Diesel Heater Glow Plug 12V/24V — Genuine Kyocera Silicon Nitride, Fits Webasto, Espar & Chinese Heaters
Only 16 in stock
Your diesel heater won't light on a cold morning? Nine times out of ten, the glow plug is the part that quit. The cheap no-name plugs bundled with budget heaters crack from thermal cycling and burn out in a single season.
This is the real thing — a genuine Kyocera silicon nitride glow plug from Japan, the exact glow-pin brand Webasto and Espar build into their own heaters. It's rated to 1400°C (2552°F) with a very low thermal expansion rate, so it heats fast, ignites reliably down to freezing, and survives thousands of cold starts.
That's why it costs more than the $15 kits — those use no-name ceramic pins that look identical and fail early. You're paying for the one part of your heater you never want to gamble on.
| Spec | Detail |
|---|---|
| Material | Silicon nitride (Si₃N₄) glow pin — Kyocera, Japan |
| Voltage | 12V or 24V |
| Max operating temp | 1400°C (2552°F) |
| Thermal expansion | 7×10⁻⁶/°C — very low |
| Vickers hardness | 17.1 GPa |
| Wire sheath | Teflon — heat-resistant, won't melt |
| Fits | Webasto, Espar / Eberspächer & most Chinese diesel heaters |
Why a Genuine Kyocera Plug Outlasts Cheap Ceramic
A Kyocera silicon nitride pin lasts because it barely expands when it heats. Its thermal expansion rate is just 7×10⁻⁶/°C — so it doesn't micro-crack through the thousands of heat-and-cool cycles that split cheap ceramic pins. That one number is the difference between a plug that runs for years and one you replace every winter.
You also get a Vickers hardness of 17.1 GPa, so the tip resists erosion from the fuel spray and the constant ignition arc. Harder material means the glow surface stays intact instead of pitting and losing output.
Rated to 1400°C (2552°F), the pin reaches ignition temperature fast and holds it. Your heater lights on the first try in freezing weather, instead of cranking through failed start cycles that drain your battery and flood the burner.
The Teflon wire sheath handles the heat without melting or going brittle, so the connection stays solid where cheap plugs fail at the wire first. It's the same silicon nitride pin Webasto and Espar trust — you're just buying it as a replacement part instead of a whole new heater.
What It Fits — Webasto, Espar & Chinese Diesel Heaters
This glow plug is a direct, universal fit for Chinese 2KW, 5KW and 8KW diesel heaters and for Espar / Eberspächer units — same pin, drops straight in. For Webasto, hold it next to your old pin first; the shape makes it easy to see whether it's the match your heater takes.
If your heater lights with a silicon nitride glow pin — not an open flame or an old-style metal coil — this is the part it's built to take. One plug covers the vast majority of air parking heaters on the road and water today. It ships pre-wired with a rubber seal and connector, so most replacements are plug-and-play. If your heater uses a different connector, just splice the two leads onto your existing wires.
12V or 24V — How to Choose the Right One
Match the glow plug to your heater's voltage, not your battery bank. Pick 12V for most vans, RVs, campers, cars and boats; pick 24V for trucks, buses, heavy equipment and larger marine setups.
The pin is voltage-specific for a reason. Put a 12V plug on a 24V system and it burns out in minutes; put a 24V plug on 12V and it never gets hot enough to light your fuel.
Not sure which you have? Check the label on your heater, the original plug, or your heater's manual — the voltage is printed on all three. When in doubt, match the number stamped on the plug you're pulling out.
How to Tell Your Glow Plug Has Failed
A failing glow plug shows one clear sign: your heater pumps fuel and runs the fan, but never lights. You'll hear the pump ticking and smell raw diesel, then the unit throws an ignition error and shuts down.
Watch for these symptoms:
- Repeated failed start cycles, then a lockout or error code
- White smoke and an unburnt-fuel smell at the exhaust
- Hard starting that takes several tries in the cold
- Lights fine when warm, but not on freezing mornings
Two quick checks confirm it. Pull the plug and look at the tip — a cracked, blistered or heavily sooted surface is finished. Then test resistance with a multimeter; an open reading with no continuity means the element has burned through and the plug is dead.
Replace it before the failed cycles drain your battery or flood the burner with unburnt fuel. A fresh Kyocera pin brings most heaters back to a clean first-cycle start.
Frequently Asked Questions
How long does a diesel heater glow plug last?
There's no fixed interval — a glow plug is a wear part you replace when it fails. Cheap no-name pins often quit within one or two cold seasons. A genuine Kyocera silicon nitride pin holds up for years of regular cold-weather starts, because it resists the thermal shock that cracks lesser plugs.
Why does this cost more than the $15 glow plug kits?
You're paying for a genuine Kyocera silicon nitride pin — the same glow-pin brand Webasto and Espar build into their heaters. The $15 kits use no-name copies that look identical but lose output and crack early. Over the life of your heater, one Kyocera pin outlasts a stack of cheap ones.
Do I need a special tool to replace the glow plug?
No special tool — a standard socket or spanner removes and refits it, and we sell the plug on its own. Never use pliers or over-tighten it; the silicon nitride tip can crack under too much force. Snug it firmly by hand, no more.
Will it fit my Webasto or Espar heater?
It's a direct fit for Espar / Eberspächer and virtually all Chinese 2KW–8KW heaters. For Webasto, hold it next to your old pin first — the shape and thread make the match easy to see. Always match the voltage, 12V or 24V, to your heater.
Is silicon nitride the same as a ceramic glow plug?
Silicon nitride is a ceramic — the best kind for this job. The real difference isn't ceramic versus silicon nitride; it's a genuine Kyocera silicon nitride pin versus a cheap resistance-wire or low-grade copy. Kyocera's grade resists oxidation and thermal shock, which is why it lasts.
Does it come with a seal, or do I reuse my old one?
Every plug ships with the correct Kyocera-matched rubber seal, so you don't reuse the old one or hunt for a washer. That seal keeps combustion gases where they belong once the plug is snug. Fit it dry, don't over-tighten — the seal does the work, not brute force.
Buy It With Confidence
Every plug is backed by our quality guarantee — if it arrives defective or fails from a manufacturing fault, we replace it, no hassle. You're buying direct from Vvkb, a diesel heater manufacturer since 1996, not a random reseller flipping no-name stock.
Skip the gamble on a no-name pin. Get the genuine Kyocera silicon nitride glow plug your heater was built to start with — in 12V or 24V, with the seal and connector ready to install.
