Sta-Rite Max-E-Therm 400 In-Ground Pool Heater by Pentair

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Sta-Rite Max-E-Therm 400 In-Ground Pool Heater by Pentair

400,000 BTU Heater for 650 - 1,000 SqFt Swimming Pools

ID#: MAX-E-THERM-400
Brand: Pentair Water Pool and Spa
SKU#: SR400NA/LP

Retail Price: $6,997.99
Our Price: $4,272.95
You Save $2,725.04 or 38.94%

Gas Type
Manifold By-Pass Valve Kit
Pressure Relief Valve

Availability: Usually ships in about 1 week.


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How the Max-E-Therm 400,000 BTU Gas Pool Heater is expected to Ship.

Features of Max-E-Therm 400,000 BTU Gas Pool Heater

  • Lightweight - lightest heater in its class
  • Best in class energy efficiency
  • Compact design - ideal for retro-fit installations
  • Easy to switch - change gas sources with installation of separate orifice
  • Environmentally friendly - all units are low NOx
  • Rustproof housing - sleek, matte black enclosure is made of Dura-Glas®
  • Lower operating costs - 84% efficiency rating - rated first in its class for highest energy efficiency
  • Can direct-connect to Sta-Rite® System:3® Mod Media filter or easily fits other filter systems
  • Certified for outdoor and indoor installations
  • Cabinet Height: 30.03 inch
  • Cabinet Depth: 31.69 inch
  • Cabinet Width: 25.15 inch
  • Flow Rate: Min 40 gal/min / Max 120 gal/min



Benefits of Max-E-Therm 400,000 BTU Gas Pool Heater

  • 400,000 BTU Output: Delivers rapid heating for large pools and spas, so you spend less time waiting and more time enjoying.
  • Energy-Saving Smart Bypass (optional): Automatically diverts water flow when heating isn't needed, helping save up to 35% in annual operational costs.
  • Advanced Ignition Control Module: Includes a flame strength sensor for consistent and reliable ignition, even in challenging conditions.
  • Compatible with Pentair IntelliCenter® Control System (Not Included): Lets you manage your pool heater remotely - from across the yard or across the globe.
  • Real-Time Alerts: Sends performance updates and diagnostics to your smart device, so you're always in the loop.
  • Full-Text Digital Display: Offers intuitive navigation with a clear menu system for easy setup and troubleshooting.
  • Diagnostic Capabilities: Helps identify issues quickly, reducing downtime and service costs.
  • Compact, Lightweight Housing: Designed for easy installation and space-saving placement.
  • Corrosion-Resistant Construction: Ideal for coastal or humid environments, extending the life of the unit.

Max-E-Therm 400,000 BTU Gas Pool Heater Product Reviews

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Sta-Rite Max-E-Therm 400 In-Ground Pool Heater by Pentair

400,000 BTU Heater for 650 - 1,000 SqFt Swimming Pools


The Max-E-Therm 400 pool heater puts the latest technological advances to work to heat your pool quickly, efficiently, and with less pollution. This state-of-the-art heater is the most energy-efficient pool heater you can buy, saving you money and time by heating quicker. Its high efficiency design eliminates the need for an outdoor draft hood. Indoor applications can be vented out the side for easy installation. This heating dynamo is encased in a rust-proof, Dura-Glas® composite shell that can withstand heat and weather and looks great year after year. It will never rust. Hi-tech PMG burners are not only designed for ultra high efficiency, but are rugged and long-lasting to give you years of dependable service without repair.

Max-E-Therm 400 Pool Heater In Use Installed Max-E-Therm 400 Installed

The hi-tech control system is the brain of the Max-E-Therm. Easy-to-read, precise digital display shows pool or spa temperature in Fahrenheit or Centigrade. Exact temperature settings are quick and easy. The control system is highly programmable, permitting two available settings - one for the pool, and one for the spa. The control panel is self-diagnostic and pinpoints any system problems for quick service and repair.

SUPER EFFICIENT MAX-E-THERM HEATS YOUR POOL QUICKLY WHILE REDUCING AIR POLLUTION

The unit is equipped with electronic ignition so you never have to worry about blowing out a pilot light or leaking gas. The unit is certified for low, NOx emissions by Southern California (SCAQMD) and Texas. Max-E-Therm heaters are available in either natural gas or propane. Put the quickest heating, highest efficiency heater to work for you this season with the advanced Sta-Rite® Max-E-Therm 400 heater from Pentair

The Pentair Sta-Rite Max-E-Therm Model 400 Pool Heater is packed with features that make it a standout choice for pool owners who want performance, efficiency, and smart control.

This heater is especially popular among pool owners who want a reliable, tech-savvy solution that doesn't compromise on power or efficiency. If you're looking to extend your swim season or just want more control over your pool's comfort, the Max-E-Therm 400 is a solid investment.



Last Updated: 08/23/2025 12:57 AM - ID:602