Pentair MasterTemp 125 125K BTU Nat. Gas, no cord, 461058


Weight: 80.00 lbs
MPN: 461058

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Pentair MasterTemp 125 Natural Gas Pool Heater

Fast-heat-up, high-performance pool heater for up to 15,000 gallons

The MasterTemp 125 has been a top seller due to its low price with advanced operating features. Previously, such high-tech features were only available from more expensive, larger heaters. For example, the MasterTemp 125 uses remixed gas combustion technology, achieving 82% thermal efficiency, which is the highest of any heater in its category.

High-tech, User-friendly Control Panel

The digital display is convenient and simple to use. It provides more information and better control of all functions, at your fingertips.

Lightweight, and quick to install

The MasterTemp 125 Heater is compact and lightweight, which helps make it a quick installation by your pool professional. A faster installation means a lower cost installation.

Pentair MasterTemp 125 Natural Gas is Made in AmericaFeature Highlights

• 1.5" water connections are appropriate for above-ground and in-ground pools and spas up to 15,000 gallons.
• Premixed combustion technology for super-fast heat-up
• Available in natural gas (NG) or propane gas (LP)
• Use 3/4" gas supply pipe up to 50 ft. from source
• Input of 125,000 BTU is powerful enough for spas, above-ground pools and in-ground pools up to 15K gallons
• 120/240V electrical hookup for ignition and control panel operation. Available with or without a power cord and plug.
• Certified for low NOx emissions
• Advanced digital control panel is user-friendly and easy to see. Programming and monitoring is intuitive.
• Housing is corrosion-resistant and UV-resistant.
• Compact dimensions of 31.5" L x 21" W x 23" H
• Weighs just 80 lbs. Shipping weight is 100 lbs.
• Made in USA

Need the Air Intake Kit? Order part number 474845.
MasterTemp vent adapter for connecting to 4-inch stainless steel flue vent pipe.


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461059 461060
Fuel Natural Gas LPG Propane
Power cord No Yes No Yes
BTU/hr 125,000
Thermal Efficiency 82%
Low NOx Emissions Yes
Digital Thermostat Yes
Water Connections 1.5"
Gas Connection at Heater 0.75"
Installation Location Indoor or outdoor
Width (inches) 21"
Depth (inches) 31.5"
Height (inches) 23"
Certification CSA

Hayward H135IDP1 and H135ID1 are CSA Certified


Service and Installation Manual. Warranty terms are on page 5.
MasterTemp 125 Brochure

Frequently Asked Question ("FAQ")

Q: Should I buy and use a pool cover?
A: A pool loses heat from evaporative cooling. That's the cooling effect when water evaporates from the surface of the pool. It accounts for about 75% of a pool’s heat loss. And, a pool cover can reduce the heat lost from a pool by approximately 50%, and directly translates into a 50% reduction in your power consumption. That's a dramatic savings in your fuel bill.

In addition to lowering your energy bill, a pool cover will provide a valuable safety by preventing people from falling in accidentally, conserving chemicals, and reducing the load on filter systems by preventing debris from entering the pool.

Return Policy: At Pentair's option, defective product may be repaired on site or replaced with a new shipment. In case of freight damage, the buyer is responsible to file claim with the freight company.

Installation Help and Recommendations

We recommend that you have a professional pool heater installer review the above recommendations. Need an installer? Get 4 FREE Pool Heater Installation Estimates Now. It's Quick and Easy!
Contractors: Get Targeted Consumer Leads in Your Area Now.
Contractors: Apply for Wholesale Pricing from

Pentair® and Mastertemp are registered trademarks of Pentair, Inc. GadgetsGo is not associated with or sponsored by Pentair, Inc.

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