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Silicon nitride and silicon carbide HSIs crack from skin-oil contamination at operating temperature. Handle by the ceramic base, never the white/grey heating element. If you brush it, wipe with isopropyl alcohol before install.
Silicon nitride vs silicon carbide, which one you want
| Property | Silicon Carbide | Silicon Nitride |
|---|---|---|
| Lifespan | 3-5 yrs | 7-15 yrs |
| Time to operating temp | ~17 sec | ~17 sec |
| Amp draw | 3-4A | 1-2A (lower) |
| Cycle rating | ~40,000 cycles | 60,000+ cycles |
| Crack resistance | Lower (thermal shock) | Higher |
| Price (universal kit) | $15-$25 | $40-$55 |
Pick silicon nitride if you have the choice. The $25 premium pays for itself the first time you don't repeat this job.
The 5 universal furnace igniters worth installing in 2026 (ranked)
1. Best silicon nitride universal: Honeywell Q3200U1004 Glowfly
Silicon nitride means 7-15 years instead of the 3-5 you'd get from carbide. The Glowfly kit ships with six brackets, so it doesn't care if your furnace is a Carrier flat-blade or a Goodman round-rod. The cross-reference card alone earns its price, you'll match your old part in two minutes.
| Spec | Value |
|---|---|
| Material | Silicon nitride |
| Voltage | 120 VAC |
| Mount | 6 bracket configs included |
| Cross-refs | 110+ OEM models |
| Pricing tier | Mid-range · Check live price |
- Honeywell Q3200U1004 Glowfly on Amazon — check current price on Amazon
2. Best silicon carbide (legacy): Robertshaw 41-409
If your furnace is a pre-2010 Norton-style application and you want like-for-like, this is the carbide everybody stocks. Same 17-second light-off, same 40-90 ohm cold-resistance window. Just know you're buying 3-5 years of life, not the decade you'd get from nitride. Cheap enough to be the "I just need heat tonight" answer.
| Spec | Value |
|---|---|
| Material | Silicon carbide (recrystallized) |
| Voltage | 120 VAC |
| Time-to-temp | <17 sec |
| Cold resistance | 40-90 Ω |
| Pricing tier | Mid-range · Check live price |
- Robertshaw 41-409 on Amazon — check current price on Amazon
3. Best OEM brand-specific: Carrier LH33ZS001 / LH33ZS004
If your furnace is a Carrier-family unit (includes Bryant and Payne, same parent), the LH33ZS001 is the OEM nitride that came in it. Supersession is LH33ZS004, buy that one and you're future-proofed. Plug-in mount, no wiring splice, two-minute swap. Aftermarket equivalent goes for half the price, but if you're already buying it yourself, the $10 OEM premium is worth peace of mind.
| Spec | Value |
|---|---|
| Material | Silicon nitride (ceramic) |
| Voltage | 120 VAC |
| Mount | Plug-in (2" base × 3" total) |
| Fits | Carrier, Bryant, Payne |
| Aftermarket cross | LH33ZS004 supersedes |
- Carrier LH33ZS004 on Amazon — check current price on Amazon
4. Best Norton 271N-style: Robertshaw 41-408
The Norton 271 family is everywhere: York, Coleman, Evcon, Nordyne all spec it. The Robertshaw 41-408 is the cleanest cross. Same 18-gauge nickel-chrome leads, same fiberglass insulation, same 17-second time-to-temp. If your old igniter said "271N" on the ceramic, this is your part.
| Spec | Value |
|---|---|
| Material | Silicon carbide |
| Voltage | 120 VAC |
| Lead length | 5.25" |
| Replaces | Norton 271D / 271M / 271N / 271W |
| Pricing tier | Mid-range · Check live price |
- Robertshaw 41-408 on Amazon — check current price on Amazon
5. Best budget aftermarket: Supco SIG1100 Universal Kit
Supco built a parts business on budget gear that works. The SIG1100 is the contractor's "I don't know what's in this furnace yet" kit, round carbide rod, full bracket set, fits hundreds of cross-references. It's carbide, so plan on swapping again in 4 years, but at sub-$30 with hardware included, it's the right answer when the OEM is on backorder.
