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The Sta-Rite Max-E-Therm is a high-performance, induced-draft gas pool and spa heater engineered for maximum output and long-term reliability. Available in 200,000 to 400,000 BTU/hr configurations, it delivers rapid water heating with 84% thermal efficiency, smart connectivity via the Pentair IntelliCenter® Control System, and a Low NOx burner design built for demanding pool environments across Canada.
The Sta-Rite Max-E-Therm delivers up to 400,000 BTU/hr with a thermal efficiency rating of 84% (standard copper heat exchanger) — making it one of the most capable high-performance pool heaters in its BTU class. Engineered with a CSA-certified, induced-draft combustion system and HSI (Hot Surface Ignition), it eliminates standing pilots while maintaining dependable ignition across all Canadian climate conditions. The Dura-Glas housing resists corrosion from UV exposure, pool chemicals, and seasonal temperature extremes common to Ontario's climate. An optional Smart Bypass Valve — paired with an IntelliCenter® automation system — diverts water flow when the heater isn't firing, reducing yearly operational costs by up to 35%.
High-performance equipment produces results only when installation is executed to specification. In Ontario, Max-E-Therm installations must comply with CSA B149.1 (Natural Gas and Propane Installation Code), the Ontario Building Code, and applicable Ontario Fire Code requirements for gas-fired appliances. Venting must be configured to Category I or Category III standards depending on installation type, with outdoor stackless or indoor duct-kit setups correctly sized for combustion air supply. Gas line sizing must meet dynamic inlet pressure requirements (minimum 4" WC, maximum 14" WC) and account for BTU load, pipe length, and elbow count. Electrical connections require a dedicated 120/240 VAC, 60 Hz, single-phase 15A circuit with proper bonding using a minimum 8 AWG solid copper conductor.
4Most Energy supplies the Sta-Rite Max-E-Therm and performs the complete installation using licensed gas technicians in Toronto, the GTA, and across Ontario. Every installation includes combustion verification, water flow and pressure switch calibration, gas leak testing, and a final operating check — ensuring the heater runs at rated efficiency from day one. Homeowners searching for pool heater installation Toronto, Max-E-Therm installation GTA, Sta-Rite pool heater replacement Ontario, or a licensed gas technician near me can rely on 4Most Energy as both the equipment supplier and certified installer.
ax-E-Therm Heaters for Pools and Spas - PDF
1-Year Limited Manufacturer's Warranty from the date of purchase — covers replacement parts when installed on a pool or spa by a licensed gas technician. 90-day warranty on the heating element. Warranty is void if installed by an unlicensed contractor, if water chemistry parameters are not maintained, or if the heater is used on a soft-sided pool. Proof of licensed installation is required to validate coverage. Freeze damage is excluded.
4Most Energy provides full installation documentation to support your warranty registration.
The Max-E-Therm is designed to perform under sustained, heavy-use conditions in both residential and light commercial pool applications. Its induced-draft combustion system precisely meters air and gas through matched orifice plates before forcing the mixture into the burner's flame holder, allowing consistent high-output firing regardless of ambient conditions.
Intelligent Ignition & Control: HSI (Hot Surface Ignition) eliminates the standing pilot entirely, reducing gas consumption and ignition failure points. The full-text digital display provides real-time water temperature, set-point, and diagnostic readouts for both pool and spa modes. Temperature range is 65°F–104°F (18°C–40°C).
Smart Connectivity: RS-485 communication protocol allows direct integration with the Pentair IntelliCenter® Control System, enabling remote monitoring and control from any smart device. Automated alerts notify the owner of heater status changes and fault conditions without requiring a service visit for diagnostics.
Smart Bypass Valve (Optional): When the heater is not actively firing, an IntelliValve® actuator diverts water around the heat exchanger, reducing pump back-pressure and unnecessary thermal cycling. Lab-tested to reduce yearly operational costs by up to 35% when paired with an IntelliFlo® VSF pump.
