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Home Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | EC-462028
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 - 400000 BTU | EC-462028

Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | EC-462028 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | EC-462028 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | EC-462028

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Energy EfficientEnergy Efficient
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Platinum Preferred Manufacturer
  • 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-462028 is the direct replacement for part number 460736
  • 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 400,000
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 43 questions Browse 43 questions and 29 answers
My in ground pool measures 18x32. It is 4 ft. deep at the shallow end and 9' at the deep end. I'm told it holds 35k gallons. What size heater do I need to heat my pool?
A shopper on Mar 6, 2017
BEST ANSWER: Any brand 400k BTU or up, according to your budget, But you have to consider wind more than 5 mph could keep the temperature down, distance from equipment to pool can cool down the water, and the temperature of the water when begin to heat up and the air. Those factors affect the time and efficiency to heat up your pool.
Will this heater work with a Jandy R6 control center?
A shopper on Aug 20, 2016
I have had a master temp 200 heater for 4 years. Something goes wrong with it every year... I think it is a lemon! it costs me 80.00 every year to have the pool guy come and fix it. Has anyone else had the problem..Mine keeps giving me r=8 and I can't turn the heater up past 40 degrees. Now what?
Polly F on Apr 1, 2016
BEST ANSWER: I have had mine for three years and no problem so far. You have be knocking on wood.
What diameter gas line is needed if gas source is 130 ft. Away?
Donald B on Jun 1, 2019
If I'm buying the Pentiar MasterTemp 400K BTU heater along with the Pentair VS Pump 011018, how long is the warranty for parts & labor? Does the warranty begins with my purchase date or does it go back to the manufacturing date based on the serial number?
Angela L on Sep 10, 2015
BEST ANSWER: If you were to purchase the heater and the 011018 VS pump, the warranty would 3 years on the pump and 2 years on the heater. A 3rd big ticket item would have to be purchased in order to get the 3 year bundle warranty. So either a filter, light, etc. All warrantys are done through the manufacturer (in this case pentair) and begin from the date of purchase provided a licensed professional installed it.
do you need high temp exhuast pipe for this unit ?
matt f on Mar 3, 2016
BEST ANSWER: We did not have to add any additional exhaust pipe. We made sure there was no obstructions like low hanging roof but it runs pretty cool and heat dissipates very well. We are very please with this heater.
Cannot turn off heater?
John F on May 23, 2021
BEST ANSWER: The "Heater Off" touch button is on the far right side of the heater controller. If you gentle push on the button the heater will cease operation. If that doesn't work, unplug the heater for 10 minutes - this accomplishes a "hard" reset. Plug heater back into receptacle and push off button again
Is this pool heater for commercial use also?
Matthew Y on Jul 29, 2020
BEST ANSWER: I bought this heater for my pool and hot tub. I use my hot tub twice a day everyday of the year for my kayak workouts. Many people swim in my pool each week and I often heat my pool in the winter for gatherings. It has been perfect for us. Bobby from Texas
Is the Pentair Model 460736 rated at 400000 BTU Pool and Spa Heater compatible with salt water use?
A shopper on May 6, 2020
BEST ANSWER: Yes. I’ve had it on my saltwater pool for 5 years with no issue
Can this heater work with propane?
Larry S on Mar 12, 2017
BEST ANSWER: it comes in natural gas or propane models....just make sure you order the propane model....btw...its the best heater ive ever owned [ive owned 5 heaters over 30 years]..small form factor....that works differently than the old fashioned heaters
does this unit come with remote wifi?
A shopper on Jul 2, 2021
BEST ANSWER: No. But can be added
Can I wire this into my Jandy Aqualink RS?
A shopper on Apr 30, 2021
Would this heater work with salt water pool?
A shopper on Feb 1, 2021
BEST ANSWER: It works fine with my salt water pool. No problems
What is the thermal efficiency of this product model 460736?
Joann R on May 13, 2020
What is the warranty on this product?
shivbir g on Jan 18, 2020
BEST ANSWER: Not sure of the warranty but I installed mine about 4 years ago and haven’t had a single issue with it.
Can the heat exchanger be replaced?
A shopper on May 18, 2019
BEST ANSWER: yes but is expensive get the new heater
Do you do installation?
A shopper on Sep 23, 2018
BEST ANSWER: Unfortunately, we do not. We do have a company that is in some areas in the US you may want to check.