| Spec | Value |
|---|---|
| Material | Silicon carbide |
| Voltage | 120 VAC |
| Mount | Universal bracket kit |
| OEM cross-refs | "Hundreds" per Supco |
| Pricing tier | Mid-range · Check live price |
- Supco SIG1100 on Amazon — check current price on Amazon
Compatibility table
| OEM Family | OEM Part | Universal Pick (Nitride) | Universal Pick (Carbide) |
|---|---|---|---|
| Carrier / Bryant / Payne | LH33ZS001 / LH33ZS004 | Honeywell Q3200U1004 | Robertshaw 41-409 |
| Goodman / Amana | B1401015S | Honeywell Q3200U1004 | Supco SIG1100 |
| Lennox (legacy 26H37) | 26H37 / 19W61 | Honeywell Q3200U1004 + bracket | Robertshaw 41-409 |
| Trane / American Standard | IGN00001 / IGN00031 | Honeywell Q3200U1004 | Supco SIG1100 |
| Rheem / Ruud | 62-22441-93 | Honeywell Q3200U1004 | Robertshaw 41-409 |
| York / Coleman / Evcon (Norton 271N) | 025-32625-000 | White-Rodgers HotRod 21D64-2 | Robertshaw 41-408 |
Note for Lennox SureLight integrated modules: if your igniter is bundled into the ignition control board, you're replacing the whole module, none of these universals will fit.
Install reality, 30 minutes, 4 screws, one rule you can't break
- Cut power at the furnace disconnect AND turn off the gas valve. Both. Non-negotiable per NFPA 54.
- Pull the burner-compartment door.
- Locate the igniter, small ceramic element mounted next to the burners, usually 4-6 inches long.
- Unplug the connector (one molex or two spade lugs).
- Remove the mounting screw(s), usually 1-2 sheet-metal screws.
- Handle the new igniter by the ceramic base, NEVER the white/grey heating element. Skin oils interact with silicon nitride and silicon carbide at operating temperature and cause premature cracking. If you brush it, wipe with isopropyl alcohol.
- Mount, connect, restore gas, restore power, run a heat cycle.
- Confirm light-off within 17 seconds and steady flame.
FAQ
How long do furnace igniters last?
Carbide: 3-5 yrs. Silicon nitride: 7-15 yrs. Shorter if your unit short-cycles.
Silicon nitride vs carbide?
Nitride every time if you have the choice. Faster heat-up, lower amp draw, 2-3× lifespan, more crack-resistant.
How to test a furnace igniter with a multimeter?
Power off. Pull connector. Multimeter to ohms. Carbide: 40-90 Ω good. Nitride: 50-200 Ω good. OL or infinity = dead.
Can I install a universal igniter on any furnace?
Almost: Honeywell Glowfly, Robertshaw, Supco kits cover 100-300 cross-references. Exceptions: direct-spark systems and Lennox SureLight integrated modules.
Why does my new igniter keep failing?
Three causes: touched ceramic with bare fingers (skin oils crack at operating temp), dirty flame sensor (cycling igniter to death), or airflow problem causing limit-switch lockouts.
The bottom line
If your furnace is a 2010-or-newer Carrier-family unit, buy the OEM LH33ZS004, it's nitride, plug-in, no fitting drama. For everything else, buy the Honeywell Q3200U1004 "Glowfly", universal silicon nitride, six brackets, fits 110+ OEM cross-references, and you get 7-15 years instead of 3-5. The $25 premium over a carbide universal pays for itself the first time you don't have to do this job again. Cut power, cut gas, don't touch the ceramic. You've got this.
Affiliate disclosure: As an Amazon Associate, Building Talks earns from qualifying purchases. We may also earn a commission from other partners at no extra cost to you. Pricing subject to change.
Editorial standards: Cited authorities include NFPA 54 National Fuel Gas Code, Trane Commercial HVAC HSI specifications, Robertshaw silicon nitride/carbide spec sheets. Reviewed by Al, Building Doctor, IUOE Local 39 Stationary Engineer.