Corrosion-Resistant Construction: The Dura-Glas outer shell resists the UV, chemical vapour, and temperature cycling that degrades painted steel housings in pool environments. The standard copper heat exchanger is rated for pools using chlorine, bromine, or saltwater systems within specified chemistry parameters. The HD (Heavy-Duty) cupro-nickel heat exchanger is available for higher-demand or more chemically aggressive pool environments.
Low NOx Emissions: All Max-E-Therm models comply with Low NOx combustion standards, meeting environmental requirements across Canadian jurisdictions.
Multi-Safety Interlock System: Five independent safety systems — Air Flow Switch (AFS), Water Pressure Switch, High Limit Switch (HLS, trips at 135°F), Automatic Gas Shut-Off (AGS, trips at 140°F), and Stack Flue Sensor (SFS, trips at 480°F) — protect against combustion failure, insufficient flow, and overheating events.
Direct PVC Plumbing: 2" Schedule 40 PVC water connections are made directly to the manifold/header using integral union fittings, eliminating the need for heat sinks and simplifying retrofit installations.
Physical Dimensions (all models): 32" W × 30" H × 25" D (approx.) | Weight: [INSERT DATA]
Electrical: 120/240 VAC, 60 Hz, single phase | Operating draw: ~5A @ 120V / ~2.5A @ 240V | 15A circuit required (inrush)
Gas Pressure (Inlet): Minimum 4" WC, Maximum 14" WC (natural gas and propane)
Water Connection: 2" Schedule 40 PVC (integral slip unions included) | Schedule 80 CPVC for ASME models
Max Altitude: 9,000 ft (2,743 m)
Certifications: CSA International certified to ANSI Z21.56/CSA 4.7 | cULus Listed | Low NOx
Temperature Range: 65°F–104°F (18°C–40°C) for both pool and spa modes
Ignition: HSI (Hot Surface Ignition) — no standing pilot
Venting: Outdoor stackless (standard) | Indoor: Category I (vertical, negative pressure) or Category III (vertical/horizontal, positive pressure) via conversion kit
| Model | BTU/hr | Gas Type | Heat Exchanger | Min Flow | Max Flow | Efficiency |
|---|---|---|---|---|---|---|
| SR200NA | 200,000 | Natural Gas | Copper | 20 GPM | 120 GPM | 84% |
| SR200LP | 200,000 | Propane | Copper | 20 GPM | 120 GPM | 84% |
| SR200HD | 200,000 | Natural Gas | Cupro-Nickel | 20 GPM | 120 GPM | 82% |
| SR333NA | 333,000 | Natural Gas | Copper | 33 GPM | 120 GPM | 84% |
| SR333LP | 333,000 | Propane | Copper | 33 GPM | 120 GPM | 84% |
| SR333HD | 333,000 | Natural Gas | Cupro-Nickel | 33 GPM | 120 GPM | 82% |
| SR400NA | 400,000 | Natural Gas | Copper | 40 GPM | 120 GPM | 84% |
| SR400LP | 400,000 | Propane | Copper | 40 GPM | 120 GPM | 84% |
| SR400HD | 400,000 | Natural Gas | Cupro-Nickel | 40 GPM | 120 GPM | 82% |
ASME models use Schedule 80 CPVC plumbing connections. HD models feature cupro-nickel heat exchangers for high-demand or corrosive water environments.
Choosing the correct Max-E-Therm model depends on your pool volume, desired temperature rise, and acceptable heat-up time.
Max-E-Therm User's Guide - PDF
General rule for Ontario pools: Canadian outdoor pools lose significant heat overnight and between swim seasons. A correctly sized heater should be able to raise pool temperature by at least 1°F per hour.
Approximate BTU Recommendations:
Heat Exchanger Selection:
ASME Models: Required for certain commercial installations or jurisdictions where ASME pressure vessel certification is mandated. Uses Schedule 80 CPVC plumbing.
Bypass Valve Consideration: If your pool pump runs 3,000+ hours per year, adding the Smart Bypass Valve kit (P/N 462048) with an IntelliValve actuator and IntelliFlo VSF pump typically recovers its cost within 1–2 seasons through reduced pump energy use.