how long it takes to heat 10x28 6' deep with pentair 400k heater ?
Manuk A on Sep 10, 2018
BEST ANSWER: depend the air temperature but you have to know how many gallons your pool is all i can tell you the 400BTU heat up the 500 gallon spa in 30-40 min .
What is the difference between the 460736 and 460805?
Lane P on May 6, 2018
BEST ANSWER: The pentair 460805 has a copper-nickel alloy heat exchanger, which is more corrosion resistant than the copper heat exchanger found on the 460736. Since we are operating in a high heat, salt or chlorine water environment, it should last longer before corrosion failure.
how much propane does it burn in an hour?
A shopper on May 11, 2017
what sixe piping outlet?
A shopper on Dec 28, 2016
BEST ANSWER: 2" inlet and outlet
Can this pool heater be changed from natural gas to propane?
Carroll H on Mar 25, 2016
BEST ANSWER: Yes it can. We have conversion kits on our site for the Mastertemp that run around $40.00
How do I know what pentair gas heater works with my current pentair control pads?
Sheri H on Sep 21, 2015
BEST ANSWER: This heater will work with all current Pentair controls.
Is this unit in stock?
A shopper on Jul 22, 2021
Do you have this in stock?
Chad W on Jul 13, 2021
Do you have this heater in stock?
Allan P on Jun 7, 2021
can I get this for Propane?
Maria B on Jun 6, 2021
Do you have the Heater in stock?
Philip R on May 24, 2021
Do you have this heater in stock? Pentair Mastertemp 400K BTU Natural Gas
Paul G on Apr 30, 2021
Can this unit be converted to LP without any loss of performance?
A shopper on Apr 14, 2021
4.6 / 5.0
19 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Warm Water
Had a Pentair unit for 14yrs and it worked great without issues.I chose this again and hope it was last as long as the other.Good warranty too compared to the others.
April 1, 2015
Rated 3 out of 5
Nice heater
This is a nice heater and works fine. The only real issue I have is that it is not nearly as quiet as they make it sound on the brochures and websites.
July 9, 2013
Rated 4 out of 5
Really good instructions. We have used it a few times, it is not always running, but great when you want to rise the temperature quickly.<br>
March 9, 2017
Rated 5 out of 5
good bargain, compact size,
My 20 year old Hayward heater was wonderful but huge. It finally died. After reading reviews, checking prices, etc, I found the Pentair which I bought. It's a good value, quiet, and the compact size if a real plus giving us more room in our pool equipment area.
January 22, 2017
over 5 years ago
Rated 5 out of 5
Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU - 460736
Great product delivered fast at a great price.
August 22, 2016
over 6 years ago
Rated 5 out of 5
1/2 the size, twice as efficient as old unit
Installed easily. Literally half the size of the old unit and heats up jacuzzi extremely quickly. Great unit.
October 1, 2018
over 3 years ago
Rated 5 out of 5
Efficient and Fast. Great Value!
Heats up the pool and hot tub very quickly. Great value for the price. You will be happy with this one!
July 14, 2020
1 year ago
Rated 5 out of 5
Got the heater installed and it works perfectly. Much more quiet and efficient than the old one... and more eco-friendly too!
September 20, 2016
over 5 years ago
Rated 5 out of 5
Great heater for the pool or spa
Nice heater and is super small but had large capacity. Seamless operation
September 18, 2018
over 5 years ago
Rated 5 out of 5
The pentair master temp 400 starts heating immediately after ignition! It heats the spa in minutes and can effectively keep it at a stable temperature. It’s also the first pool heater I’ve ever had that could effectively heat the pool without taking half a day or longer!
September 12, 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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