Raypak 336 Pool Heat Exchanger Review: Releases Heat Only When a Call for Heat Occurs

Raypak 336 Overview

Raypak 336 heats pool water with a 336,000 BTU capacity, providing sufficient thermal output for those needing to maintain a usable temperature in a 20,000-gallon pool.

Heating a 3,000-gallon pool quickly requires a dedicated heat source capable of moving 30,000 to 50,000 BTU of energy in a short window. With a 336,000 BTU capacity, this unit provides the necessary thermal energy to reach target temperatures rapidly.

The Raypak 336 provides this rapid heating capability through a natural gas configuration. Its design includes space-age material that does not retain residual heat after being turned off, allowing for more precise temperature management.

We evaluated 51 pool heat exchangers and selected 15 for full review based on the highest buyer ratings that pass screening. This model was chosen because it has 222 buyer ratings, the 11th most of the 51 screened. Our research involves analyzing listing data to compare specific technical specifications. This review is for buyers who prioritize fast heating times for smaller, high-use pools.

The Short Answer on the Raypak 336

Best for: you need a high-capacity heating solution to maintain a usable temperature in a standard 20,000-gallon pool using a natural gas supply.

The Raypak 336 is a capable choice for these requirements at the $4849 price point.

• Pro: The 336,000 BTU heating capacity provides enough power to heat a 3,000-gallon pool quickly.
• Pro: Intermittent spark ignition pilot safety controls ensure the unit only activates when a call for heat is triggered.
• Pro: The unit features space-age material, which is a coating that prevents the unit from retaining residual heat after it is turned off.
• Con: The 230-pound weight requires a two-person lift or mechanical aid during positioning.
• Con: This model cannot be shipped to the state of California, which restricts its availability for residents in that region.

Don’t buy this if: your local utility only provides propane, as this model is specified for natural gas use.

Price assessment: The $4849 price is a premium investment for a high-output 336,000 BTU system.

To find a different style of heating, see our guide to the best solar dome swimming pool heater.

Full technical specifications for this pool thermal exchanger

Heating Capacity measures the 336,000 BTU of total heat energy transferred to the water per unit of time.

Before You Buy: Pool Thermal Exchanger Checklist

The first thing to check is your available space for the equipment pad to ensure the unit fits the footprint of your pool area.

• ☐ Measure your installation area and confirm a clearance of 44 x 31 x 31 inches — failure to do so means the Raypak 336 will not fit the designated space and require a return.
• ☐ Verify your fuel source is natural gas — this model is designed for natural gas and will not function on other fuel types.
• ☐ Confirm your pool volume and heating needs are under 336,000 BTU — if your requirements exceed this, the unit will struggle to maintain temperature.
• ☐ Check for scaling and calcification risks in your water — mineral buildup on the heat exchange surfaces reduces efficiency and can cause system failure.
• ☐ Ensure your pump provides a sufficient flow rate — insufficient turnover leads to localized overheating and potential melting of components.

You should not buy this product if you require a propane-compatible heater or if your pool requires a heating capacity higher than 336,000 BTU.

Learn more about the core technology by viewing different types of pool heat exchangers explained.

What These Specifications Let You Do

On-Demand Pilot Activation

The Raypak 336 provides 336,000 BTU of heating capacity, which is enough to heat a 20,000-gallon pool to a usable temperature or heat a 3,000-gallon pool quickly. This output level allows you to maintain a consistent temperature even in larger bodies of water because the high BTU rating ensures the system generates enough heat energy to overcome environmental cooling. Like a high-capacity furnace for your water, this capacity ensures the pool reaches your target temperature without running indefinitely.

The intermittent spark ignition pilot safety controls ensure the pilot activates only when there is a call for heat. This means the system manages its energy consumption by only engaging the primary heating mechanism when the thermostat demands it, rather than running a pilot constantly. Because the unit uses natural gas, this specific control setup helps manage the fuel flow to meet your specific heating requirements for the pool or spa.

How specialized alloy materials prevent residual heat retention

The Raypak 336 uses space-age material (a specialized alloy designed to minimize heat loss) that does not retain residual heat after being turned off. This means that once you stop the heating cycle, the internal components cool down quickly rather than staying hot, which prevents the unit from continuing to radiate unnecessary heat into the surrounding area. This material choice ensures the heat you pay for stays in the water rather than lingering in the hardware.

Because this material prevents heat soak, you can cycle the heater on and off more precisely to maintain your desired temperature. This characteristic is useful for maintaining a steady environment in a spa or pool where rapid temperature fluctuations are undesirable. By ensuring the unit is “off” when it is off, the system supports a more controlled heating environment for your specific water volume.

Simplified installation without the need for metal heat sinks

The Raypak 336 requires no metal heat sinks for installation, which simplifies the physical footprint of the unit. This design choice means the unit can be positioned more easily in your designated space since it does not require the additional structural support or clearance that heavy heat-dissipating fins usually demand. You can plan your layout around the 44 x 31 x 31 inch dimensions without worrying about bulky external components.

The unit weighs 230 pounds and is designed for natural gas, meaning you must confirm your gas line’s capacity and local piping requirements before the installation begins. Because the fitting is a job for a qualified installer wherever local rules require one, you should verify your gas pressure and flow rates with a professional to ensure they match the 336,000 BTU requirement. The absence of external heat sinks makes the unit more compact, but the weight still requires a stable, level surface for the final placement.

The Raypak 336 Job by Job: What Its Figures Cover

The Raypak 336 against the jobs buyers ask about, worked out from its listed heating capacity and a typical need for each job.

