Product Overview

The Pentair MasterTemp ASME 400 Heater Propane Gas, 400K BTU | 460776 is a commercial-grade propane pool and spa heater designed for fast, reliable heating in demanding residential, semi-commercial, and commercial pool applications.

Built with an ASME-certified heat exchanger, this heater is designed for applications where ASME construction is required or preferred. With 400,000 BTU of heating power, the MasterTemp ASME 400 delivers quick heat-up performance for larger pools, attached spas, and high-use systems.

This propane model is a strong choice for properties that do not have natural gas available and need dependable high-output pool heating.

Ideal For

Commercial pools, hotel pools, apartment and HOA pools, large residential pools, pool/spa combinations, and applications where an ASME-rated propane heater is required. This model is best suited for professional installations where fast heat-up, propane fuel compatibility, and ASME construction are important.

Key Features

400,000 BTU Heating Power

Provides high-output heating performance for large pools, spas, and commercial-style pool systems.

ASME-Certified Heater Design

Built with an ASME heat exchanger for applications that require commercial-grade heater construction.

Propane Gas Model

Designed for propane gas installations where natural gas is not available or not preferred.

Fast Heat-Up Performance

The 400K BTU output helps heat pools and spas quickly, making it ideal for pool/spa combinations and high-demand heating applications.

Digital Control Panel

User-friendly digital controls make it easier to monitor heater status, adjust temperature, and operate the unit.

Compact MasterTemp Design

The MasterTemp platform is known for its compact footprint, making it easier to fit into many equipment pad layouts compared with larger commercial heater bodies.

Low NOx Operation

Designed for efficient combustion and reduced emissions compared with older heater designs.

Professional Pool and Spa Heating

A strong choice for demanding heating applications where durability, output, and code compliance matter.

Benefits

The Pentair MasterTemp ASME 400 Propane Heater gives pool owners and commercial operators powerful heating performance in a compact, professional-grade package. Its 400K BTU output helps reduce heat-up time, while the ASME-certified design supports use in applications where commercial heater standards are required.

For properties using propane fuel, this model provides a dependable alternative to natural gas heating. It is especially useful for larger pools, spas, hotels, apartment communities, HOA pools, and backyard systems where quick heat recovery is important.

Specifications

Customer-Facing Q&A

Q: What is the part number for this heater?
A: The part number is 460776.

Q: Is this heater natural gas or propane?
A: This model is propane gas. It is not the natural gas version.

Q: How many BTUs is the Pentair 460776?
A: This heater is rated at 400,000 BTU.

Q: What does ASME mean on this heater?
A: ASME refers to a commercial-grade heat exchanger construction standard. ASME heaters are often required for commercial pools, public pools, HOA pools, hotel pools, and certain code-regulated applications.

Q: Can this heater be used on a residential pool?
A: Yes, it can be used on residential pool and spa systems when properly sized and installed. It is also commonly used in semi-commercial and commercial applications.

Q: Is this good for an attached spa?
A: Yes. A 400K BTU heater is a strong option for pool/spa combinations because it can heat spa water quickly when the system is properly installed.

Q: Can I convert this propane heater to natural gas?
A: Fuel conversions should only be performed if the correct manufacturer-approved conversion kit is available and installed by a qualified professional. Always confirm conversion compatibility before attempting any fuel change.

Q: Does this heater require professional installation?
A: Yes. Gas heaters require proper gas sizing, electrical wiring, bonding, plumbing, ventilation clearance, and code compliance. Installation should be completed by a qualified pool professional or licensed contractor.

Q: What should I confirm before ordering?
A: Confirm fuel type, BTU size, ASME requirement, gas line sizing, plumbing layout, installation clearance, local code requirements, and whether propane is the correct fuel source for the property.