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Sta-Rite SR400HD Max-E-Therm Natural Gas Pool Heater 400k BTU

This product is available in-store only.
Price in points: 93000 points

Quick Overview

Sta-Rite Max-E-Therm 400 is excellent if you are looking for a lot of power in a small package. It's able to heat pools as large as 20' x 40' while staying true to Sta-RIte's energy efficient approach. With best efficiency in its class and a whole lot of power, Sta-Rite Max-E-Therm 400HD is sure to do the job! The Max-E-Therm HD Series heaters are able to operate at 100 or 220 volts. Their flexible and lightweight plumbing, combined with a compact design makes installation easy and the heavy-duty cupro-nickel heat exchanger option now available on 400,000 BTU models.

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Sta-Rite SR400HD Natural Gas Pool Heater

Running a pool each summer is a big investment, and it can be frustrating when the summer weather isn't everything we hope it will be. Cool days can prevent your pool from ever warming up during the summer, leaving you with a pool that is too cold for your family members to enjoy. When you add a heater to your pool, you have more control over the duration of the season - opening earlier, closing later, and enjoying late-evening swims.

The Sta-Rite Max-E-Therm heater has been specifically designed to perform in saltwater pools, providing a comfortable swimming experience each and every day of the summer.

Why choose the Sta-Rite Max-E-Therm Natural Gas Pool Heater?

If you have a saltwater pool, or if you're considering making the switch in future, it is important that you choose a pool heater that has been designed to handle the different water chemistry in salt water. Though high-salt water feels more comfortable for our hair and eyes, the high salinity is actually very corrosive for pool equipment, and can destroy a heater that was intended for a traditional chlorine pool.

This natural gas pool heater has been designed with a special cupro-nickel heat exchanger that can withstand high-salt pools, and provide all of the longevity and efficient service that you'd expect from your pool heater. The Max-E-Therm heater is extremely efficient, providing affordable heat that far exceeds safety standards.

One of the best things about the Max-E-Therm heater is how compact and low-profile it is! Anyone who is low on space or looking for a small heater will love how small, yet powerful, this Sta-Rite model is.

Affordable and Compact Pool Heating

If you're on the market for a new heater for your pool, be sure to consider the Sta-Rite Max-E-Therm heater. This powerful, low-profile heater is strong enough to warm a pool up 20' by 40, while maintaining efficiency standards that keep your costs low. This summer, take more control over when you open your pool, close your pool, and how comfortable you and your family can be each day with the Max-E-Therm heater.


  • Heavy Duty Cupro-Nickel Heat Exchanger suitable for use in saltwater pools.
  • Heats large pools up to 20 x 40 feet in size.
  • Best in class energy efficiency. Standard Copper Heat Exchanger 84% efficient. Heavy-Duty (HD) Cupro-Nickel Heat Exchanger 82% efficient.
  • Lower Operating Costs - 84% efficiency rating of Sta-Rite SR400 means lower energy consumption and in turn lower costs for you.
  • Environmentally Friendly - All SR400 units are low NOx .
  • Compact design - smaller than other heaters of similar power.
  • Lightweight, yet durable construction lets the unit withstand the harshest of utilizations, such as to low pH, high flow and heavy use.
  • Rust-resistant casing - sleek, matte dark housing is made of Dura-Glas - a high-end material that can resist the heat and cold of the elements.
  • Simple to Switch - Change gas sources with installation of separate orifice.

For residential use only.

Manufacturer Warranty: 2 Years

Dual Voltage
Heater Fuel:
Natural Gas
Heater Pool Type:
Suitable for Saltwater:
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NOTE: Product images are for illustration purposes only and may not exactly match the actual product due to seasonal model, color or design changes. When shopping for parts we strongly recommend to check the SKU or "Part Number" which is listed on each product page. If you are unsure whether this is the correct product or need assistance please contact us.

Just a quick reminder - Toronto Pool Supplies is an online-only store. Our Concord, ON location is a pickup point, not a retail store and we cannot service walk-in customers. If you want to pick up your items in person please place an order online first and we will email you when it's available for pickup.

Hours: Mon-Wed: 9AM-6PM / Thu: 9AM-8PM (Extended) / Fri: 9AM-6PM