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AQUA Magazine


The Pentair ETi 250 transforms your pool into the spa you've been longing for. With quick heat-up times and durable TitanTough Direct-Fire Titanium, the toughest heat exchanger material, effectively warm up your pool. A great replacement for the Pentair MasterTemp High Performance Heater, with the same plumbing alignments to effectively serve your backyard oasis needs. Say goodbye to those after pool shivers and hello to a cozy and warm backyard spa.

Pentair Item Code: 461112

Pentair ETI 400 Canada

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 

EASY TO VENT PROPERLY: Fully sealed Category IV direct-air vent does not require large room openings for combustion air

ULTRA-QUIET OPERATION: Great for you, great for your neighbors

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

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 250 High-Efficiency Heater’s direct-fire heat exchanger from titanium. It provides long life under extreme conditions.

ETi 400 & ETi 250 Family Brochure - English
ETi 250 Installation and User Guide - English


  • 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 250 is 250,000 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.