Product Overview

The Pentair ETi® 400 High-Efficiency Natural Gas Pool and Spa Heater delivers rapid heating, premium corrosion resistance, and up to 96% thermal efficiency. Its Titan-Tough™ direct-fire titanium heat exchanger is designed to withstand demanding pool environments while transferring more heat into the water and reducing wasted energy.

Built for residential and commercial in-ground pools and spas, the ETi 400 features ASME-certified construction, flexible venting options, digital controls, and ultra-low NOx operation. Model 461113 is configured for natural gas and produces 400,000 BTU of heating power.

Key Features

400,000 BTU natural gas heating

Up to 96% thermal efficiency

Titan-Tough™ direct-fire titanium heat exchanger

ASME-certified construction

Ultra-low NOx emissions

Fast pool and spa heating

Digital temperature controls

Dual-voltage 120V/240V operation

Fully sealed Category IV direct-air venting

Front or rear gas connection capability

Compatible with supported pool automation systems

Suitable for residential and commercial applications

Corrosion-resistant outdoor enclosure

Ultra-quiet operation

Benefits

Heats pool and spa water quickly

Converts more fuel into usable heat

Titanium construction provides excellent corrosion resistance

Suitable for properly maintained saltwater pools

Flexible installation and venting configurations

Digital controls provide precise temperature management

Reduces operating costs compared with less efficient gas heaters

Specifications

What’s Included

• Pentair ETi 400 natural gas heater
• Factory-installed titanium heat exchanger
• Digital control system
• Installation and operation documentation

Gas piping, venting materials, plumbing fittings, electrical components, automation accessories, and installation labor are not included unless specifically stated.

Warranty & Compatibility

Installation Information

This heater must be installed and serviced by a qualified pool professional. Installation must comply with local gas, electrical, plumbing, ventilation, and building codes.

Before ordering, verify the fuel type, gas supply capacity, gas pressure, electrical service, plumbing size, equipment-pad clearance, venting requirements, and heater sizing. Improper installation or operation may damage the heater and void the manufacturer’s warranty.

Warranty Information

The Pentair ETi 400 includes a three-year limited parts and labor manufacturer warranty when purchased, installed, registered, and operated in accordance with Pentair’s current warranty and TradeGrade requirements.

Warranty coverage is subject to Pentair’s complete terms and exclusions. Proof of purchase, product registration, and proof of professional installation may be required.

Pentair TradeGrade products sold online outside the authorized TradeGrade policy may receive reduced warranty coverage. Damage caused by improper installation, incorrect gas pressure, poor water chemistry, freezing, misuse, or unauthorized modifications is not covered.

Freight Delivery Notice

This product ships by freight. Inspect the heater and packaging before signing the delivery receipt. Note all visible damage on the carrier’s paperwork and take photographs immediately.

Do not sign for a visibly damaged shipment as being received in good condition.

Customer-Facing Q&A

Q: What fuel does model 461113 use?
A: This model is factory-configured for natural gas.

Q: How efficient is the ETi 400?
A: It provides up to 96% thermal efficiency.

Q: Can it be used with saltwater pools?
A: Yes. The titanium heat exchanger is suitable for properly maintained saltwater pools.

Q: Can it be installed indoors?
A: Yes, when installed with the required Category IV venting and combustion-air configuration.

Q: Is professional installation required?
A: Yes. A qualified pool and gas professional should install and commission the heater.