The best hot surface ignitor for a water heater is the exact replacement specified for the heater’s make and model. The Rheem AP14218B kit is the most complete option listed for buyers who need an ignitor, sensor, and gasket, while the Rheem SP14218A is a simpler Rheem/Ruud replacement part. The Etna and 007400F options are associated with pool-heater applications, so verify equipment type and part number before choosing them.
| Product | Best suited for | Key listed detail |
|---|---|---|
| Rheem AP14218B kit | Buyers needing several replacement components | Includes ignitor, sensor, and gasket |
| Rheem SP14218A | Rheem/Ruud replacement checks | 18-inch hot surface ignitor |
| DS014KX | Buyers matching the listed Rheem part number | Identified as DS014KX / AS39271 1099 |
| Etna EHTP7400R | Hi Delta or Delta Limited equipment checks | Replaces Ray 007400F |
| 007400F replacement ignitor | Specified pool-heater models | Listed as a 120V replacement |
Rheem AP14218B Ignitor Assembly Kit
Best for: Buyers whose water heater calls for the AP14218B and who want the included related components. The listing describes this as an upgraded OEM replacement and says the kit includes an ignitor, sensor, and new gasket.
This is the most comprehensive water-heater-focused choice in this list based on the stated contents. Having the sensor and gasket in the same kit may be useful when the repair instructions or existing condition call for replacing those pieces as well. Confirm the model and required part number against the heater’s documentation before ordering.
Limitation: The listed description does not identify every compatible heater model. Do not assume that a Rheem-branded heater automatically uses this assembly.
Rheem SP14218A 18-Inch Ignitor
Best for: Buyers checking a Rheem or Ruud appliance that specifies SP14218A. The product details identify it as an 18-inch hot surface ignition replacement part for Rheem/Ruud.
Choose this part when the appliance label, service documentation, or removed part confirms the SP14218A number. The stated length and manufacturer-family reference offer useful comparison points, but they are not enough on their own to establish compatibility. Match the complete part number rather than relying only on appearance.
Limitation: The listing describes an ignitor, not a kit with a sensor and gasket. If the repair calls for additional components, check whether they must be sourced separately.
DS014KX Rheem Water Heater Ignitor
Best for: Buyers whose parts information identifies DS014KX or the listed Rheem reference AS39271 1099. The product name specifically presents this as a water heater hot surface ignitor.
This is a focused replacement option when its identifying numbers match the part required by the appliance. Check the model plate and the old component’s markings before purchase. If the numbers differ, contact a qualified service professional or consult the manufacturer’s parts information rather than treating this as a universal Rheem ignitor.
Limitation: The supplied features do not give a compatibility list, dimensions, or included accessories. Those details need to be confirmed for the specific repair.
Etna EHTP7400R Hot Surface Ignitor
Best for: Buyers servicing equipment identified as Hi Delta or Delta Limited and whose parts reference calls for this ignitor. The listing says it replaces Ray 007400F and notes that it is factory test fired.
This product is included because it may match a specialized heater application, but the supplied details do not establish it as a general residential water-heater part. Verify the equipment category and replacement number carefully. A matching replacement reference is more useful than choosing solely because the component is called a hot surface ignitor.
Limitation: Its stated application is Hi Delta/Delta Limited equipment. Avoid selecting it for a standard water heater unless that appliance’s documentation specifically identifies it.
007400F 120V Pool-Heater Ignitor
Best for: Buyers replacing a 007400F ignitor on one of the pool-heater models named in the listing: 302B, 402B, 502B, 652B, 752B, or 902B. The supplied features specify a 120V replacement and advise checking the part model before installation.
This is a pool-heater-oriented choice, not a broad residential water-heater recommendation. Select it only when the equipment and part number match. Its listing says it is intended to address certain pool-heater operation problems, but symptoms alone do not confirm that an ignitor is the cause.
Limitation: The stated voltage and model range are specific. Do not use this listing as evidence of compatibility with an unrelated water heater.
Buying Guide: How To Choose A Water Heater Hot Surface Ignitor
How do you identify the correct replacement?
Start with the heater’s model and serial information, then consult the appliance’s parts documentation or a qualified technician. Compare the specified replacement number with the product listing. When removing an old part, its label or stamped number may help, but an old component can itself be incorrect or previously substituted. Match the appliance requirements rather than relying on a visual resemblance.
Part numbers are especially important in this group because the products have different stated applications. The AP14218B kit and SP14218A are Rheem-related listings; DS014KX is identified with Rheem references; the Etna EHTP7400R is listed for Hi Delta/Delta Limited equipment; and the 007400F replacement is described for named pool-heater models.
Does “hot surface ignitor” mean every part is interchangeable?
No. “Hot surface ignitor” describes a component type, not a universal fit. Ignitors can differ in their part numbers, physical configuration, electrical requirements, and associated assemblies. The provided information does not give complete specifications for every product. Confirm the exact replacement reference and any required electrical or physical details using the equipment documentation before buying.
Should you choose an ignitor alone or an assembly kit?
Choose a kit when the required repair calls for the additional parts it includes. The AP14218B listing says it contains an ignitor, sensor, and gasket. The SP14218A is described as an ignitor, while the supplied information for DS014KX does not state that extra pieces are included. Do not assume a kit is necessary—or that its parts are suitable—without checking the appliance’s repair requirements.
What should pool-heater buyers check?
Confirm that the appliance is a pool heater and that its model or replacement documentation matches the specific product. The 007400F listing names several pool-heater models and states 120V; the Etna product cites Hi Delta and Delta Limited. These application details make them poor default choices for a conventional domestic water heater. Similar wording in product names does not establish cross-compatibility.
When should you ask a professional for help?
Ask a qualified service professional if the part number is unclear, the equipment does not match a listing’s stated application, or the heater continues to malfunction after the correct repair. Fuel-burning appliances involve ignition and combustion systems. Follow the manufacturer’s service instructions, turn off power and fuel as directed, and do not bypass safety controls. Stop if you are uncertain about safe removal or installation.
Also avoid diagnosing an ignitor from a single symptom. A heating problem can have causes other than the ignitor, and the supplied product details do not provide diagnostic procedures. Use the heater’s troubleshooting information or arrange professional service when the cause is uncertain.
Frequently Asked Questions
What is a hot surface ignitor in a water heater?
It is an ignition component used in some gas appliances to help ignite the burner. The correct type and replacement number depend on the specific heater.
Which product in this list includes a sensor and gasket?
The Rheem AP14218B listing says its kit includes an ignitor, sensor, and new gasket.
Is the 007400F replacement a standard water heater part?
The supplied listing describes it as a 120V pool-heater ignitor for specified models. It should not be treated as a general water-heater replacement.
Can I choose an ignitor based only on its brand?
No. Verify the appliance model and exact required part number. Brand names alone do not confirm compatibility.
What if my old ignitor looks like one of these products?
Compare its part number and the heater’s parts documentation. Similar appearance is not enough to establish a correct or safe fit.