If you are searching for a tankless hot water coil, first identify whether your unit is gas or electric: gas models use an ignitor coil to spark the burner, while electric models use a heating element to heat water. The WISINY and Rheem ignitor coils are options for compatible gas heaters; the 55220 element is for listed electric models. A flushing kit is a maintenance accessory, not a replacement coil. Check your heater’s model and part number before choosing.
| Product | Best For | Part Type |
|---|---|---|
| WISINY RTG20235BC Ignitor Coil | Replacing a compatible gas-heater ignitor | Ignitor coil |
| WISINY Two-Pack RTG20235C | Buyers seeking two replacement ignitor coils | Ignitor coils |
| Rheem RTG20235BC Ignitor Coil | Those seeking the listed Rheem factory-authorized part | Ignitor coil |
| 55220 Heating Element Two-Pack | Owners of listed electric tankless models | Heating elements |
| Tankless Heater Flushing Kit | Routine tankless-heater maintenance | Cleaning kit |
WISINY RTG20235BC Ignitor Coil
This replacement ignitor coil is intended for certain gas tankless water heaters. The listing identifies part numbers RTG20235C and RTG20235BC, and names Rheem, Richmond, and Ruud tankless heater applications. It also describes the part as a PLM-112 replacement.
Best for: Owners of a compatible gas heater who have verified that the installed ignitor uses one of the listed part numbers. The product is selected because it directly addresses the ignition-coil search and the listing connects the part with a burner that will not light and error code 11.
The listing describes a durable construction intended for repeated use. However, it does not establish compatibility with every Rheem, Richmond, or Ruud model. Match the heater’s model and original part number before ordering. An ignition fault can have causes other than a failed coil, so this part alone may not resolve every error code or no-ignition problem.
WISINY Two-Pack RTG20235C Ignitor Coils
This listing is for a two-piece set of gas tankless water heater ignitor coils. It identifies RTG20235C and PLM-112 as replacement part numbers and states that the part is designed for Rheem tankless water heater applications. The product description also associates the ignitor with a burner that will not light and error code 11.
Best for: Buyers who have confirmed the required part number and want two coils rather than one. It is a useful comparison with the single-coil WISINY option because the listed package quantity differs. Choose this if having a spare is useful; do not assume that both pieces are needed for one repair.
The listing says installation is easy and describes the construction as suited to high heat and frequent use. Those claims do not replace model-specific fit checks or safe installation procedures. The stated compatibility focuses on Rheem, so buyers with another brand should verify fit rather than relying on a general similarity in appearance. The supplied information does not confirm universal compatibility.
Rheem RTG20235BC Ignitor Coil
This RTG20235BC part is described as an OEM genuine factory-authorized part. Its stated function is to produce a high-voltage spark that ignites a gas burner, allowing the heater to start without a standing pilot. The listing also notes that the coil is accessible for maintenance.
Best for: Buyers seeking the specifically listed Rheem factory-authorized part for a compatible heater. It is selected as a direct comparison against third-party replacement coils, particularly for shoppers who prioritize the product’s stated OEM status and exact RTG20235BC part number.
Before purchasing, confirm that RTG20235BC is the correct part for the heater’s model and existing assembly. The product information does not provide a complete model-compatibility list, so the part number alone may not answer every fit question. This is an ignition component for gas units, not an electric heating element. It will not address a problem caused by water flow, gas supply, or another heater component.
55220 Electric Tankless Heating Element Two-Pack
This is a two-pack of screw-in electric water heater elements, not a gas ignitor coil. The listed part number is 55220, and the product description identifies a 5,500-watt element and a new O-ring and screw. Listed applications include EcoSmart ECO POU 6, ECO 8, ECO 11, several Eemax models, Rheem RTEX-13, RTEX-11, RTEX-06, and Richmond RMTEX-06.
Best for: Owners of a listed electric tankless model who have confirmed that the heater needs a 55220 heating element. It is included because people searching for a “hot water coil” may mean the electric component that heats water, rather than a gas ignitor.
The listing says the element may address failure to heat, slow heating, or low water temperature when the element is the cause. Those symptoms can have other causes, so diagnosis matters. Compatibility is limited to the listed models and should be checked against the heater’s exact model and required voltage and element specification. This part is not suitable as a substitute for a gas heater’s ignitor coil.
Tankless Water Heater Flushing Kit
This kit is for cleaning and maintaining a tankless water heater, not for replacing an ignition coil or heating element. It includes a 1/6-horsepower submersible pump, two six-foot PVC hoses, adapters, washers, a three-gallon bucket, and a bucket lid opener. The listing describes connecting the hoses to tankless isolation valves and circulating a cleaning solution.
