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Pentair MasterTemp 125 High Performance Heater 125K BTU

SKU 461058
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The MasterTemp 125 Heater provides energy-saving and advanced operating features that were only available from much larger heaters. With its revolutionary pre-mixed gas combustion technology, the MasterTemp 125 Heater offers 82% thermal efficiency, the highest in its class. The advanced LCD/controller provides more information and better control.

  • Now, with smart connectivity and energy-saving automation, it’s easier than ever to get the pool warm and ready whenever needed.
  • New automation functionality and ignition control module with flame strength sensor for always optimized performance.
  • MasterTemp 125 Heater is certified for low NOx emission.
  • The multi-position top panel allows the digital display to be re-positioned for convenient operation.
  • A tough, rustproof exterior handles the heat and weathers the elements.
  • Certified for outdoor and indoor installations.
  • 1-1/2 in. Plumbing connection—ideal for smaller bodies of water, including aboveground pools, spas, and inground pools up to 15,000 gallons
  • Available in natural gas or propane gas
  • Lightweight: 80 lbs.—easy to handle and ship
  • 3/4 in. gas line up to 50 ft. from the source
  • Optional Smart Heater Bypass valve control diverts water flow when the heater isn’t needed to help save up to 35% in yearly operational costs.*

Support Documents: 


  • Natural Gas without Cord - 125 BTU (461058)
  • Natural Gas with Cord - 125 BTU (461059)
  • Propane without Cord - 125 BTU (461060)
  • Propane with Cord - 125 BTU (461061)

Accessories (*sold separately):

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Please Note: Pentair ‘TradeGrade Exclusive’ products require contacting us to purchase. Please use the request form above or Contact Us page; we can provide product details, availability, etc.

Disclaimer: Professional installation is required (*not included). Proof of installation by a professional technician is required to validate the factory warranty.

*Images are for representation.

Pentair Pool Warranty Support