Pentair Sta-Rite Max-E-Therm Low NOx Pool and Spa Heater | SR333NAPentair Sta-Rite Max-E-Therm Low NOx Pool and Spa Heater, Natural Gas, 333,000 BTU, SR333NA In stock$4,36299
Pentair Sta-Rite Max-E-Therm Low NOx Pool and Spa Heater | SR333NA
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Pentair Sta-Rite Max-E-Therm Low NOx Pool and Spa Heater, Natural Gas, 333,000 BTU, SR333NA

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Quick overview

  • Brand and number Pentair Sta-Rite Max-E-Therm model SR333NA, a natural gas pool and spa heater.
  • 333,000 BTU, natural gas A 333,000 BTU heater built for natural gas.
  • Low NOx All Max-E-Therm units are low NOx.
  • Dual electronic ignition and digital display An LED temperature readout with dual thermostat controls and a 6-position control panel.
  • 84% efficiency rating Rated by the manufacturer at 84% efficiency.
  • Indoor or outdoor Installs indoors or outdoors at elevations from 0 to 9000 ft, and the PMG burner needs no outdoor draft hood.
Full description and specifications ↓

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Product details

The Pentair Sta-Rite Max-E-Therm SR333NA is a 333,000 BTU low NOx natural gas pool and spa heater with dual electronic ignition and a digital display, made for indoor or outdoor installation.

What it does

The heater warms pool and spa water with an LED temperature readout, dual thermostat controls, temperature safety lockout and a 6-position control panel. Its PMG burner technology requires no outdoor draft hood. Pentair rates the Max-E-Therm line at 84% efficiency, and all units are low NOx.

Construction and rating

The housing is Dura-Glas, a rust-proof material, with a plastic manifold and PVC union connections. The heat exchanger is cupro-nickel, built to stand up to low pH, high flow or heavy use. The SR333NA is rated for elevations from 0 to 9000 ft and connects directly to a System 3 modular media filter or fits other systems.

Before you order

The SR333NA is the natural gas model. Gas source can be changed with a separate orifice, but order the model that matches your fuel and have the installation done to the local gas code. The manufacturer part number is SR333NA.

Specifications
Brand Pentair
Manufacturer part number SR333NA
UPC 022315208308
Series Sta-Rite Max-E-Therm
Type Pool and spa heater, low NOx
Output 333,000 BTU
Fuel Natural gas
Ignition Dual electronic ignition
Display LED temperature readout with dual thermostat controls
Efficiency rating 84%
Heat exchanger Cupro-nickel
Housing Dura-Glas, rust-proof
Installation Indoor or outdoor
Elevation 0 to 9000 ft
Shipping weight 128 lb
Ships Freight

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Questions and answers

What people ask about this product, answered by our pool techs.

What fuel does the Pentair Sta-Rite Max-E-Therm SR333NA use?
The SR333NA is the natural gas model, rated at 333,000 BTU.
Can the SR333NA be installed outdoors?
Yes. It is made for indoor or outdoor installation on pools and spas, and its PMG burner technology needs no outdoor draft hood.
What elevation is the SR333NA rated for?
It is rated for elevations from 0 to 9000 ft.
What kind of heat exchanger does the SR333NA have?
It has a cupro-nickel heat exchanger, built for demanding conditions such as low pH, high flow or heavy use.
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