Max-E-Therm Heater 333,000 BTU - NG - Ele Ign Low NOx - SR333NA


Model # SR333NA

By Sta-Rite



Model # SR333NA

Product Description

Sta-Rite Max-E-Therm Pool and Spa Heaters are certified for outdoor or indoor installation. Features include an LCD temperature readout with dual thermostat controls, temperature safety lockout, and 6 position control panel. PMG burner technology requires no outdoor draft hood. Proven Dura-Glas Resin provides rust-proof construction.


  • Rust-Proof Enclosure - Unlike conventional metal enclosures, the Max-E-Therm is made of Dura-Glas® - a sleek, lightweight and rustproof material that withstands heat and the elements.
  • Exact Temperature Controls - Weatherproof temperature controls that can be set to your specifications.   Pivoting UV-resistant plastic visor covers the Digital Display.   Accommodates temperatures for both a pool and a spa running off of the same heater, in Fahrenheit (°F) or Celsius (°C).
  • Energy Efficient - PMG combustion technology improves Efficiency and reduces operating costs.  Also provides faster heat ups.  The three sizes available are 83% efficient or higher.
  • Safety - Internal safety feature sets maximum temperature levels.  Full diagnostic lights for troubleshooting problems.  The diagnostic indicator lights tell you whether to service the heater or the pump/filter system.
  • Environment Friendly - Exceeds all air pollution standards.  Electronic ignition enables you to never worry about a pilot light blowing out or leaking gas.
  • Proven Sta-Rite Technology - The Max-E-Therm Heater is the newest member in our family of advanced technology pool and spa products.  Our quality pumps and filters have been used for years to enhance the enjoyment of pools and spas nation wide.
  • Warranty - 2 years parts & labor

Product Specifications

333,000 BTU
Heat Exchanger:
Special Feature:
Low NOx Emission

?     Asked on 5/26/2018 by

What size gas line do I need for the 333,000 but unit?

A  Answered on 5/27/2018 by InyoPools Product Specialist Lennox H.

Hi. The gas line will be based on the run from the regulator to the unit then downsized to 3/4" at the gas valve. You can use the chart(s) on page 14 of the Max-E-Therm Owner's Manual.

?     Asked on 1/16/2012 by Guest

Will a gas heater operate at the low speed of a dual speed motor?

A  Answered on 1/16/2012 by InyoPools Product Specialist Patrick P.

Probably not - Most gas heater will shut off at low GPM levels (20-40) to keep the heater cores from overheating - 20 for 200 BTUs, 40 for 400 BTUs. Depending on your pool system you might get these GPM levels at the low speed but generally these heaters must be run at the motor's high speed.

?     Asked on 3/29/2008 by Guest

Is the sta-rite heater Max E Therm low NOx rated for Texas?

A  Answered on 3/29/2008 by InyoPools Product Specialist Patrick P.

Yes the Sta Rite Max E Therm heaters are LoNox rated for Texas and California.