Pentair MasterTemp® 125 Heater with Cord 125K BTU Natural Gas
The Pentair MasterTemp® 125 Heater with Cord 125K BTU Natural Gas provides energy savings and advanced operating features that were only available from much larger heaters. With revolutionary pre-mixed gas combustion technology delivering 82% thermal efficiency — the highest in its class — and an advanced LCD display/controller for more information and better control.
Built by Pentair with a compact, lightweight design and 120V power cord included for straightforward installation. Suitable for above-ground pools, spas, and in-ground pools up to 15,000 gallons. Backed by a 1-year warranty.
⚠️ Professional Installation Required. Pool heater installation involves gas line connections. Always use a licensed contractor to ensure safety, code compliance, and warranty validity.
Key Features
125,000 BTU — 82% Efficiency
Highest efficiency in the 125K BTU class via pre-mixed gas combustion technology.
Advanced LCD Display/Controller
More information and better control than standard digital displays — easy to read and operate.
Pre-Mixed Gas Combustion
Revolutionary combustion technology for maximum efficiency in a compact heater.
Power Cord Included
120V cord included — plug-in electrical connection, no hardwiring required.
Compact, Lightweight Design
Easy to install — reduces labor costs and fits smaller equipment pads.
Indoor and Outdoor Rated
Suitable for both indoor and outdoor pool and spa installations.
Above-Ground and Small In-Ground Pools
Designed for above-ground pools, spas, and in-ground pools up to 15,000 gallons.
1-Year Warranty
Pentair parts warranty coverage.
Who It's For
- Above-ground pool owners wanting a compact NG heater with advanced LCD controls and cord
- Spa owners needing purpose-sized heating with plug-in connection
- In-ground pool owners with pools up to 15,000 gallons wanting LCD display control
- Installations where an LCD controller is preferred over a rotating digital display
Specifications
Heating Performance
| BTU Input | 125,000 BTU |
| Thermal Efficiency | 82% |
| Fuel Type | Natural Gas |
| Combustion Technology | Pre-Mixed Gas |
Construction
| Control Type | Advanced LCD Display/Controller |
Installation
| Electrical Connection | 120V Cord Included |
| Frequency | 60 Hz |
| Application | Indoor / Outdoor / Pool / Spa |
Physical
| Product Weight | 100 lb |
| Cabinet Dimensions | 21 W × 23 D × 21 H in |
| Shipping Dimensions | 36 × 22.5 × 25 in |
Approvals & Warranty
| Warranty | 1 Year Parts |
What's in the Box
- Pentair MasterTemp 125 Natural Gas Heater
- Power Cord
- Union Fittings
- User Manual
Warranty
The MasterTemp 125 with Cord NG (EC-462024) comes with a 1-year parts manufacturer warranty from Pentair. Clearflow Pool Supply is an authorized Pentair dealer and will assist with any warranty service needed.
Downloads
Frequently Asked Questions
How does this compare to the other MasterTemp 125K NG models (461058, 461059)?
All three are 125K BTU MasterTemp natural gas heaters with pre-mixed combustion and 82% efficiency. The EC-462024 features an advanced LCD display/controller and a 1-year warranty. The 461059 has a rotating digital display and 2-year warranty with cord. The 461058 has a rotating digital display and 2-year warranty with hardwire connection. Choose the EC-462024 for the LCD controller; choose 461058 or 461059 for the longer 2-year warranty.
Is this suitable for above-ground pools?
Yes. The MasterTemp 125 is specifically designed for above-ground pools, spas, and in-ground pools up to 15,000 gallons.
Does it require professional installation?
Yes. A licensed contractor should handle the natural gas line connection and proper venting. The power cord allows straightforward electrical connection without hardwiring, but the gas connection and venting must be done professionally.
What is pre-mixed gas combustion technology?
Pre-mixed combustion blends gas and air before ignition for a more complete, efficient burn — enabling the MasterTemp 125 to achieve 82% thermal efficiency, the highest in the 125K BTU class.