Pool Heater Parts

(362 products)

Discover premium pool heater parts and ensure your swimming environment remains warm and inviting year-round. Our collection features components compatible with popular models like Raypak, Hayward, and Pentair. From thermostats to control panels, find everything you need to replace and maintain your gas, electric, or solar heaters. Regular updates and replacements enhance performance and energy efficiency. Browse our selection of pool heater parts, including Raypak and Hayward, to enjoy a hassle-free heating experience.

Quick Links
Pool Heaters Pool Heaters
Sta-Rite Max-E-Therm Electrical System Parts
Sta-Rite Sta-Rite
Sta-Rite Max-E-Therm Electrical System Parts
Sta-Rite Max-E-Therm Water System Parts
Sta-Rite Sta-Rite
Sta-Rite Max-E-Therm Water System Parts
Sta-Rite Max-E-Therm Burner System Parts
Sta-Rite Sta-Rite
Sta-Rite Max-E-Therm Burner System Parts
Raypak 106/156a Heater Parts Diagram
Raypak Raypak
Raypak 106/156a Heater Parts Diagram
View as
Raypak 014875F Model 156A Copper Tube Bundle

Pool Heater Components and What They Do

Pool heaters are more complex than most other pool equipment because they combine water-side plumbing components with combustion or electrical systems. When a heater fails, diagnosing which component is responsible is the first step before ordering any parts. The most common failure points fall into a few distinct categories: heat exchangers, ignition components, sensors and switches, and control boards.

The heat exchanger is the core of a gas pool heater. It is a copper or cupronickel tube bundle that transfers heat from the combustion chamber to the pool water flowing through it. Heat exchangers fail primarily from corrosion, chemical imbalance in the pool water, or low flow conditions that cause overheating. A failed heat exchanger typically shows up as a water leak inside the heater cabinet or a drop in heating efficiency. Replacement heat exchangers are model-specific and are one of the more significant heater repairs in terms of cost, but still far less than a full heater replacement.

Ignition components including igniters, flame sensors, and ignition control modules are another common failure category, especially on older heaters. A heater that fires briefly and then shuts down, or that fails to ignite at all, is often pointing to one of these components. Pressure switches and high limit switches are the safety devices that cut power to the heater when flow drops too low or temperature exceeds safe operating limits. These wear out over time and are a frequent cause of heaters that will not stay running even when everything else appears normal.

Finding the Right Pool Heater Parts

Heater parts are highly model-specific. A heat exchanger, control board, or gas valve for a Raypak 406A will not fit a Raypak 266A, and parts from one brand will not cross over to another. Before ordering any heater part, locate your heater's model number on the rating plate, which is typically on the inside of the front door panel or on the rear cabinet. That model number is the most reliable way to confirm you are ordering the correct replacement.

For electrical components like control boards, thermistors, and transformers, matching the exact part number is critical. These components are not interchangeable even between models that appear similar. Many heater manufacturers use the same part number across a range of models, but some do not, so confirming compatibility before ordering saves time and return shipping. If you have the old part in hand, the part number is usually printed on a label on the component itself.

For mechanical components like pressure switches and high limit switches, the part number on the component is again your most reliable reference. These are safety-critical parts and installing the wrong specification switch can cause the heater to either shut down prematurely or fail to protect against an actual fault condition. EZ Pools carries heater parts for Raypak, Hayward, Pentair, Jandy, and Zodiac covering the most common residential and light commercial pool heater models. If you are unsure which part you need, our team can help you confirm compatibility before you order.

Pentair MasterTemp and Max-E-Therm High Limit Switch - Side

Frequently Asked Questions

How do I find the right parts for my pool heater?
Locate your heater's model number on the rating plate, which is usually found on the inside of the front door panel or on the rear cabinet. Use that model number to identify compatible replacement parts. For electrical components, the part number printed on the component itself is the most reliable reference. Heater parts are model-specific and are not interchangeable between brands or between models within the same brand.
Why is my pool heater not igniting?
A heater that fails to ignite or fires briefly and then shuts off is usually pointing to an igniter, flame sensor, ignition control module, or pressure switch. A pressure switch that has failed or is reading low flow will prevent the heater from firing as a safety measure even if water flow is actually adequate. Diagnosing which component is at fault typically requires checking error codes on the heater display if available, or testing each component individually.
What causes a pool heater heat exchanger to fail?
Heat exchanger failures are most commonly caused by corrosive pool water chemistry, particularly low pH or high sanitizer levels over an extended period. Low water flow through the heater can also cause localized overheating that degrades the heat exchanger over time. A leaking heat exchanger typically presents as water dripping inside the heater cabinet or visible corrosion on the tube bundle.
What does a pool heater pressure switch do?
A pressure switch monitors water flow through the heater and prevents it from firing when flow drops below a safe threshold. This protects the heat exchanger from overheating in a low or no-flow condition. A failed pressure switch is a common cause of a heater that will not stay running even when water flow appears normal. Pressure switches are safety-critical components and should be replaced with the correct specification part for your heater model.
When should I replace my pool heater instead of repairing it?
Repairing is usually the better choice when the heater cabinet and burner assembly are in good condition and the failure is isolated to a single component like a pressure switch, igniter, or thermistor. If the heat exchanger has failed due to corrosion on an older heater, or if multiple major components need replacement at the same time, the cost of repairs may approach the cost of a new unit. Browse our pool heaters collection if a full replacement makes more sense for your situation.

Related Articles

View all
  • Choosing the Right Pool Heater: A BTU Sizing Guide
    Choosing the Right Pool Heater: A BTU Sizing Guide

    Choosing the right pool heater isn't as simple as picking the biggest one you can afford. Get undersized and your heater runs constantly, struggles to hold temperature, and burns through...

    EZ Pools |

  • pool clarifiers vs pool flocculants
    Pool Flocculant vs. Pool Clarifier

    In maintaining a sparkling clear swimming pool, understanding the differences between flocculants and clarifiers is crucial. Many pool owners often grapple with choosing the right chemical to tackle murky water,...

    EZ Pools |

Shop Pool Heater Parts

Shop our selection of pool heater parts and find the heat exchangers, control boards, igniters, pressure switches, and sensors you need to get your heater running again. EZ Pools carries parts for Raypak, Hayward, Pentair, Jandy, and Zodiac with free shipping on qualifying orders.

Shop Now
Back to top