Raypak 266 Pool Heat Exchanger Review: Reaches a Maximum Temperature of 104 Degrees Fahrenheit

The Raypak 266 in Short

Raypak 266 Pool Heater heats water with a 266000 British Thermal Units capacity for owners of swimming pools and spas.

Maintaining a swimming pool at a steady temperature requires a system capable of moving 266000 British Thermal Units of heat energy into the water. This level of output ensures that even during cooler periods, the water remains at a usable temperature for swimmers.

The Raypak 266 reaches this output level and is designed for outdoor installation. It uses a natural gas fuel source and includes a floor mount design, making it a stable choice for permanent patio or pool-side setups.

Our comparison involved 51 pool heat exchangers, from which we selected 15 for full review based on being the most-rated products that pass screening, with a limit of 2 per brand. The Raypak 266 was chosen because it has 221 buyer ratings, the 12th most of the 51 screened. This review is for buyers who prioritize high-volume heating and a programmable thermostat.

The Short Answer on the Raypak 266

Best for: you need to heat a large swimming pool using a natural gas connection and require a high-capacity output for consistent temperatures.

The Raypak 266 is a reliable choice for these requirements at the $2799 price point.

• Pro: The 266,000 British Thermal Units of heat output provides the high capacity needed for large water volumes.
• Pro: It includes a programmable thermostat to automate temperature maintenance.
• Pro: The intermittent spark ignition pilot safety controls provide a specific safety standard for gas operation.
• Con: The 210-pound weight requires a floor mount and may complicate placement in tight spaces.
• Con: It is rated for outdoor use only, which restricts installation options to exterior locations.

Don’t buy this if: your fuel infrastructure is set up for propane or electricity rather than natural gas.

Price assessment: The $2799 price is a fair market position for a high-output natural gas pool heat exchanger with these specific capacity ratings.

Key Specifications

Heating Capacity measures the 266000 British Thermal Units of total heat energy transferred to the water per unit of time.

If you need more power, explore our full review of the Raypak 336.

Before You Buy: Pool Thermal Exchanger Checklist

The first thing to check is the heating capacity to ensure it matches your pool’s volume, as a mismatch leads to a pool that takes too long to warm or a system that cannot keep up with the ambient temperature.

• ☐ Confirm the heating capacity is 266,000 British Thermal Units — if the capacity is too low for your pool size, you will struggle to reach your desired temperature during colder months.
• ☐ Verify the fuel type is Natural Gas — selecting a gas model without the proper infrastructure requires a costly and complex conversion to propane or electric.
• ☐ Check the maximum temperature setting of 104 Degrees Fahrenheit — if this is lower than your required peak temperature, the system will not reach your desired heat level.
• ☐ Confirm the unit is for outdoor use — purchasing an indoor-only model for a patio will lead to immediate weather damage and a required return.
• ☐ Budget for a floor mount installation — a floor mount requires specific surface preparation, and failing to plan for this can result in an unstable or unlevel unit.
• ☐ Ensure your plumbing supports an adequate flow rate — an improper flow rate leads to localized overheating and potential melting of plastic solar collectors or components.

You should not buy the Raypak 266 if your pool requires a heating capacity higher than 266,000 British Thermal Units or if you do not have a Natural Gas connection available at the installation site.

What the Numbers Mean in Use

How radiant burner heat output maintains consistent water temperature

You can rely on this output to keep large bodies of water heated consistently during active use.

Raypak 266 utilizes a radiant burner, which is a heating method that emits infrared radiation to warm the surrounding area. Because the material does not retain residual heat after it is turned off, the unit stops heating immediately when the power is cut. This allows for precise temperature control without the risk of the system continuing to heat the water after you have reached your desired setting.

How the programmable thermostat maintains a 104 Degree Fahrenheit pool temperature

You can set the Raypak 266 to a maximum temperature of 104 Degrees Fahrenheit using the programmable thermostat. This allows you to establish a specific target temperature that the system will maintain automatically throughout the day. The thermostat provides a consistent environment for your pool without requiring you to manually adjust the heat cycles.

The Raypak 266 includes intermittent spark ignition pilot safety controls, which ensure the pilot only comes on when there is a call for heat. This safety feature limits the time the pilot is active, reducing unnecessary fuel consumption. Because the unit is designed for outdoor use on a floor mount, these controls provide a specific safety layer for a permanent patio installation.

How the Raypak 266 Compares to Alternatives

The Raypak 266 provides a heating capacity of 266,000 British Thermal Units, which is the highest output among the similar pool heat exchangers we evaluated.

• The Raypak 266 costs $2,799, which is the same price as the Hayward W3H150FDP, Raypak PR156AENC, Raypak Digital Electronic Ignition, Raypak Propane Gas Pool Heater, and Hayward W3H135FDN.
• The Raypak 266 offers a 266,000 BTU capacity, while the Hayward W3H150FDP provides 150,000 BTU.
• The Raypak 266 features a radiant burner, while the Hayward W3H135FDN uses a Cupro nickel heat exchanger.