Best for: Owners who already have the appropriate isolation valves and want the listed pump-and-hose components for flushing their heater. It is included as a related maintenance product for buyers troubleshooting or caring for a tankless system, rather than as a repair part.
The described flushing mixture uses vinegar or a biodegradable cleaner with water, but neither cleaning agent is included. The listing gives a pump flow rate of 1,100 gallons per hour and a maximum delivery height of 16.5 feet. Use the heater manufacturer’s maintenance instructions to determine whether flushing is appropriate and how to perform it. This kit will not fix a failed ignitor or heating element.
Buying Guide: How To Choose A Tankless Heater Coil
Does “coil” mean an ignitor or a heating element?
Start by identifying the heater’s fuel type. A gas tankless heater uses an ignition system to light its burner. The ignitor coil’s role is to create the spark; it does not directly heat the water. An electric tankless heater uses heating elements to warm water as it passes through the unit. These parts are not interchangeable.
If the heater is gas-fired and the burner does not light, an ignitor coil may be relevant, but the symptom alone does not prove that the coil has failed. If the heater is electric and produces insufficient hot water, a listed heating element may be relevant only after confirming the model and diagnosing the problem.
How do I confirm the right part number?
Read the heater’s model and serial information from its label and compare it with the part number on the existing component, if accessible. The product listings identify RTG20235C, RTG20235BC, and PLM-112 for particular ignitor-coil replacements, while the electric element listing identifies part number 55220. Do not choose a part based only on a broad brand name or a similar-looking image.
- Match the replacement part number to the heater documentation or the removed part.
- Check the exact heater model against the seller’s stated compatibility.
- For electric elements, verify the model, voltage, and element specification.
- Ask the manufacturer or a qualified technician when the part number or cause is uncertain.
Should I choose a single ignitor coil or a two-pack?
Choose a single coil if you need one verified replacement and do not want an extra part. A two-pack may suit buyers who want a spare, but the package quantity does not establish that two coils are required for a repair. Compare the listed part numbers and compatibility before comparing package contents.
The WISINY listings describe replacement options for specified part numbers, while the Rheem listing identifies its component as an OEM genuine factory-authorized part. These descriptions provide different selection details; buyers should still confirm model fit and the actual cause of the heater problem.
When is a flushing kit the right purchase?
A flushing kit is a maintenance tool, not a coil replacement. The listed kit provides a pump, hoses, and a bucket for circulating a cleaning solution through a tankless heater. It may be appropriate when routine cleaning is due under the manufacturer’s maintenance instructions and the unit has the necessary connections.
Check whether the cleaning solution is included; this kit’s listing says vinegar or biodegradable cleaner is not included. Follow the heater manufacturer’s instructions for flushing and isolation-valve use. If you are unsure how to service the unit, consult a qualified professional.
What symptoms should I investigate before ordering?
A gas burner that does not light can have more than one cause. An error code mentioned in a product listing may point toward an ignition issue, but it is not proof that a particular part has failed. Likewise, low or absent hot water from an electric unit does not automatically mean its heating element needs replacement.
Check the heater’s own diagnostic information and service documentation. Consider whether the issue could involve another system component or a condition outside the heater. Replacing a part without confirming compatibility and diagnosis can leave the original problem unresolved.
Frequently Asked Questions
Is a tankless hot water ignitor coil the same as a heating element?
No. A gas heater’s ignitor coil creates a spark to light the burner. An electric heater’s heating element transfers heat to the water. The parts serve different heater types and cannot substitute for one another.
Will an RTG20235BC coil fit every Rheem tankless heater?
No universal fit is established by the supplied product information. Confirm the exact heater model and required part number before ordering.
Can an ignitor coil fix error code 11?
The WISINY listing associates its replacement coil with error code 11 and ignition failure. The code alone does not confirm that the coil is the cause, so consult the heater’s diagnostic guidance before replacing a part.
Does the 55220 element work in a gas tankless heater?
No. The 55220 listing describes an electric heating element for specified electric tankless models. It is not a gas-heater ignitor coil.
Does the flushing kit include vinegar or cleaner?
No. The listing says the cleaning agent is not included. It describes using vinegar or a biodegradable cleaner mixed with water, subject to the heater manufacturer’s instructions.
Can I install these parts without professional help?
The WISINY two-pack listing describes installation as easy, but installation requirements depend on the heater and the repair. Follow the manufacturer’s service instructions and seek qualified help if you cannot safely identify or replace the component.