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Home Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 250000 BTU - EC-462026
NOTICE: The pool & spa industry continues to face industry-wide shortages on many products that most vendors expect to last late into 2022. We're allowing items to be purchased so that customers who choose to wait will have their order shipped when product is available. Most vendors are not providing any ETA on when items will be available. WE WILL EMAIL YOU RIGHT AWAY IF YOUR ITEM IS BACKORDERED. 

Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 250000 BTU - EC-462026

Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 250000 BTU - EC-462026 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 250000 BTU - EC-462026 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 250000 BTU - EC-462026

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  • Heats Up Fast so No Long Waits Before Enjoying your Pool or Spa while Achieving Best-In-Class Efficiency.
  • High Efficiency Rating Makes these Heaters Extremely Economical to Operate.
  • Rotating Digital Display Allows for Easy Viewing.
  • Tough, Rust Proof Exterior Handles the Heat and Weathers the Elements.
  • Improved Resistance to Rodent Intrusion
  • Online part number EC-462026 is the direct replacement for part number 460732
  • Pentair Sta-Rite 4x6 Metal Flue Collar for Indoor Vertical Venting - Negative Pressure for Distance Less Than 8' | 77707-0076
    Indoor Vertical Venting - Negative Pressure 4x6 Metal Flue Collar for Distances Less Than 8' | 77707-0076

  • Pentair Sta-Rite 4x8 Metal Flue Collar for Indoor Vertical Venting - Negative Pressure for Distances Over 8' | 77707-0077
    Indoor Vertical Venting - Negative Pressure 4x8 Metal Flue Collar for Distances Over 8' | 77707-0077

  • Pentair 4" Stainless Steel Appliance Adapter for Horizontal or Vertical Positive Pressure by Heatfab | 77707-0086
    4" Appliance Adapter Horizontal or Vertical Venting, Positive Pressure by Heatfab | 77707-0086

  • Pentair 4" Stainless Steel Appliance Adapter for Horizontal or Vertical Positive Pressure Venting by Z-Flex | 77707-0087
    4" Appliance Adapter for Horizontal or Vertical Positive Pressure Venting by Z-Flex | 77707-0087


Ultra-High Performance in a Compact, Quiet & Eco-Friendly Design

MasterTemp Heaters offer all the efficiency, convenience and reliability features you want in a pool heater, plus a lot more. As easy to use as your home heating system, plus, user-friendly indicator lights make system operation and monitoring a snap. The compact design and super-quiet operation won't intrude on your poolside leisure time. 
MasterTemps easy-to-read controls make system operation and monitoring simple. Pool and spa temperatures can be pre-set and controlled with the push of a button. A digital display indicates the water temperature, and five LED lights give you system status and let you know if the heater needs service.
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
No matter what you're seeking in your swimming pool heater, MasterTemp measures up. Compare this list of features to any other and you'll see why MasterTemp is setting a new standard for total value:
  • Very compact design for such a high performance heater allows for smaller overall equipment pads that won't intrude on your poolscape.
  • Easy to install or retrofit in even the tightest spaces.
  • A fully pre-mixed system with a highly efficient air and gas mixture lets MasterTemp heat up fast. No long waits before enjoying your pool or spa.
  • Compare energy efficiency ratings and you'll find MasterTemp at the top of the list. Comfort and economy can go together.
  • With a hot surface ignition (no pilot light) and pushbutton, digital controls, MasterTemp is as easy to operate as your home heating system. Plus, user-friendly indicator lights make system operation and monitoring a snap.
  • The easy-to-view, rotating digital display places controls front and center, no matter how MasterTemp is positioned on your equipment pad.
  • MasterTemp is engineered for super-quiet operation and won't intrude on your poolside leisure time.
  • A tough, composite exterior handles the heat and weathers the elements.
  • Safe operation is assured through a series of features, including; a water pressure switch that senses the pump is running to prevent overheating; high limit switches assure the heater turns off if water temperature exceeds factory set limits; manual gas shut-off when service is required; stack flue sensor also guards against overheating.
  • Approved for installation on combustible surfaces.
Why MasterTemp Heaters are the "Greenest" Choice
An Eco Select Brand: MasterTemp Heaters offer best-in-class energy efficiency. Plus, they are certified for low NOx emissions, making them eco-friendly favorites. In fact, MasterTemp outperforms current industry standards for air pollution exhaust.
The Eco Select Brand identifies Pentair's "greenest" and most efficient equipment choices. These products save energy, conserve water, eliminate noise or otherwise contribute to a more environmentally responsible equipment system.
As the global leader in pool and spa equipment manufacturing, Pentair strives to provide greener choices.
Brand Pentair
Sub Brand MasterTemp
Item Low NOx Pool and Spa Heater
Type High Performance
Gas Type Natural Gas
Control Type Digital
BTUH Input 250,000
Cabinet Width 23.02"
Cabinet Depth 32.61"
Cabinet Height 28.15"
Gas Connection 3/4"
Water Connection 2"
Voltage Rating 120/240 VAC
Frequency Rating 60 Hz
Phase 1-Phase
Flow Rate 120 gpm

