&G tell customers to leave the building before calling. Look at your gas bill to confirm who serves your address, and keep that number somewhere you can find it.
Source type: South Jersey Gas and PSE&G published gas safety guidanceHow to compare igniter quotes
- ✓Does the quote name the heater model and the part number?
- ✓Is the diagnosis fee separate from the repair, and is it credited if you proceed?
- ✓Will the plumber test the flame sensor, gas valve and venting too?
- ✓Is the work done by a licensed plumber?
- ✓Does the quote say what happens if another fault is found?
- ✓Will the plumber leave the old part so you can see it?
What a licensed plumber will and will not do
You can safely check the obvious things at home: the thermostat setting, the breaker, the switch on the gas valve and whether the vent is blocked by stored items. Do not remove the burner access panel to work on a lit gas heater or rewire the control board.
A licensed plumber tests gas pressure, checks combustion and venting, replaces the igniter and confirms a clean burn. If the unit is old enough that the part is hard to find, they should tell you plainly. Our water heater repair visits start with this diagnosis for exactly that reason.
We handle the same calls for homeowners in Lindenwold and Gibbsboro. Urgent no-hot-water cases can use the 24/7 line.
Sources and references
The points above draw on these public standards, codes and guidelines. Rules change, so confirm current requirements with the agency or utility named before you rely on them.
- South Jersey Gas and PSE&G: published gas-leak safety guidance