ETi 400 High Efficiency Gas Pool Heater - TradeGrade

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ETi® 400 High-Efficiency Pool and Spa Heater



The ETi 400 efficiently heats your pool with a blazing-fast performance to reach your target temperature in a snap. Equipped with the industry-exclusive TitanTough™ Direct-Fire Titanium Heat Exchanger, the toughest heat exchanger ever built, the ETi 400 can deliver years of reliable heating. And with 96% thermal efficiency, more of every dollar you spend goes directly into heating your pool. Paired with simplified installation and an ultra-quiet noise level, the ETi 400 can make your backyard oasis warmer and cozier for years to come.

Key features and benefits:

  • Corrosion-resistant TitanTough Direct-Fire Titanium Heat Exchanger is the strongest heat exchanger ever built—for years of high-quality, trustworthy warmth.
  • 96% thermal efficiency, the highest efficiency ever built in its class. For every $1 of natural gas that’s piped into the heater, 96 cents go directly to heating your pool, so you get more bang for your buck.
  • Flexible installation features, including orientation options for gas line connection.
  • Quick access to keypad controller for user convenience.
  • Large removable panels make accessing the heater internals quick and easy.
  • 3-year parts and labor warranty.
  • ETi 400 is 400,000 BTUs (BTU is the quantity of heat needed to raise one pound of water by one degree Fahrenheit). The higher the BTUs, the higher the heating power, and the faster your pool can heat up.
Find out where to purchase online or in a retail location near you.
Where to Buy




Save up to 14% on energy costs compared to a traditional gas heater.



The ETi 400 is designed to accommodate the features that make your pool fun.  



Heats up quickly and efficiently by keeping For every $1 of natural gas that’s piped into the heater, 96 cents goes directly to heating your pool.  



Plumbing aligns to MasterTemp® High Performance Heater, for easy drop in replacement.

Pentair ETi 400 high efficiency pool heater is the first pool heater with a pure titanium heat exchanger.
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Product Components

  1. Stands up to the toughest conditions 1,800° F flame temperatures and pool water chemistry are all in a day’s work for titanium.
  2. Design elements that boost durability and efficiency. No welds, crimps or joints that reduce corrosion resistance. Tubing is shaped for maximum flow and efficiency.
  3. Industrial chemical processors lean on titanium. When handling concentrated chlorine compounds, industrial processors rely on the corrosion resistance of titanium piping and heat exchangers.

Unmatched Durability and Efficiency

  1. EASY TO VENT PROPERLY: Fully sealed Category IV direct-air vent does not require large room openings for combustion air
  2. ULTRA-QUIET OPERATION: Great for you, great for your neighbors
  3. INSTALL IN LEFT OR RIGHT ORIENTATION: Rotatable front door allows control pad to be rotated 180 degrees, so this heater can be plumbed on the right- or left-hand side
Pentair ETi 400 high efficiency pool heater is 96% efficient.
Pentair ETi 400 high efficiency pool heater uses pure titanium in its heat exchanger to increase efficiency and reduce corrosion.

A Metal That Gets Respect

Titanium is known for excellent corrosion resistance, high strength and light weight. The job of the heat exchanger is to capture the heat from burning gas and transfer it to your pool’s water—the more efficiently, the better. But, the combination of operating heat and pool water chemistry can be tough on exchangers, leading to corrosion and failure. That’s why we made the ETi 400 High-Efficiency Heater’s direct-fire heat exchanger from titanium. It provides long life under extreme conditions.

Shivers Say Goodbye, Heat Say Hello

With the ETi 400 and ETi 250 high efficiency heaters, say goodbye to those icy pool shivers and hello to cozy temperatures year round. Heating options are available to suit any pool or spa, allowing you to have the warm and inviting backyard oasis of your dreams.




Item #DescriptionGas TypeBTUsDIMENSIONSWeight (LBS)VoltageBreaker Size
461113ETi 400 High-Efficiency Pool HeaterNatural400,00030L x 34W x 42H379120 or 240/60Hz/1Ph15 AMP
Item #DescriptionGas TypeBTUsDIMENSIONSWeight (LBS)VoltageBreaker Size
461113ETi 400 High-Efficiency Pool HeaterNatural400,00030L x 34W x 42H379120 or 240/60Hz/1Ph15 AMP
  • 476072 ETi 400 Natural Gas to Propane Conversion Kit - The ETi 400 heater is factory-configured for use with Natural Gas. For applications using Propane Gas, this conversion kit is required.
  • 475612 - ETi 400 Condensate Neutralizer Replacement Kit - ETi 400 heater produces condensate while in operation. The pH level of the condensate is between 3.1 and 4.2, and Pentair recommends that users neutralize the condensate by installing the optional ETi 400 Condensate Neutralizer Kit.
  • 475931 - ETi 400 Indoor Direct Air Intake Kit - For applications in which the ETi 400 will be installed indoors using a Direct Air Intake, use this kit for simplified installation.

*Pentair has a trained team of TradeGrade experts and third-party resources that will be scouring the internet 24/7 for TradeGrade violations. Our guarantee to you is that we will use all resources at our disposal to actively monitor and enforce this policy.If a TradeGrade product is sold online, the warranty will be limited to a 60-day limited warranty. Pentair will not be liable for any costs or expenses related to an extended warranty provided to a customer beyond the 60-day limited warranty that Pentair provides for such sales. Additionally, no PIP dollars will be rewarded to the dealer for the purchase. When a TradeGrade product is purchased and sold in compliance with the TradeGrade policy, that product will receive the full product warranty.

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