Product Overview
The Pentair MasterTemp 400 Natural Gas Heater 460736 is a high-output pool and spa heater designed for fast, reliable heating on larger residential pool systems. With 400,000 BTUs of heating power, natural gas operation, and 120/240 VAC electrical capability, this heater is one of the most popular choices for pool and spa combinations where quick heat-up and strong temperature recovery are important.
The MasterTemp 400 combines a compact equipment pad footprint with digital controls, low NOx performance, quiet operation, and a durable composite cabinet, making it a dependable upgrade or replacement heater for many residential pool systems.
Ideal For
Large residential swimming pools
Pool and spa combination systems
Natural gas pool heating applications
Customers wanting fast heat-up and quick spa recovery
Homeowners replacing an existing 400K BTU natural gas heater
Equipment pads with limited space
Residential systems needing maximum MasterTemp heating capacity
Key Features
400,000 BTU natural gas heating performance
120/240 VAC electrical capability
Compact MasterTemp cabinet design
Digital control panel for easy temperature adjustment
Rotating display for easier viewing and service access
Hot-surface ignition with no standing pilot
Low NOx certified heater design
Quiet operation for residential equipment pads
Rust-resistant composite exterior cabinet
Manual gas shutoff for service convenience
Designed for fast pool and spa warm-up
Compatible with many pool and spa automation systems
Benefits
The Pentair MasterTemp 400 gives pool owners powerful heating performance in a compact and efficient design. Its 400K BTU rating provides fast heat-up for larger pools and attached spas, making it a strong fit for customers who want quicker temperature recovery and dependable seasonal heating.
The digital control panel makes operation simple, while the low NOx design helps meet modern emissions requirements in many areas. The composite cabinet helps protect against outdoor conditions, and the compact design allows easier installation or replacement on many existing equipment pads.
Specifications
| Specification | Details |
|---|---|
| Brand | Pentair |
| Series | MasterTemp |
| Product Type | Pool and Spa Heater |
| Model | MasterTemp 400 |
| SKU | 460736 |
| Barcode | 788379724078 |
| Fuel Type | Natural Gas |
| BTU Rating | 400,000 BTUs |
| Electrical Requirement | 120/240 VAC |
| Phase | Single Phase |
| Frequency | 60 Hz |
| Heater Type | Gas Pool & Spa Heater |
| Ignition Type | Hot-Surface Ignition |
| Low NOx | Yes |
| Control Type | Digital Control Panel |
| Exterior | Rust-resistant composite cabinet |
| 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 model before ordering.
Verify that 400,000 BTUs is properly sized for the pool or spa application.
Confirm gas line size, 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 MasterTemp model.
Professional installation is strongly recommended.
Installed or used heaters may not be eligible for return.
Customer-Facing Q&A
Q: Is Pentair 460736 natural gas or propane?
A: Pentair 460736 is the natural gas version of the MasterTemp 400 heater.
Q: How many BTUs is this heater?
A: This heater is rated at 400,000 BTUs.
Q: Can this heater run on 120V or 240V?
A: Yes. This model is designed for 120/240 VAC single-phase operation.
Q: What is the barcode for Pentair 460736?
A: The barcode is 788379724078.
Q: Does this heater use a standing pilot light?
A: No. The MasterTemp 400 uses hot-surface ignition and does not require a standing pilot.
Q: Is this heater good for large pools?
A: Yes. The 400K BTU size is a strong fit for larger residential pools, attached spas, and pool/spa combinations that need fast heat-up. Proper sizing depends on pool volume, desired temperature rise, climate, and whether a pool cover is used.
Q: Can this heater connect to automation?
A: Yes. The MasterTemp platform can connect with compatible pool and spa automation systems.
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 line size, electrical requirements, plumbing compatibility, installation clearances, venting requirements, and local code requirements.