By Pentair Pool Products



Model # EC-462024

Warranty Ecommerce (EC) products: Products purchased from an Authorized Pentair Online Reseller (products beginning with EC-) receive a one (1) year (parts only) warranty from the date of purchase. The exceptions are: IntelliChlor cells and IntelliFlo SVRS pumps which receive a two (2) year warranty. EC products are not eligible for the bundled three (3) year extended warranty.

Alternate Part #'s EC462024, PENEC-462024, PUR-15-2008

Product Description


Introducing! The High-Efficiency, High Technology Heater for Bodies of Water up to 15,000 gallons  


The remarkably affordable new MasterTemp 125 heater gives you the energy savings 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 of any heater in its category. Its 1-1/2" plumbing is ideal for smaller applications, including aboveground pools, spas and inground pools up to 15,000 gallons. Featuring the first ever rotating, digital display offered in its class, the MasterTemp 125 heater provides valuable information conveniently and at the touch of a button. Plus, its lightweight, compact design makes the MasterTemp 125 heater easier to install than any other heater in its class - reducing labor costs which saves you money. 

MasterTemp 125 heater features include:

  • 82% energy efficiency is highest in its class.
  • 1-1/2” plumbing - ideal for smaller bodies of water up to 15,000 gallons.
  • High-performance, affordable heating with premium features.
  • Pre-mixed combustion technology for ultra-fast heat-up.
  • Easy-to-use, digitial display makes programming and monitoring a cinch.
  • 125,000 BTU rating.
  • Available in natural gas or propane gas.
  • 120/240 V electrical.
  • Lightweight - easy to handle and ship.
  • Certified for low NOx emissions.
  • Certified for Direct Air Intake with PVC Pipe.
  • Certified for outdoor and indoor vented installations.


These installations instructions are designed for use by qualified personnel only, trained especially for installation of this type of heating equipment and related components. Some states require installation and repair by licensed personnel. If this applies in your state, be sure your contractor bears the appropriate license. 


Product Specifications

125,000 BTU
0-9,000 ft.
Heat Exchanger:
Special Feature:
Standard Emission

?     Asked on 4/9/2015by David Stewart

This model is "without chord".....so what is the chord for? How do I know if I need one or not?

A  Answered on 4/9/2015 by InyoPools Product Specialist Robert M.

Hello David - Since this heater does not come with a cord it will need to be hard wired. Some models have a cord with a 3-prong plug. These models can be plugged into a standard 110v outlet.

?     Asked on 6/7/2016by Tommy

The house gas line is 1.25" and the heater has a 3/4" hook up. My question: Will this cause low gas pressure at the heater? Distance from main gas line to heater is less than 10'

A  Answered on 6/11/2016 by InyoPools Product Specialist Lennox H.

Hi Tommy, According to the MasterTemp High-Performance Heater Owners Manual 1/2" pipe is require so it can cause gas pressure issues.

?     Asked on 9/20/2016by Inyo Visitor

Hello, my pool is being built with 2 inch plumbing. Would I be able to use this heater? Thank you

A  Answered on 9/21/2016 by InyoPools Product Specialist Scott W.

That heater will work with the 2" plumbing, you would just need an adapter that goes from 2" to 1-1/2" since it's ports are 1-1/2". The Raypak 206k and the Hayward 150k have 2" ports.

?     Asked on 12/8/2018by Ryan

Does this unit need a pump? I had a propane chofu heater that was plumbed directly into my tub. Is that how this works, or do you need a pump?

A  Answered on 12/10/2018 by InyoPools Product Specialist Joe S.

Good afternoon, this unit will require a pump and filter system to allow the water to be pushed through the heater. 

?     Asked on 5/29/2021by Inyo Visitor

How much does it weight

A  Answered on 5/29/2021 by InyoPools Product Specialist Patrick P.

This heater weighs 100 lbs.


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