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Home Pentair MasterTemp 125 Low NOx Pool Heater - Electronic Ignition - Propane Gas without Cord - 125,000 BTU - 461060
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Pentair MasterTemp 125 Low NOx Pool Heater - Electronic Ignition - Propane Gas without Cord - 125,000 BTU - 461060

Pentair MasterTemp 125 Low NOx Pool Heater - Electronic Ignition - Propane Gas without Cord - 125,000 BTU - 461060 Pentair MasterTemp 125 Low NOx Pool Heater - Electronic Ignition - Propane Gas without Cord - 125,000 BTU - 461060

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Platinum Preferred Manufacturer
  • 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, Digital Display Makes Programming and Monitoring a Cinch.
  • Special order item - lead time is up to 3 weeks
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  • Pentair MasterTemp 125 Propane to Natural Gas Conversion Kit | 461062
    Pentair MasterTemp 125 Propane to Natural Gas Conversion Kit | 461062

MasterTemp® 125 High Performance Heater
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.
New Improved Rodent Resistance for the MasterTemp High Performance Heater
The engineers made improvements to reduce gaps and eliminate access points, including advancements to the heater base, all exterior side panels and louvers, the gas valve and water manifold openings, the exhaust opening and the exhaust cover. These subtle, but important, design changes add up to a better heater, from every angle.
In addition to the new rodent resistant improvements, the features and benefits of a MasterTemp High Performance Heater include:
  • Enhanced LCD display and diagnostics include easy to display and front-facing error messages and icons
  • Best-in-class energy efficiency
  • Eco-friendly certified for low, NOx emission and outperforms industry standard
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.

Brand: Pentair
BTU Rating
Gas Type
Q & A
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 24 questions Browse 24 questions and 30 answers
I have a 22ft. round pool. It is 4ft. deep. Will this heater handle it?
A shopper on May 12, 2016
what size propane tank is needed?
A shopper on Jun 5, 2017
Can this withstand corrosion, caused by less-than-optimal water chemical balance, any better than my Hayward heater?
Don B on Aug 8, 2016
On average, what does this generally cost to run per month for a larger in-ground pool?
Erica G on May 26, 2016
BEST ANSWER: We have a 24 ft round pool in Missouri. Have had this propane heater and been using for about two months. The heater uses about 1.25 gallons of propane per hour during heating. We have found that the heater raises the pool temperature about 1 degree per hour (or so). Obviously the operating cost will vary based on price of propane and the desired temperature of the water.
This heater is a great buy and is doing exactly what we want it to do so far.
does the Propane model come with the Propane hose or regulator?
jerry k on May 23, 2018
BEST ANSWER: the hose does not come with the heater and the regulator is supplied by the propane dealer.
whats the difference between heaters and heat pumps?
A shopper on Sep 18, 2019
BEST ANSWER: heaters use a fuel like propane or natural gas or even electric resistance elements to warm the pool water. heat pumps use a refrigeration cycle to take heat from the outside air and use it to warm the pool water.
Our elec. code requires a plug that "plugs and twist" to lock plug into outlet is that how the plug is ?
C T on Mar 24, 2018
BEST ANSWER: The model we bought does not come with a plug, it is designed to wire directly into a junction box, so I can't comment on the type of plug on the units with cord. I'm sure either Pool Supply Unlimited support or Pentair can answer this question.
What does that mean with out cord?
A shopper on Jun 29, 2017
BEST ANSWER: A corded unit can be plugged into an electrical outlet. If the unit is cordless, then it would be "hard wired" directly to an electrical source.
Can this be installed by homeowner ?
A shopper on Apr 3, 2016
BEST ANSWER: It can if you ate comfortable with using PVC and understand what gas fitting to use.
How do you set this up,?
Tracey S on May 29, 2019
BEST ANSWER: LIke any other heater, just plumb it after the filter, connect to gas line, and connect to low voltage wiring from your control panel. The manual has very clear instructions, or call any pool service company to install it for you.
i have an Inground 15k gallon pool would this work with that?
A shopper on May 29, 2017
BEST ANSWER: I have a 15000 gallon above ground and it works great. I have a propane model and it heats the water about 1 degree per hour and is very good with fuel consumption. Best purchase I have made for my pool.
I have a 6 x 4' wooden hot tub located outside in CT. Will this heater perform well with this size and pretty extreme winter environment?
A shopper on Oct 27, 2016
BEST ANSWER: I purchased this unit last spring and set it up on my 24 ft round above ground pool. It worked very nice with much lower operating costs that i had expected. Although I do not have the setup that you are asking about, I can not imagine that it would not work very well.
R13 code .will not fire,replaced all sensors ?
Michael on Sep 22, 2019
BEST ANSWER: R13 is not a code. That is the revision of the control board. That should appear once power has been applied to the heater as well as display a “126” then the display will go blank if its tied to automation, and display the water temp if the heater is a stand-alone. If it’s tied to automation, it is waiting for the “call for heat” command to happen. Once the “call for heat” command happens the heater will light up. If it does not then press the “Spa On” or “Pool On” to turn the heater on and adjust the temp up to 104^. If nothing turns on then the heater will need a service call for repair.
Can you just plug in 120 v and it works off electrical? OR Does it need to be plugged in and attach to gas line?
Tracey S on May 29, 2019
BEST ANSWER: It needs a gas line
Have a 21 foot pool. Looking for a propane heater. What do you suggest?
A shopper on Apr 21, 2019
BEST ANSWER: Working great
Does this device only come in Natural Gas or Propane.Does it come for electric hook up?
Rick B on Feb 7, 2017
BEST ANSWER: The Mastertemp 125 unit come in Propane or Natural gas. They also the option of being hard wired or coming with a 3' plug.
Is the MasterTemp 125 (propane) adequate for an aboveground pool with 15,000 to 17,000 gallons of water?
Can this unit be plugged in to a 110 or 220 electrical outlet?
Carl F on Jul 21, 2016
BEST ANSWER: I have this heater for an inground 18k pool and it is very good thus far!
what does without cord mean, .?
Doug B on Sep 1, 2020
I need to talk to someone tomorrow about purchasing a new pool heater?
Chris O on Apr 30, 2020
Will this work on
saltwater pool?
Gordon B on Jun 18, 2019
What size gas line should be used?
A shopper on Jun 11, 2019
What type of heat exchanger is in the Mastertemp 125 propane pool heater?
Laurie G on May 28, 2018
what is chord for and why no chord or chorded?
A shopper on May 29, 2017
I just installed the heater and I will not ignite. I tried numerous times to clear gas just in case there was air in line. I have a 24 ft round pool approx 13000 gallons. Any suggestions?
A shopper on May 28, 2017
4.9 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 4 out of 5
Good pool heater
So, pool guy suggested this model. It is quiet and heats very well. It appears to be bulletproof and heats the pool 5 degrees in an hour. <br>
March 6, 2017
Rated 5 out of 5
Little giant heater
This is a little giant heater, and does the job beautifully. Installation was as simple as can be, got everything up and running, now the temperature in my pool is just perfect...
September 2, 2015
Rated 5 out of 5
This unit replaced the original 400k heater. I live in Florida, so no need to heat pool, I only use it for spa part of pool so it is plenty big enough. My spa is about 55 gallons and it takes about 30 mins to go from 70 to 100 degrees. It is quiet and efficient. Pinch a penny removed the old one and installed new one for $175. It will not heat pool only spa. I am very satisfied.
P.S. I bought it 3 days before Black Friday and then they came out with free shipping, I called up PSU and they refunded my shipping of $110. Now thats great service!!
December 12, 2016
over 5 years ago
Rated 5 out of 5
love it it make a little sound but love it , thank you
April 14, 2018
over 4 years ago
Rated 5 out of 5
Effective and efficient heater
I am new to spas and pools but this unit seems to be well made and does the job.
May 23, 2018
over 4 years ago
Rated 5 out of 5
Self installed my new pool heater. ????
Works great ????. The toggle valve to the gas was slightly different than the instructions, but that was a very minor bump in the road to an easy installation by myself.

