By Pentair Pool Products



Model # EC-462025

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 461060, EC462025, PENEC-462025

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 4/13/2015by Inyo Visitor

Will this heater perform at 3000' elevation

A  Answered on 4/13/2015 by InyoPools Product Specialist Lennox H.

These unit are not elevation specific, so yes it will.

?     Asked on 6/2/2015by Catherine Pierfelice

Without the electrical cord?

A  Answered on 6/2/2015 by InyoPools Product Specialist Patrick P.

Hi Catherine, This heater is available with our without an electrical cord. If you get the model without an electrical cord then you would hardwire the heater to your electrical source. If you went with the MasterTemp Model With an Electrical Cord then it would plugin into a standard 120V outlet.

?     Asked on 6/17/2017by Diane

I'd like to get a Pentair Master Temp pool heater and want to know how long it normally takes to ship to El Cajon, CA?

A  Answered on 6/17/2017 by InyoPools Product Specialist Hector F.

On average, these units would take approximately 7 business days to be delivered to California, as long as in stock.

?     Asked on 5/5/2021by Ahmed yousuf

I have 20 ft long above ground pool, holds about 8,000 gallons. How long will it take to raise temperature , by hour? Also, in average will small tank of propane be enough to raise the temperature ?

A  Answered on 5/5/2021 by InyoPools Product Specialist Craig C.

Hello Ahmed.  In answer to your question, there are many variables to consider; ambient air temperature, wind speed, exposed water surface area, hours of sun/shade.  The simple answer is to use a basic formula.  Gallons of water multiplied by weight per gallon (8.33 lbs) multiplied by the degrees of desired change in temperature divided by the BTU output of the heater (125K BTU).  Your pool for example;  8,000 gallons X 8.33 X10 degree change / 125,000 = 5.33 hours.    Propane consumption basic formula;  there are 91,500 BTUs in 1 gallon of liquid propane,  Divide BTU output of the Heater, 125K BTU, by 91.5KBTU = gallons of propane used per hour.  Your heater for example; approx. 1.366 gallons/hour.  The capacity of the propane tank should be determined by referencing these calculations.

?     Asked on 5/12/2021by Dave

Does this heater have the appropriate heat exchanger type for a salt water application? And would a few 100 pound propane tanks linked together work to power it. I could not find specs on fuel input requirements.

A  Answered on 5/14/2021 by InyoPools Product Specialist Craig C.

Hello Dave.  The MasterTemp 125K  BTU  LP Gas Heater is compatible with saltwater pools.  Propane consumption is based on several factors. The Mastertemp 125K BTU LP Gas Heater burns 1.366 gallons of propane per hour.  How long the heater operates is based on the size of the body of water (in gallons) and the degrees of temperature increase desired.  Gas Consumption = gallons of water X weight of water (8.33 lb/gal) X degrees desired divided by heater BTUs.  Attached please find the Owners Manual for the MasterTemp 125K BTU LP heater.  Please note information on page 15.  Consult with your LP provider for more specific information.   MasterTemp High Performance Heater Owners Manual (8.96 MB) 


Review Summary

 (Average 5  out of 5 stars)
1 Ratings
5 star:
4 star:
3 star:
2 star:
1 star: