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 |
| Price | $45-$55 |
- Honeywell Q3200U1004 Glowfly on Amazon — $45-$55
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 |
| Price | $15-$25 |
- Robertshaw 41-409 on Amazon — $15-$25
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 — $35-$50
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 |
| Price | $18-$25 |
- Robertshaw 41-408 on Amazon — $18-$25
5. Best budget aftermarket — Supco SIG1100 Universal Kit
Supco built a parts business by being honest budget gear. 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 |
| Price | $20-$30 |
- Supco SIG1100 on Amazon — $20-$30
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: Building Talks may earn a small commission from qualifying purchases. 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.