Pool Supply personnel were awesome all along the way. Highly recommend this heater. Yes it’s more noises than my old Mini-Max 75 but it’s certainly an upgrade.
November 10, 2019
over 2 years ago
Rated 5 out of 5
Just installed yesterday. Seems to fire up and heat as expected.
Unit was fairly simple to install and operates quietly.
I feel fairly assured that it will do the job.
July 4, 2020
1 year ago
Rated 5 out of 5
Perfect function but you need to empty of water to prevent freezing. We are in NC and heater is indoor but unheated lower level.
March 25, 2018
over 5 years ago
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Register your Pentair product online at www.pentair.com.

You've always been able to count on the quality and long service life of Pentair products. Pentair uses state of the art workmanship, materials and manufacturing processes to create the most innovative pool and spa equipment anywhere. And now Pentair products can deliver even more value and peace of mind, because Pentair offers extended warranty coverage on select products that are installed by a qualified installer*.
While the majority of Pentair products are covered by a sixty- (60) day warranty, a select number of products qualify for extended warranty coverage.
Select Bundled Products: applies to purchases and qualified installation of a minimum of a pump and filter, and one or more of the following: heaters, heat pumps, control systems, automatic cleaners, lighting, salt chlorine generators or UV sterilizer**
*Note: Qualified Installer - Defined as a licensed professional who charges a fee for his services, and possesses a business license, contractor's license and/or resale permit. Common examples of a "qualified installer" include: Swimming Pool, Home Repair or Landscape Professional; Plumber or Electrician; General Contractor; Heating and Air Conditioning Specialist.
**Note: Bundled products - must be purchased on the same invoice and installed at the same time. If any product within a bundle is ineligible for the bundled warranty coverage then all products within the same bundle will be disqualified from receiving the three (3) year extended warranty coverage for bundled products.
TradeGrade products must be purchased from a retail store (brick & mortar), pool builder or pool service company to receive a one-year, two-year or three-year warranty. If purchased online will only receive a sixty-day limited warranty. View the list of TradeGrade Products.
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.
Visit www.pentair.com to submit your product warranty registration.
This information was updated on 11/19/2021. For the most current information and full warranty policy please visit www.pentair.com/warranty.

 Adobe Acrobat PDF Warranty Information
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