Product Overview
The Sta-Rite Max-E-Therm 400 HD Natural Gas Heater SR400HD is a heavy-duty, high-performance pool and spa heater designed for fast heat-up, reliable operation, and long-lasting durability. With 400,000 BTUs of heating power, natural gas operation, and a cupro-nickel heat exchanger, this HD model is built for demanding residential pool and spa systems.
The Max-E-Therm series is known for its compact footprint, lightweight design, digital controls, and rustproof exterior housing. The SR400HD is a strong option for larger pools, attached spas, and customers who want quick temperature recovery with added heat exchanger protection.
Ideal For
Large residential swimming pools
Pool and spa combination systems
Natural gas pool heating applications
Customers wanting fast pool heat-up
Attached spas needing quick temperature recovery
Heavy-use pool and spa systems
Equipment pads with limited space
Customers wanting cupro-nickel heat exchanger durability
Key Features
400,000 BTU natural gas heating performance
Heavy-duty HD model
Cupro-nickel heat exchanger for added durability
120/240 VAC electrical capability
60 Hz operation
Digital temperature controls
Electronic ignition with no standing pilot
Low NOx heater design
Compact, lightweight Max-E-Therm cabinet
Rustproof Dura-Glas® exterior housing
Designed for fast pool and spa warm-up
Compatible with many pool and spa automation systems
Benefits
The Sta-Rite Max-E-Therm SR400HD delivers powerful 400K BTU heating while offering added durability through its cupro-nickel heat exchanger. This makes it a strong choice for heavier-use systems, tougher water conditions, and pool owners who want a more durable heater option than a standard copper exchanger model.
Its compact, lightweight design helps simplify installation and replacement on many existing equipment pads. Digital controls make temperature adjustment easy, while the natural gas platform provides fast and dependable heating for pools and spas.
Specifications
| Specification | Details |
|---|---|
| Brand | Sta-Rite / Pentair |
| Series | Max-E-Therm HD |
| Product Type | Pool and Spa Heater |
| Model | SR400HD |
| SKU | SR400HD |
| Barcode | 788379804084 |
| Fuel Type | Natural Gas |
| BTU Rating | 400,000 BTUs |
| Electrical Requirement | 120/240 VAC |
| Frequency | 60 Hz |
| Approx. Weight | 127 lbs |
| Heat Exchanger | Cupro-Nickel |
| Heater Type | Gas Pool & Spa Heater |
| Ignition Type | Electronic Ignition |
| Low NOx | Yes |
| Housing | Rustproof Dura-Glas® Composite Housing |
| Control Type | Digital Control Panel |
| Application | Residential pool and spa heating |
| Installation Type | Outdoor or properly vented indoor installation |
| Automation Compatible | Yes, with compatible pool automation systems |
| Installation | Professional installation recommended |
| Condition | New |
Compatibility & Ordering Notes
Confirm this is the correct natural gas HD model before ordering.
Verify that 400,000 BTUs is properly sized for the pool or spa application.
Confirm gas line sizing, gas supply, electrical requirements, plumbing layout, venting requirements, equipment pad clearances, and local code requirements before installation.
This model is not for propane systems. For propane applications, use the correct propane Max-E-Therm model.
Professional installation is strongly recommended.
Installed or used heaters may not be eligible for return.
Customer-Facing Q&A
Q: Is SR400HD natural gas or propane?
A: SR400HD is the natural gas version of the Sta-Rite Max-E-Therm 400 HD heater.
Q: How many BTUs is this heater?
A: This heater is rated at 400,000 BTUs.
Q: What makes the HD model different?
A: The HD model includes a cupro-nickel heat exchanger, which is designed for added durability in more demanding pool and spa applications.
Q: Can this heater run on 120V or 240V?
A: Yes. This model is designed for 120/240 VAC operation.
Q: What is the barcode for SR400HD?
A: The barcode is 788379804084.
Q: Does this heater use a standing pilot?
A: No. The Max-E-Therm uses electronic ignition and does not require a standing pilot light.
Q: Is this heater good for large pools?
A: Yes. The 400K BTU size is a strong fit for large residential pools, attached spas, and pool/spa combinations that need fast heat-up.
Q: Is professional installation recommended?
A: Yes. Gas pool heaters should be installed by a qualified professional to ensure proper gas, electrical, plumbing, venting, and safety setup.
Q: What should I verify before ordering?
A: Confirm fuel type, BTU sizing, gas supply, gas line sizing, electrical requirements, plumbing compatibility, venting requirements, installation clearances, and local code requirements.