Pentair MasterTemp® Liquid Propane High Performance Heater with Cord 125K BTU
The Pentair MasterTemp® Liquid Propane High Performance Heater with Cord 125K BTU brings the energy savings and advanced operating features of larger heaters to a remarkably affordable, compact package. With revolutionary pre-mixed gas combustion technology, the MasterTemp 125 delivers 82% thermal efficiency — the highest of any heater in its category.
Its 1-1/2 inch plumbing is ideal for smaller applications including above-ground pools, spas, and in-ground pools up to 15,000 gallons. The first-ever rotating digital display offered in its class, lightweight compact design, and cord included make it easier to install than any other heater in its class. Liquid propane version for locations without natural gas access. Backed by a 2-year warranty.
⚠️ Professional Installation Required. Pool heater installation involves propane gas line connections. Always use a licensed contractor to ensure safety, code compliance, and warranty validity.
Key Features
125,000 BTU Liquid Propane
Highest efficiency in its category — for above-ground pools, spas, and in-ground pools up to 15,000 gallons without natural gas.
82% Thermal Efficiency
Pre-mixed gas combustion technology — highest thermal efficiency in the 125K BTU class.
1-1/2 Inch Plumbing
Sized for above-ground pool systems, spas, and smaller in-ground installations.
Rotating Digital Display
First-ever rotating digital display in its class — operating info at the touch of a button.
Lightweight, Compact Design
Easier to install than any other heater in its class — reduces labor costs.
Cord Included
120V power cord included for straightforward electrical connection.
Energy Efficient
Green certified — energy savings previously only available from much larger heaters.
2-Year Warranty
Pentair residential warranty coverage.
Who It's For
- Above-ground pool owners wanting a compact, efficient liquid propane heater
- Spa owners needing purpose-sized propane heating
- In-ground pool owners with pools up to 15,000 gallons without natural gas access
- Anyone who wants the easiest-to-install heater in the 125K BTU LP class
Specifications
Heating Performance
| BTU Input | 125,000 BTU |
| Thermal Efficiency | 82% |
| Fuel Type | Liquid Propane |
| Combustion Technology | Pre-Mixed Gas |
| Max Flow Rate | 70 GPM |
| Pool Size | Up to 15,000 gallons (in-ground); above-ground pools and spas |
Construction
| Control Type | Digital (Rotating Display) |
| Plumbing Size | 1-1/2 in |
Installation
| Gas Connection | 0.75 in |
| Voltage | 120V / 240V |
| Amperage | 15A |
| Frequency | 60 Hz |
| Phase | Single |
| Application | Indoor / Outdoor / Pool / Spa |
| Cord Included | Yes |
Physical
| Product Weight | 100 lb |
| Cabinet Dimensions | 21 W × 23 D × 21 H in |
| Shipping Dimensions | 23 × 36 × 25 in |
Approvals & Warranty
| Energy Efficient | Yes (Green Certified) |
| Warranty | 2 Years |
What's in the Box
- Pentair MasterTemp 125K BTU Liquid Propane Heater
- Power Cord
- Union Fittings
- User Manual
Warranty
The MasterTemp 125K BTU LP with Cord comes with a 2-year manufacturer warranty from Pentair. Clearflow Pool Supply is an authorized Pentair dealer and will assist with any warranty service needed.
Downloads
Frequently Asked Questions
What is the difference between this and the natural gas 125K model (461059)?
The 461061 runs on liquid propane and the 461059 runs on natural gas. All performance specifications — BTU output, thermal efficiency, plumbing size, display, and warranty — are identical. Choose the LP model if you don't have natural gas service at your property.
Is it suitable for above-ground pools?
Yes. The MasterTemp 125 LP is specifically designed for above-ground pools, spas, and in-ground pools up to 15,000 gallons. Its 1-1/2 inch plumbing matches the smaller diameter plumbing common in above-ground pool systems.
Does it require professional installation?
Yes. A licensed contractor should handle the propane gas line connection and proper venting. The 120V 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 propane and air before ignition, resulting in a more complete, efficient burn than traditional diffusion combustion. This is what enables the MasterTemp 125 LP to achieve 82% thermal efficiency — the highest in the 125K BTU propane class.