Brand: Pentair
BTU Rating
Gas Type
Natural Gas
Q & A
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 40 questions Browse 40 questions and 51 answers
Is it cheaper to heat a pool with gas or propane?
A shopper on Mar 23, 2019
What size gas pipe does the 25k and the 30k take to hook up to these Pentair Units?
Jeff K on Feb 10, 2018
Hi is 250000 btu enough for 18000 gallon Poo and spa combo ?
David on Oct 5, 2018
BEST ANSWER: The general rule is about 1 degree per hour to heat the pool and this will do just over that. So the answer is yes, this is good enough for your pool.
Which side does the gas line connect to?
Randall K on Mar 28, 2016
BEST ANSWER: The gas connection as you look at the photo of the unit is in the rear left. You will however need to do some plumbing to add a sediment trap and provide for the connection to the gas regulator. Instructions are in the installation manual.
how do you replace the fuse?
A shopper on Jul 11, 2016
BEST ANSWER: Remove the front cover panel and in the electrical box there is a 1/4 amp fuse that's clipped in that you can replace easily. Best to get the fuse and match it. You may have to go to an electrical supply or industrial hardware store.
what kind of piping is recomended PVC or CPVC?
Anthony M on Feb 19, 2021
How long to heat up pool with pentair 250?
A shopper on Aug 1, 2018
BEST ANSWER: I have a 15k gallon pool with 3 of 4 working jets. Pool goes up about 5 degrees in one hour.
Will this product heat a 20000 gallon pool and how long will it take?
Jason C on Feb 4, 2019
BEST ANSWER: My Pool is about 11,000 gallons. From my experience using this unit for the past 8 years, I generally estimate this unit increases the water temperature roughly 2 degrees per hour. (southern California, not used in the winter).
I am looking to replace an old Pentair natural gas heater with this one. Do I need to make any changes to the gas hookup other than adjusting for the location on the new heater?
samucco on Jul 16, 2018
BEST ANSWER: no, my electrician didn't need to change it
Is there a filter that needs cleaned?
A shopper on May 22, 2021
BEST ANSWER: there is no filter in heater.
How difficult is it to connect to pool equipment?
Steve T on Feb 5, 2021
BEST ANSWER: Connecting the heater wasn’t that difficult. This unit has electronic ignition so having electricity close by helps. Instructions are straight forward and easy to understand. I did use a local Pentair distributor to make plumbing connections for warranty purposes.
will this work with a salt system?
A shopper on Sep 27, 2019
BEST ANSWER: Yes it will. The Pentair HD models are recommended for salt water but it's not an absolute requirement. In our opinion its worth the extra money for the HD model. That part number would be 460806. The difference is a cupro nickel heat exchanger rather than the copper heat exchanger that this heater comes with.
25000 gal., what size heater?
A shopper on Sep 28, 2018
BEST ANSWER: It would depend on what part of the country you live. I live on the gulf coast and installed my heater in the spring. I have not yet had to use it. I anticipate using it sometime in mid November. I bought a less efficient model in a much lower price. I will only use it on a limited basis in November, February and March. I suggestion is to look at a chart that you can find online that will give you an estimate of what you will need based on Pool size and the part of the country do you live
what are the electrical requirements? Is it a 110 plug in?
A shopper on Nov 17, 2017
BEST ANSWER: This heater is prewired to connect to a 220v hardwire but it may be changed to 110v by the installer.
I have a 3500 to 4000 gal. spa pool. To reach 80 degrees how many hours. Is this the correct unit for natural gas ? .
greg p on Dec 30, 2016
BEST ANSWER: Yes this is a natural gas unit also I have a 24000 gallon pool depending on outside conditions it took about 2 days to heat to 74 dry obviously exterior temps and original water temp affect how long it will take . This unit might be a little much for that size pool I would check with the salesperson to see if a smaller unit would suffice I think they have 3 different sizes (btu) of this unit
What size pool will this heat?
A shopper on Jun 19, 2016
BEST ANSWER: I have a 22,000 gallon pool and it heats just fine. Take in to consideration your gas line size and the distance its ran. Most people get sold on a 400k btu heater because they believe it will heat faster but they dont even have the supply to feed such a heater. In March I had this heat my pool from ~60 degrees to ~ 80 degrees F in just a day. Works fine so far, havent turned it on in months since I have a pool cover, you shouldnt even think of getting a heater without one.
