Product Overview

The Pentair MasterTemp 125 High Performance Heater | EC-462024 is a compact natural gas pool and spa heater designed for efficient heating in smaller residential pool and spa systems. With 125,000 BTU heating capacity, this model is ideal for smaller inground pools, above-ground pools, spas, and pool/spa combinations that need dependable heat in a smaller heater footprint.

The MasterTemp 125 platform is built with advanced pre-mixed gas combustion technology, digital controls, electronic ignition, and a compact cabinet. It is designed for pools up to approximately 15,000 gallons, depending on climate, pool cover use, desired temperature rise, and installation conditions.

This natural gas model is commonly listed as EC-462024, with related Pentair references including 462024 and 461059, depending on channel and part listing.

Ideal For

• Smaller residential pools
• Above-ground pools
• Small inground pools
• Spas and hot tubs
• Pool and spa combination systems
• Natural gas pool heating systems
• Customers wanting compact heater sizing
• Replacing older small natural gas heaters
• Low NOx heater applications
• Equipment pads with limited space
• Professional pool heater installations

Key Features

• 125,000 BTU heating capacity — provides reliable heat for smaller pools and spas.
• Natural gas operation — designed for properties with compatible natural gas service.
• Compact MasterTemp 125 design — easier to position on smaller or tighter equipment pads.
• Designed for pools up to approximately 15,000 gallons — ideal for smaller residential applications.
• Pre-mixed gas combustion technology — supports fast and efficient heating performance.
• 82% thermal efficiency — efficient heater performance for its size class.
• Low NOx design — engineered for cleaner combustion and reduced emissions.
• Electronic ignition — reliable startup without a standing pilot light.
• Digital LCD display / controller — provides easy temperature control and operating feedback.
• Rotating digital display — improves visibility and service access during installation.
• 1-1/2" plumbing connections — suited for smaller pool and spa plumbing systems.
• Plug-in power cord reference — commonly listed with a 110V cord for simplified electrical connection where code-compliant.
• Corrosion and UV-resistant housing — designed for outdoor pool equipment environments.
• Quiet operation — supports a more comfortable poolside environment.

Benefits

The Pentair EC-462024 MasterTemp 125 Natural Gas Heater is designed to bring MasterTemp performance to smaller pools and spas. Its 125K BTU output provides dependable heating without oversizing the system, making it a practical choice for compact installations and smaller bodies of water.

The digital controller makes operation simple, while the rotating display improves service access. Its compact cabinet and 1-1/2" plumbing connections help simplify installation for smaller pool systems.

For pool professionals, the MasterTemp 125 offers a dependable natural gas heating option with efficient combustion, Low NOx performance, electronic ignition, and a service-friendly design.

Specifications

Included Components

• 1 × Pentair MasterTemp 125 natural gas pool and spa heater
• Integrated digital LCD controller
• Electronic ignition system
• Internal heat exchanger and combustion system
• Plug-in power cord, where supplied by manufacturer packaging
• Manufacturer-supplied installation documentation

Natural gas line, gas shutoff valve, regulator if required, electrical outlet, bonding materials, venting components, plumbing valves, unions, check valves, pressure relief valve if required by local code, equipment pad materials, and installation labor are sold separately unless specifically included by the supplier.

Compatibility Notes

This heater is designed for compatible natural gas pool and spa heating systems.

Common application references include:

• Smaller residential inground pools
• Above-ground pools
• Spas and hot tubs
• Pool/spa combination systems
• Natural gas equipment pads
• Replacing compatible 125K BTU natural gas heaters
• Systems requiring compact heater size and 1-1/2" plumbing

Always confirm fuel type, BTU requirement, gas line sizing, regulator requirements, electrical service, water flow, venting needs, elevation requirements, plumbing size, and local code requirements before ordering.

Installation Notes

This heater must be installed by a qualified pool professional, licensed gas technician, or licensed contractor as required by local code. Proper installation requires correct natural gas supply sizing, gas pressure verification, electrical connection, bonding, grounding, water flow verification, plumbing layout, combustion air, and venting where required.

Before installation, confirm that the fuel type is natural gas and that the gas supply can support a 125,000 BTU heater.

Water chemistry must be maintained within recommended ranges to protect the heater and preserve performance. Improper water balance, poor flow, incorrect gas pressure, or improper installation can damage the heater and may void warranty coverage.

Customer-Facing Q&A

Q: What is the Pentair EC-462024?
A: It is a Pentair MasterTemp 125 natural gas pool and spa heater rated at 125,000 BTU.

Q: What is the SKU?
A: The SKU is EC-462024.

Q: What is the UPC / GTIN?
A: The UPC / GTIN is 788379887308.

Q: What related part numbers are associated with this heater?
A: Related references include 462024 and 461059.

Q: What fuel type does this heater use?
A: This model uses natural gas.

Q: Is this a propane heater?
A: No. This is the natural gas model. Propane versions use different model numbers.

Q: How many BTUs is this heater?
A: This heater is rated at 125,000 BTU.

Q: What size pool is this heater designed for?
A: It is commonly recommended for pools up to approximately 15,000 gallons, depending on climate, desired temperature rise, and pool cover use.

Q: Is this heater Low NOx?
A: Yes. This model is commonly listed as a Low NOx heater.

Q: Does it have electronic ignition?
A: Yes. It uses electronic ignition / hot surface ignition and does not require a standing pilot light.

Q: Does it have digital controls?
A: Yes. It includes a digital LCD display / controller.

Q: What size plumbing does it use?
A: It commonly uses 1-1/2" plumbing connections.

Q: Is this heater compact?
A: Yes. The MasterTemp 125 is designed as a compact heater for smaller pools and spas.

Q: Should this heater be professionally installed?
A: Yes. Professional installation is strongly recommended because this heater requires proper gas, electrical, plumbing, venting, bonding, and safety setup.