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Pentair ETi400 Pool & Spa Heater

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The ETi 400 efficiently heats your pool with a blazing-fast performance to reach your target temperature in a snap.

Product Description

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 more comfortable for years.

Key Features

  • 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 piped into the heater, 96 cents go directly to heating your pool, giving you more bang for your buck.
  • Flexible installation features, including orientation options for gas line connection.
  • Quick access to the keypad controller for user convenience.
  • Large removable panels make accessing the heater internals quick and easy.
  • 3-year parts and labour 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.

Pentair ETi400 Benefits


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

No Cold Feet

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

Optimised Heating

For every $1 of natural gas piped into the heater, 96 cents goes directly to heating your pool.

Upgrade Option

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

ETi400 Components

Pentair Eti400 Diagram
  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 & Efficiency

Pentair Eti400 Spa Heater
  1. Easy to vent properly: Fully sealed Category IV direct-air vent does not require large room openings for combustion air
  2. Ultra quiet operationGreat for you, great for your neighbours
  3. Install in left or right orientation: The rotatable front door allows the control pad to be rotated 180 degrees so that this heater can be plumbed on the right- or left-hand side

No more shivers!

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.


Eti400 Dimensions

At Discount Pool Heating, we pride ourselves on matching the best product to our customer’s needs. Our prices are so competitive, we can’t even advertise them! For the best price, contact us directly!

Additional Info



Limited Time Special

Heatseeker NovaS 10KW Heat Pump

$3700 $2520 Cash!

Dive into a warm pool this season without breaking the bank! That’s right—upgrade from the usual 9kw model, regularly priced at $3,700, and save big! Act fast! This unbeatable price is only available for a limited time.

Contact us while stocks last
Heatseeker Nova S