Facing a burner that won’t light or an error code 11? This guide highlights top tankless water heater igniter coils and ignition transformers that restore quick ignition for Rheem, Richmond, Ruud, and similar models. The best picks are suited for residential setups needing fast ignition, durable construction, and straightforward installation. Whether you want a single replacement or a 2-pack, these options focus on compatibility and reliability to minimize downtime.
Summary of selected products:
| Product | Best For | Why It’s Recommended |
|---|---|---|
| WISINY RTG20235C RTG20235BC | Customers with error code 11 | Direct fit for Rheem/Ruud/Richmond and durable build |
| PWBBDSC RTG20235C RTG20235BC | 2-pack reliability | Direct compatibility and steady supply for multiple units |
| Rheem RTG20235BC | OEM-grade replacement | High voltage spark ignition and easy maintenance |
| YRDNHJ RTG20235C RTG20235BC | Wider compatibility | Exact replacement with broad brand support |
| WISINY RTG20235BC | Rheem-specific repairs | Fixed error code 11, durable and easy to install |
WISINY RTG20235C RTG20235BC Ignitor Coil (1) Replacement
- Best for: Rheem/Ruud/Richmond tankless heaters experiencing ignition failure or Error Code 11.
- Why selected: Directly marketed as an ignitor coil replacement for RTG20235C/RTG20235BC and PLM-112, with durable construction to extend lifespan.
- Limitations: May require basic mechanical skill for wiring and mounting; verify 120V supply and model compatibility before purchase.
PWBBDSC RTG20235C Ignitor Coil (2-Pack)
- Best for: Homes needing back-up ignition coils or multiple units in one building.
- Why selected: Emphasizes exact replacement for RTG20235C/RTG20235BC/PLM-112 with a focus on consistent ignition performance and efficiency.
- Limitations: Availability is tied to a two-pack; check if you only need a single coil.
Rheem RTG20235BC Ignitor Coil – OEM Replacement
- Best for: Users preferring OEM-grade parts for reliability and ease of maintenance.
- Why selected: OEM replacement with high voltage spark ignition, designed for easy maintenance of tankless units.
- Limitations: Availability and exact fit should be confirmed for non-Rheem models.
YRDNHJ RTG20235C RTG20235BC Ignitor Coil (2-Pack)
- Best for: Budget-conscious buyers needing a replacement coil on multiple units.
- Why selected: Directly claims compatibility with RTG20235C/RTG20235BC and PLM-112, with a 120V operation profile.
- Limitations: Ensure correct unit model and brand fit to avoid compatibility gaps.
WISINY RTG20235BC Ignitor Coil – 2-Pack
- Best for: Rheem-specific ignition coil replacements with stable ignition.
- Why selected: Explicitly positions as a fix for Error Code 11; includes a 2-pack option for ongoing maintenance.
- Limitations: Confirm proper wiring connections and model alignment before installation.
RTG20235C Ignitor Coil Replacement – RMSPO
- Best for: Broad compatibility across 120V Rheem, Ruud, and Richmond models.
- Why selected: Emphasizes direct replacement for RTG20235C with a focus on restoring ignition and hot water on demand.
- Limitations: Check the model specifics to avoid mismatch with less common variants.
Buying Guide
Which igniter type fits your tankless heater?
Ignition coils (ignitors) and ignition transformers are common replacement parts. Confirm the exact part number (RTG20235C, RTG20235BC, or PLM-112) on your unit before buying. OEM parts can offer a straightforward fit, while aftermarket parts may provide cost savings with reliable performance.
Do you have a 120V system?
Most listed parts operate at 120V. Verify your heater’s electrical specifications to ensure compatibility and avoid ignition failures or electrical issues during installation.
How many replacements do you need?
Consider whether you need a single replacement or a 2-pack. A 2-pack can reduce downtime for multi-unit homes or commercial setups, but if you only have one unit, a single coil might be more cost-efficient.
What brands and models are supported?
Rheem, Ruud, and Richmond are the most commonly supported brands in these options. Check your unit’s model number and ensure the replacement part matches RTG20235C, RTG20235BC, or PLM-112 compatibility for a reliable fit.
Installation and maintenance considerations
Replacement typically involves switching off gas supply and power, disconnecting wiring, and mounting the coil in the correct orientation. Seek professional help if you are unsure about electrical connections or gas line safety. Regular inspection of ignition components can prevent recurring ignition failure.
FAQ
- What causes Error Code 11 on a tankless water heater? A failing ignitor coil or ignition transformer is a common cause, preventing the burner from lighting.
- Are these parts compatible with all Rheem tankless models? Compatibility varies by model. Look for part numbers RTG20235C, RTG20235BC, or PLM-112 to confirm.
- Is an OEM part always necessary? OEM parts offer a guaranteed fit but aftermarket options can provide good reliability at a lower cost; verify compatibility.
- Do I need professional help to install an ignitor coil? If you are comfortable with basic electrical and gas-safety steps, you may install it yourself; otherwise, hire a licensed technician.
- Can I replace just one component or should I replace the entire ignition assembly? Replacing the ignitor coil is often sufficient for ignition issues, but if symptoms persist, inspecting related components (thermocouples, transformers) is advisable.
- How can I prevent future ignition problems? Regular inspection of ignition components, keeping the area clean from dust, and ensuring proper gas pressure can help maintain reliable ignition.