Can you connect with with service companies in the Nashville Tn area that can install this type of unit?
Ray Harness on Jun 2, 2016
BEST ANSWER: I live in the Pittsburgh, PA area and had a plumber install the heater.
Is there an option for the display to be on the opposite side of this model? Need inlet/outlet to be on the left side of unit
Sean K on Apr 18, 2016
BEST ANSWER: Its been a while since I installed mine, but you can rotate the top panel with the controls as needed. Check out the installation pdf, they have details. bye the way , it works well. Im happy with my heater.
propane fuel?
A shopper on Feb 3, 2016
BEST ANSWER: No. It needs to be hooked up to your gas line.
Does this unit have separate controls for the pool and spa?
Christine M on Jun 24, 2020
BEST ANSWER: Yes it does
Does it run on 110 or 220 volts?
A shopper on May 5, 2019
BEST ANSWER: Yes it can run on either 110 or 220 but there is a jumper plug to be used in the circuit board depending on which one you choose. So read the manual for accurate description
Can this model be converted to use LPG?
A shopper on Feb 8, 2019
BEST ANSWER: You will need the attached item to convert natural gas to propane.
Pentair MasterTemp Gas Conversion Kit | Natural Gas to Propane 250K BTU | New Style | 460741
Pentair MasterTemp Gas Conversion Kit | Natural Gas to Propane 250K BTU | New Style | 460741
do you have a local installer to recommend to us in central Florida area? if you have, how much you charge for installation (include from front yard to back side of pool)?
A shopper on Nov 3, 2018
BEST ANSWER: I just received your inquiry today Jan 19, 2019.....I don't have any recommendations for central FL providers. All you need is a plumber to run the PVC and an Electrician to run the power. Here in the panhandle of FL, the electrical ran aprx. $300 and the plumbing $200. It comes down to how many feet of PVC needed. Hope this was in time to help.
How long to heat a 2000 gallon spa?
A shopper on Oct 24, 2018
BEST ANSWER: my spa is approx. 1200 gallons and it goes from 70 to 98 in about 20 to 30 minutes.
Do I need anything special for 4100 ft above sea level?
Shannan W on Jul 27, 2016
BEST ANSWER: No. This heater is already rated for up to 9000 ft
does this heater have cupro-nickel heat exchangers?
King S on Nov 28, 2015
BEST ANSWER: This heater does not have a Cupro Nickel heat exchanger. You're looking for the 460806. Please give us a call if you have any further questions
What size of propane heater would we need for 15000 gallon above ground pool in the Pacific northwest and what brand ? yes
Steve D on May 30, 2021
Our pool holds between 15k and 17k gallons. What BTU do we need for a heater?
A shopper on Aug 17, 2019
what is the difference between the regular and low nox models?
A shopper on Jul 3, 2019
5.0 / 5.0
7 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
I only needed 200,000 btu to warm up my pool. This company recommended I raise my btus and explained why. Since doing so my pool heats up quicker and my gas bill has cut in half. Thank you pool supply unlimited!
January 6, 2014
Rated 5 out of 5
Tossed around between some heaters and most recommended was these Pentair.It does a good job heating our spa quickly and have only heated the pool twice.Great and easy to use.
February 2, 2016
Rated 5 out of 5
Although I’ve only had it for a couple of weeks, it seems like a powerful and efficient unit. I’ve “T’d” off my gas meter and ran a 1” gas line @ 75’. My pool is 17,000 gal, with no Jacuzzi. It takes about 30-35 min per degree, but once it settles above 78 degrees, it heats much quicker (2hrs to get from 79-83) I live in Sothern California so I’m reviewing at “California Weather”. I haven’t seen the new gas bill, so will have to return with an update.
April 14, 2018
over 4 years ago
Rated 5 out of 5
Got 250,000 btu for about 2 months, very happy with its performance, heat up my spa pretty quickly. The unit is compact and well built
August 4, 2019
over 2 years ago
Rated 5 out of 5
Pentair 250 Natural Gas
Communication with company and online inquiry and ordering went just fine. Received unit as expected and it works great!
July 25, 2020
1 year ago
Rated 5 out of 5
Excellent transaction
Great customer service when ordering. Speedy delivery from Florida to upstate New York. Saved about $400 compared to local source who estimated delivery in 2-3 weeks vs 6 days actual from Pool Supply
September 19, 2020
1 year ago
Rated 5 out of 5
I have only used it once but it’s working great so far
November 22, 2020
1 year 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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