Product Overview
The Pentair MasterTemp ASME 400 Natural Gas Heater 460775 is a high-performance, ASME-certified pool and spa heater designed for demanding residential, semi-commercial, and commercial-style applications. With 400,000 BTUs of heating power, natural gas operation, and compact MasterTemp engineering, this heater delivers fast heat-up, dependable temperature recovery, and reliable performance for larger pools and spas.
The ASME version is built for applications where ASME-rated construction is required or preferred, making it a strong choice for apartments, condos, hotels, motels, community pools, high-end residential pools, and other heavier-use pool environments.
Ideal For
Large residential swimming pools
Pool and spa combination systems
Commercial-style pool and spa applications
Apartments, condos, hotels, motels, schools, parks, and community pools
Natural gas pool heating systems
Customers needing an ASME-certified heater
Replacing an existing 400K BTU ASME natural gas heater
Applications requiring fast heat-up and strong temperature recovery
Key Features
400,000 BTU natural gas heating performance
ASME-certified heater construction
Built for demanding residential and commercial-style pool applications
Compact MasterTemp cabinet design
Digital control panel for easy temperature adjustment
Rotating digital display for easier viewing and service access
Hot-surface / electronic ignition with no standing pilot
Low NOx certified heater design
Quiet operation for equipment pad installations
Manual gas shutoff for service convenience
Rust-resistant exterior cabinet
Designed for fast pool and spa warm-up
Compatible with many pool and spa automation systems
Benefits
The Pentair MasterTemp ASME 400 gives pool owners and commercial property operators powerful heating performance with ASME-rated construction. Its 400K BTU output provides fast pool heat-up and quick spa recovery, while the compact MasterTemp design helps save equipment pad space compared to many older heater designs.
The ASME configuration is ideal when local code, commercial use, property requirements, or project specifications call for an ASME-rated heater. Digital controls and diagnostic indicators help simplify operation and service, while the low NOx design helps meet modern emissions standards in many areas.
Specifications
| Specification | Details |
|---|---|
| Brand | Pentair |
| Series | MasterTemp ASME |
| Product Type | Pool and Spa Heater |
| Model | MasterTemp ASME 400 |
| SKU | 460775 |
| Barcode | 788379747558 |
| Fuel Type | Natural Gas |
| BTU Rating | 400,000 BTUs |
| Certification | ASME Certified |
| Heater Type | Gas Pool & Spa Heater |
| Electrical Requirement | 120/240 VAC |
| Phase | Single Phase |
| Frequency | 60 Hz |
| Low NOx | Yes |
| Control Type | Digital Control Panel |
| Ignition Type | Hot-Surface / Electronic Ignition |
| Exterior | Rust-resistant cabinet |
| Application | Residential, semi-commercial, and commercial-style pool/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 ASME model before ordering.
Verify that 400,000 BTUs is properly sized for the pool or spa application.
Confirm whether ASME certification is required by local code, project specifications, commercial property requirements, or health department requirements.
Confirm gas line size, gas supply, electrical requirements, plumbing layout, venting requirements, equipment pad clearances, and local installation codes before installation.
This model is not for propane systems. For propane applications, use the correct propane ASME MasterTemp model.
Professional installation is strongly recommended.
Installed or used heaters may not be eligible for return.
Customer-Facing Q&A
Q: Is Pentair 460775 natural gas or propane?
A: Pentair 460775 is the natural gas version of the MasterTemp ASME 400 heater.
Q: How many BTUs is this heater?
A: This heater is rated at 400,000 BTUs.
Q: What does ASME mean on this heater?
A: ASME refers to a certified construction standard often required for commercial or higher-demand pool applications. It may be required by code, project specifications, or property requirements.
Q: Is this heater good for commercial pools?
A: Yes. The ASME version is commonly used for commercial-style applications such as apartments, condos, hotels, motels, schools, parks, community pools, and high-end private pools.
Q: What is the barcode for Pentair 460775?
A: The barcode is 788379747558.
Q: Can this heater run on 120V or 240V?
A: Yes. MasterTemp heaters are designed for 120/240 VAC single-phase operation.
Q: Does this heater use a standing pilot light?
A: No. This heater uses hot-surface / electronic ignition and does not require a standing pilot.
Q: Is this the same as the standard MasterTemp 400 heater?
A: No. This is the ASME-certified version, intended for applications where ASME construction is required or preferred.
Q: Is professional installation recommended?
A: Yes. Gas pool heaters should be installed by a qualified professional to ensure proper gas, electrical, plumbing, venting, safety, and code compliance.
Q: What should I verify before ordering?
A: Confirm fuel type, BTU sizing, ASME requirement, gas supply, gas line sizing, electrical requirements, plumbing compatibility, venting requirements, installation clearances, and local code requirements.