The Raypak 336 Against Similar Pool Heat Exchangers

The Raypak 336 provides a high heating capacity of 336,000 BTU, which is sufficient to heat a 20,000-gallon pool or a spa to 104 degrees in 2 hours. This unit uses natural gas and includes an intermittent spark ignition pilot safety control, which activates only when there is a call for heat.

Comparison to Similar Pool Heat Exchangers

The Raypak 336 offers a high-output heating capacity that matches several other options in our comparison.

• The Raypak Propane Pool Heater provides 406,000 BTU, which is 70,000 BTU larger than the Raypak 336.
• The Pentair MasterTemp Propane Gas Pool Heater provides 400,000 BTU, which is 64,000 BTU larger than the Raypak 336.
• The Raypak Digital Propane Gas Pool Heater matches the Raypak 336 with a heating capacity of 336,000 BTU.
• The Smart Pool S601 Inground Pool Solar Heating System is $1,100 cheaper than the Raypak 336.

If you prefer a solar-based system over gas, the Smart Pool S601 Inground Pool Solar Heating System is the alternative to consider.

If you need a different capacity, read our full review of the Raypak 266.

You can also supplement your heating by looking at how SunQuest Solar Panels perform.

Setting Up This Pool Heat Exchanger, and What Support Covers

Natural gas supply and space requirements for installation

Before the Raypak 336 can function, you must have a natural gas supply connection established at the installation site.

1. Unpack the unit and position it within a space that accommodates the 44 x 31 x 31 inch dimensions.
2. Connect the gas line to the unit using a fitting compatible with natural gas infrastructure.
3. Attach a PVC bonding coupler to the heater to link it to your pool plumbing lines.
4. Install a pressure gauge to monitor system pressure and prevent pipe bursts or leaks.
5. Mount the unit and connect a circulation pump to move water through the heating system for consistent temperature.

Incorrectly sized plumbing connections or a lack of a circulation pump can result in an expensive rebuild of the heating circuit.

Warranty and Support: What to Check

Warranty coverage and support terms vary by seller and country.

• Confirm the heat output matches the 336,000 BTU rating to ensure it meets your pool’s volume requirements.
• Verify the gas connection integrity to prevent leaks that could damage the internal components.
• Check that all plumbing connections are secure to avoid water damage to the surrounding area.

Perform a test run of the heater and check for any leaks or unusual noises the day it arrives while the return window is still open.

Raypak 336 Buying Questions Answered

Raypak 336

The Raypak 336 provides a 336,000 BTU heating capacity, which is enough to heat a 20,000-gallon pool to a usable temperature. While many buyers assume a high-output gas heater requires a massive footprint, this unit measures 44 x 31 x 31 inches and weighs 230 pounds. It uses natural gas to provide the thermal energy required for large-scale pool heating.

Safety controls on the Raypak 336 include an intermittent spark ignition pilot. This system ensures the pilot activates only when there is a call for heat, reducing the risk of a constant flame. The unit also features a space-age material that does not retain residual heat after it is turned off, which helps the surface cool down quickly after use.

If you are located in California, you cannot have this product delivered to your home. The manufacturer explicitly restricts shipping to the state of California, so you must verify your location before ordering. For all other regions, the Raypak 336 provides a high-output solution for large water volumes.

Can I actually get this delivered to my house?

No, the Raypak 336 cannot be shipped to the state of California. This shipping restriction applies to all customers in that state, so you must confirm your delivery address is outside of California before purchasing.

Is the pilot light system actually safe for my home?

Yes, the Raypak 336 uses an intermittent spark ignition pilot safety control. This design means the pilot light only activates when the system calls for heat, rather than remaining lit constantly.

Is the Raypak 336 Right for You?

Who the Raypak 336 suits and the jobs it is the wrong choice for, listed below with the reason for each.

Where to Buy This Pool Thermal Exchanger

In November 2026 the Raypak 336 was listed at $4849. Prices move, so read that as a snapshot, not a quote.

Pool heat exchangers are sold by the retailers below – we do not track which of them has the Raypak 336 in stock, so check availability and the current price with the retailer before making a trip.

• 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
• 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

Final Verdict on the Raypak 336

If you need to heat a 20,000-gallon pool to a usable temperature, the Raypak 336 provides a heating capacity of 336,000 BTU. This capacity is sufficient to maintain a usable temperature in a standard 20,000-gallon pool, which requires a minimum of 150,000 BTU.

You should determine your required heat output based on your pool’s volume and the desired temperature. If your requirements are under 336,000 BTU, this unit provides enough capacity to meet those needs.

The Raypak 336 operates on natural gas, a fuel type used by 8 of the 51 screened listings. It features an intermittent spark ignition pilot safety control, which is a system that only activates when there is a call for heat to improve safety and efficiency.

You should confirm your local fuel infrastructure supports natural gas before ordering. Because this unit cannot be shipped to the state of California, you must verify your location is eligible for delivery.

If you need to heat a pool using natural gas or propane, the 336,000 BTU capacity is enough to meet the 100,000 to 300,000 BTU requirement for those fuels. The unit also provides enough capacity to heat a spa to 104 degrees in 2 hours, a task requiring 40,000 to 60,000 BTU.

You should measure your available space to ensure it can accommodate the 44 x 31 x 31 inch dimensions. The unit weighs 230 pounds, which is a factor for your installation site’s floor or mounting requirements.

You should choose the Raypak 336 if you have a large pool and a natural gas supply, as it provides 336,000 BTU of heat output for around $4,849. This model is designed for high-volume heating where significant output is necessary to maintain consistent temperatures.

The 336,000 BTU heating capacity is the primary reason this unit works for large-scale applications, providing more than double the 150,000 BTU minimum required for a standard 20,000-gallon pool. It also maintains a 3.9 average across 222 buyer ratings.

Skip it if: You live in California or require a system that runs on a fuel source other than natural gas.