If you require a system designed specifically for propane fuel, the Raypak Propane Gas Pool Heater is the alternative to select over the Raypak 266.

Consider a DIY option by reading our breakdown of the Papa Bear Solar Heater.

For mobile setups, find the best solar pool heater panels with roof rack for your vehicle.

Getting the Raypak 266 Working, and What to Check After

Setting Up Your This Pool Heat Exchanger

To get your pool thermal exchanger running, you must first have a functional natural gas supply line connected to your outdoor area.

1. Unpack the Raypak 266 and place it on a level surface for floor mounting.
2. Connect the unit to your pool plumbing lines using a PVC bonding coupler.
3. Attach a pressure gauge to the line to monitor system pressure and prevent leaks.
4. Install a circulation pump to move water through the heating system for consistent temperature.
5. Set the programmable thermostat to your desired temperature, up to the 104 Degrees Fahrenheit maximum.

Warranty and Support: What to Check

Warranty coverage and support terms differ depending on your specific seller and country.

• Confirm the 266000 British Thermal Units heating capacity matches your pool‘s volume requirements to ensure the unit doesn’t overheat.
• Verify the radiant burner’s pilot safety controls are functioning to ensure the heat only activates when called for.
• Check that the multi-colored exterior shows no damage from shipping, as the 210-pound weight makes it difficult to move once installed.

Test the unit for 30 minutes on the day it arrives to confirm the heat output meets your expectations before the return window closes.

What Buyers Still Want to Know About This Pool Thermal Exchanger

Is the Raypak 266 pilot light safe to leave on?

Yes, the Raypak 266 includes intermittent spark ignition pilot safety controls, which means the pilot only activates when there is a call for heat. This design reduces the risk of a constant open flame and ensures the unit only operates when you need to heat your pool.

What is the heating capacity of the Raypak 266?

The Raypak 266 provides 266,000 British Thermal Units of heat output. This capacity determines the total amount of thermal energy the unit transfers to the water per unit of time to maintain your desired temperature.

Does the Raypak 266 use natural gas?

Yes, the Raypak 266 is designed for use with natural gas fuel. You will need to ensure your property has the necessary gas infrastructure to support a pool thermal exchanger of this type.

What is the maximum temperature setting for this unit?

The Raypak 266 reaches a max temperature setting of 104 Degrees Fahrenheit. This limit defines the peak temperature the system can maintain for your swimming pool or spa.

How much does the Raypak 266 weigh?

The Raypak 266 weighs 210 pounds. Since this is a floor mount unit, you should confirm your installation site can support this weight before the delivery arrives.

What is the buyer rating for the Raypak 266?

The Raypak 266 has a 3.9 rating from 221 buyer ratings. This score provides a signal from a large sample of owners regarding their experience with the unit.

Is the Raypak 266 Right for You?

Who the Raypak 266 suits and the jobs it is the wrong choice for, listed below with the reason for each.

Where to Buy This Pool Heat Exchanger

The Raypak 266 sat at $2799 in the listing data from November 2026; the price you see at checkout can differ.

Pool heat exchangers are sold by the retailers below – we do not track which of them has the Raypak 266 in stock, so check availability and the current price with the retailer before making a trip.

• PoolSupply.com (online only) — specialist retailer with a deep inventory of heating systems
• Wayfair (online only) — variety of residential pool heating products for home use
• Build.com (online only) — trade-oriented selection of professional pool heating equipment
• Amazon (online only) — wide selection of residential solar and electric pool heating brands
• Home Depot (online and physical stores) — large inventory of pool accessories and in-store pickup options
• Lowe’s (online and physical stores) — broad range of pool equipment and local store availability

Final Verdict on the Raypak 266

If you need to maintain a consistent temperature in a large swimming pool, the Raypak 266 provides a heating capacity of 266,000 British Thermal Units. This output measures the total amount of heat energy transferred to the water per unit of time, which is the primary metric for determining if a pool heat exchanger can keep up with environmental heat loss.

The Raypak 266 uses natural gas to reach a maximum temperature setting of 104 degrees Fahrenheit. Because it utilizes a radiant burner type, it provides consistent heat transfer for pool and spa applications. The unit weighs 210 pounds and is designed for floor mounting in outdoor patio environments.

You should choose the Raypak 266 if you require a high-capacity natural gas heating solution for a standard-sized pool. This model is available for around $2,799.

The 266,000 British Thermal Units of heat output provides the necessary scale for large-volume water heating. The 3.9 rating from 221 buyers serves as a secondary signal of the product’s performance in the field.

Skip it if: you require an electric heating system or need a unit with a higher maximum temperature setting than 104 degrees Fahrenheit.