Best Silicon Carbide Heater Igniters and Nitride Replacements

Overview: This guide compares five popular silicon carbide heater replacement igniters (silicon nitride hot rod style) for furnaces, boilers, and water heaters. The table below summarizes the selections and key specs to help you scan options quickly.

Product	Brand	Key Spec
H150 Universal Ignitors	YUXIVCNE	120V, 150W, 9–17 Ω
Universal Silicon Nitride Hot Rod Ignitor	AUGREX	120V ±0.5V, 150W, 1.97″ element
H150 Universal Furnace Igniter	Cenipar	120V, 150W, 1.95″ element
Universal Ignitor (120V)	Aupoko	Universal fit, large ignition area
MCAMPAS Universal Ignitor	MCAMPAS	120V, 1.97″ element, 9–17 Ω

H150 Universal Ignitors, 120V Silicon Nitride Hot Rod Ignitors

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This H150 unit Is Marketed As A Replacement For silicon carbide igniters in water heaters, boilers, and gas-fired forced-air furnaces. The product features a nitride heating element of about 1.97″ and a ceramic insulator body. Manufacturer notes solve common failure modes such as open continuity, abnormal resistance, non-glowing element, cracking, or moisture damage. The listed cold resistance range is consistent with typical replacements at 9–17 Ω, and the design emphasizes a larger ignition surface for reliable flame initiation. Cable and construction details reflect standard HVAC replacement specifications.

Universal Silicon Nitride Hot Rod Ignitor 120V 150W

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This AUGREX replacement specifies performance metrics such as a rated power of 150W, rated voltage 120V ±0.5V, and cold resistance around 9–17 Ω. The listing cites a high operating temperature (≥1180℃) at the stated test condition, a 1.97″ nitride element, and an unglazed 95% alumina ceramic insulator. Cable specification (20 AWG rated to 250°C) and splice/bracket mounting requirements are given, indicating attention to installation stability and heat-resistance in typical furnace applications.

H150 Universal Furnace Igniter, 120V Silicon Nitride Hot Rod Igniter

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The Cenipar-listed H150 model matches common replacement specs: 150W power rating, cold resistance of 9–17 Ω, and a nitride heating element roughly 1.95″ long. The description emphasizes problem solving for typical igniter failures and notes a non-glazed 95% alumina polished insulator finish. Cable length and temperature-rated wires are included for compatibility with standard furnace electrical connections.

Universal Ignitor, 120V Silicon Nitride Hot Rod Ignitor

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This Aupoko replacement describes a wide application fit for almost 90% of common furnaces, boilers, and water heaters that originally used silicon carbide igniters. The product highlights durable nitrided construction, a large ignition area, and two metal brackets to aid installation. The material listed is silicon nitride for improved thermal conductivity and high-temperature resistance, positioned as an upgrade over older silicon carbide elements.

MCAMPAS Universal Silicon Nitride Hot Rod Ignitor 120V

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MCAMPAS Provides A 120V nitride ignitor replacement with a 1.97″ heating element and typical cold resistance specifications of 9–17 Ω. The listing includes a brief test guide on using a multimeter to confirm continuity and notes the element and ceramic insulator materials. Cable and insulation ratings are consistent with industry norms for furnace igniters, and the product positions itself as a direct replacement for a wide range of silicon carbide ignitors.

Buying Guide: How To Choose A Silicon Carbide Heater Replacement Igniter

Choosing a replacement igniter for a silicon carbide heater or hot surface ignition system requires matching electrical, mechanical, and environmental specs. Below are the principal considerations and comparison perspectives to guide a selection.

Compatibility And Fit

• Model Match: Verify the OEM part number when possible. Many universal nitride ignitors aim to replace a broad range, but confirm physical dimensions and bracket placement.
• Element Length And Insulator Size: Compare the nitride element length (≈1.95–1.97″) and ceramic insulator dimensions to ensure proper mounting and clearance.
• Bracket And Mounting Type: Some replacements include metal brackets or require reusing the OEM bracket. Confirm how the igniter will be secured in your heater.

Electrical Specifications

• Rated Voltage: Most replacements are rated for 120V. Confirm the furnace control voltage matches the part specifications.
• Power Rating: Typical power is 150W for common hot surface igniters; ensure the control board and transformer provide appropriate power.
• Cold Resistance: A common diagnostic range is 9–17 ohms. Use a multimeter to compare the old igniter reading and the new part’s listed range.

Material And Durability

• Silicon Nitride Vs. Silicon Carbide: Many modern replacements use silicon nitride because of improved toughness and thermal shock resistance compared with older silicon carbide elements.
• Ceramic Insulator: Look for non-glazed 95% alumina or similar high-purity ceramic for consistent insulation and resistance to contamination.
• Cable And Wire Rating: High-temperature rated wires (e.g., 20 AWG rated to 250°C) and UL specification cables help ensure long-term stability.

Performance And Testing

• Operating Temperature: Product listings often provide a tested operating temperature (e.g., ≥1180℃ under specific conditions) — useful for heavy-duty applications.
• Continuity And Resistance Tests: Before installation, measure cold resistance. A zero or open reading indicates a failed element.
• Ignition Area And Glow Consistency: A larger ignition surface can improve initial flame rollout and reduce cycling stress on the control board.

Installation And Safety

• Proper Disconnect: Always disconnect power and follow appliance safety instructions before replacing an igniter.
• Handle With Care: Hot surface elements are brittle. Avoid touching the heating element with bare hands or applying lateral force.
• Compatibility With Control Systems: Ensure the control board supports the replacement igniter’s power draw and response characteristics.

Comparison Perspectives

• Cost-to-Longevity: Universal nitride replacements are generally positioned to offer longer life and better thermal shock resistance compared to some legacy silicon carbide parts.
• Universal Fit Vs. Exact OEM: Universal models provide broad compatibility and faster availability; OEM matches can minimize fitment concerns but may have limited supply.
• Material Trade-offs: Silicon nitride typically offers improved toughness; however, confirm the specific part’s design and testing claims for high-temperature stability.

When To Replace Vs. Repair

• Igniter Non-Glow: If a multimeter shows no continuity, replacement is required.
• Intermittent Failures: Cracks, moisture exposure, or erratic resistance readings suggest replacement rather than repair.
• Control Board Diagnostics: Confirm the ignition control sequence and verify that the board is sending voltage before changing the igniter to avoid misdiagnosing a control fault.

Installation Checklist

1. Turn off power and gas to the appliance.
2. Confirm replacement part dimensions and orientation.
3. Disconnect old igniter wiring and remove securing brackets carefully.
4. Install the new igniter without stressing the ceramic element; secure brackets as needed.
5. Reconnect wires, restore power, and run the appliance through a test ignition cycle.
6. If ignition fails, re-check wiring, control voltages, and continuity before assuming part fault.

By comparing electrical ratings, element dimensions, material properties, and installation requirements, you can select a replacement igniter that aligns with your heater’s design and longevity expectations. Always follow appliance manufacturer guidance and safety procedures when replacing hot surface igniters.