4Most Energy handles the complete Max-E-Therm installation from equipment delivery through commissioning.
Step 1 – Site Assessment A licensed 4Most Energy gas technician inspects the pool equipment pad, existing gas line capacity, electrical panel, and plumbing configuration to confirm the correct model and venting approach before any work begins.
Step 2 – Equipment Supply 4Most Energy supplies the Max-E-Therm unit, all required fittings, venting components (Category I or III as applicable), bypass valve kit (if selected), and permit documentation.
Step 3 – Gas Line Sizing & Connection The gas supply line is sized per CSA B149.1 requirements for BTU input — accounting for pipe diameter, total equivalent length, and existing appliance loads on the meter. A sediment trap and manual shut-off valve are installed outside the heater cabinet. All connections are leak-tested using soapy water or an approved non-flammable method.
Step 4 – Plumbing The heater is connected to the pool circulation loop using 2" Schedule 40 PVC via integral union fittings. A bypass valve is installed if selected. Chemical feeders are confirmed downstream of the heater with check valves in place.
Step 5 – Venting For outdoor installations, the heater's built-in stackless venting is confirmed to comply with Ontario and CSA clearances — minimum 10 ft from any building opening (Canada requirements). For indoor or shelter installations, the appropriate Category I or III vent kit is installed and tested.
Step 6 – Electrical A dedicated 120 or 240 VAC, 60 Hz, 15A circuit is confirmed or installed. Heater voltage selector plug is set to match supply voltage. Bonding is completed using minimum 8 AWG solid copper conductor per Ontario Electrical Safety Code.
Step 7 – Commissioning & Testing The heater is started, all safety interlocks are verified, gas pressure is confirmed within 4–14" WC range, and water flow rates are checked against model minimums. Control panel is configured for pool/spa temperature set points and automation (IntelliCenter® RS-485 connection completed if applicable).
Step 8 – Homeowner Briefing Technician walks the homeowner through control panel operation, seasonal winterizing procedure, warranty activation, and who to call for service.
Warranty Coverage:
Warranty is void if:
Recommended Maintenance Schedule:
Toronto, Markham, Richmond Hill, Vaughan, Aurora, Newmarket, Scarborough, Brampton, and Mississauga.
Extended Service Area: Stouffville, Oshawa, Barrie, Orangeville, Hamilton, St. Catharines, Guelph, Kitchener.
The Max-E-Therm is designed for outdoor operation in Canadian climates with a minimum ambient temperature of -20°F (-29°C). For shoulder-season operation in spring and fall, the heater performs reliably. For winter use, the heater and all plumbing must be properly drained and winterized once ambient temperatures are expected to drop below freezing. Operating the heater to maintain pool temperature below 68°F (20°C) will cause condensation damage and void the warranty.
Yes. The Max-E-Therm features RS-485 connectivity for direct integration with the Pentair IntelliCenter® Control System. If you use a third-party automation system, 4Most Energy can assess compatibility during the site visit. Remote control via smart device is available when paired with IntelliCenter.
The standard copper exchanger offers 84% efficiency and is the right choice for most residential pools with properly maintained water chemistry. The HD cupro-nickel exchanger (82% efficiency) is more resistant to chemical attack and is recommended for saltwater pools, high-bather-load pools, or installations where water chemistry has historically been difficult to manage. The efficiency difference is minor; the durability advantage can be significant over the heater's service life.
At 333,000 BTU/hr with 84% efficiency, the effective heat output is approximately 280,000 BTU/hr. For a 20,000-gallon (75,700L) pool, expect a temperature rise of roughly 1.5°F per hour under average conditions. Actual performance depends on ambient temperature, wind exposure, whether the pool is covered at night, and current water temperature. 4Most Energy can provide a more precise heat-up estimate during the site assessment.
In most Ontario municipalities, a gas permit is required for any new gas appliance installation or replacement. 4Most Energy manages the permit process as part of the installation service, ensuring the installation is inspected and compliant with Ontario Building Code and CSA B149.1.
