Product Overview
The Pentair ETi 400 High-Efficiency Natural Gas Heater is a premium 400,000 BTU pool and spa heater built for fast heat-up times, energy savings, and long-lasting performance. Designed with Pentair’s Titan-Tough™ Direct-Fire Titanium Heat Exchanger, the ETi 400 delivers exceptional corrosion resistance and dependable heating power for demanding residential and commercial pool applications.
With 96% thermal efficiency, ultra-quiet operation, indoor/outdoor installation capability, and flexible plumbing and gas connection options, the ETi 400 is one of Pentair’s most advanced gas heater platforms for customers who want powerful heating with reduced energy waste.
Ideal For
In-ground swimming pools and spas
Customers upgrading to a high-efficiency gas heater
Pool owners who want faster heat-up times
Natural gas pool and spa systems
Indoor or outdoor heater installations
Residential and commercial pool applications
Systems requiring Pentair model 461113
Key Features
400,000 BTU Heating Power
The ETi 400 provides high-output 400K BTU performance, helping pools and spas reach target temperatures quickly when properly sized and installed.
96% Thermal Efficiency
With 96% thermal efficiency, more of the natural gas consumed by the heater is converted directly into pool heat, helping improve energy performance compared with standard-efficiency gas heaters.
Titan-Tough™ Direct-Fire Titanium Heat Exchanger
Pentair’s titanium heat exchanger is built for durability, corrosion resistance, and long-term reliability in pool and spa heating environments.
ASME-Certified Heat Exchanger Construction
The ETi 400 is built with ASME-certified heat exchanger construction, making it suitable for demanding residential and commercial pool applications where code or project requirements may call for ASME-rated equipment.
Natural Gas Operation
This model is designed for natural gas systems and should be installed only where the gas supply, pressure, ventilation, and local code requirements match the heater specifications.
Indoor and Outdoor Rated
The ETi 400 is rated for both indoor and outdoor applications, giving pool professionals more installation flexibility when used with the correct venting and combustion-air configuration.
Ultra-Low NOx Certified
The heater is certified for ultra-low NOx emissions, making it suitable for many regions with stricter emissions requirements.
Flexible Installation Design
The ETi 400 includes installation-friendly features such as rotating controls, front and rear gas connection capability, and flexible orientation options for plumbing and gas line setup.
Ultra-Quiet Operation
Pentair designed the ETi 400 for quiet performance, helping reduce equipment pad noise while still delivering powerful pool and spa heating.
Benefits
Heats pools and spas quickly with 400,000 BTU output
High-efficiency design helps reduce wasted energy
Titanium heat exchanger supports long-term corrosion resistance
Excellent option for premium residential and commercial pool systems
Indoor/outdoor rating gives installers more layout flexibility
Ultra-low NOx certification supports cleaner operation
Quiet operation helps improve the backyard pool experience
Strong replacement choice when the system calls for Pentair 461113
Specifications
| Specification | Details |
|---|---|
| Brand | Pentair |
| Product Line | ETi 400 |
| Product Type | High-Efficiency Pool & Spa Gas Heater |
| Model / Manufacturer Part Number | 461113 |
| Fuel Type | Natural Gas |
| Ignition Type | IID |
| BTU Output | 400,000 BTU |
| Thermal Efficiency | 96% |
| Heat Exchanger Material | Titanium |
| Heat Exchanger Construction | ASME Certified |
| Application | Pool, Spa |
| Installation Rating | Indoor / Outdoor |
| Electrical | 120/240V, 60Hz, 1 Phase |
| Listed Amperage | 15 AMP |
| Minimum Flow Rate | 40 GPM |
| Maximum Flow Rate | 120 GPM |
| Cabinet Dimensions | Approx. 39.9 in. W x 45.7 in. H x 30 in. D |
| Listed Product Weight | Approx. 379 lb |
| Emissions | Ultra-Low NOx Certified |
| Commercial / Residential Use | Commercial, Residential |
| Pool Type | In-Ground |
| SKU | 461113 |
| UPC / Barcode | 788379877248 |
Customer-Facing Q&A
Q: What fuel type does the Pentair ETi 400 461113 use?
A: This model is designed for natural gas.
Q: How many BTUs is this heater?
A: The ETi 400 is rated at 400,000 BTU.
Q: Is this a high-efficiency heater?
A: Yes. Pentair lists the ETi 400 with 96% thermal efficiency, making it a high-efficiency gas pool and spa heater.
Q: What makes the ETi 400 different from a standard gas heater?
A: The ETi 400 uses Pentair’s direct-fire titanium heat exchanger, high-efficiency combustion design, ultra-quiet operation, and flexible installation features.
Q: Can this heater be installed indoors?
A: Yes, it is rated for indoor and outdoor installation, but indoor installations must follow Pentair venting instructions, combustion air requirements, and all local codes.
Q: Is this heater for pools, spas, or both?
A: It is designed for both pool and spa heating applications.
Q: Is the heat exchanger titanium?
A: Yes. The ETi 400 features a direct-fire titanium heat exchanger for durability and corrosion resistance.
Q: Is professional installation required?
A: Yes. Gas pool heaters should be installed and serviced by qualified pool heater professionals and licensed trades where required.
Q: What is the correct Pentair part number?
A: The manufacturer part number for this natural gas ETi 400 model is 461113.