Home Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | 460736
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Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | 460736

Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | 460736 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | 460736 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU | 460736

Energy EfficientEnergy Efficient
Parts AvailableParts Available
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
  • 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 30 questions Browse 30 questions and 25 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.
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.
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
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.
I have a saltwater pool. Is the heat exchanger Stainless Steel?
Jerry J on Nov 27, 2020
what is the heating element material, cupronickel or copper?
Young L on Nov 5, 2020
need to know what size vent for pentair 400 with horizontal run ?
gene w on Oct 7, 2020
what size vent is required ?
gene w on Oct 7, 2020
Is the 472577 model the same 460736?
blake S on Sep 17, 2020
i have a 472577 Pentair gas heater, is the 460736 the same heater?
blake S on Sep 16, 2020
My heater in pool mode cycles and does not work. In spa mode it fires right up. Thoughts on this problem?
Daniel O on Aug 5, 2020
How long would this currently take to ship with COVID delays?
A shopper on Jun 9, 2020
What diameter gas line is needed if gas source is 130 ft. Away?
Donald B on Jun 1, 2019
Size heater needed for a 11'x11'x4' spa in ground pool. 3600 gals? I don't want a long wait to heat. Thanks.
greg p on May 17, 2018
4.8 / 5.0
15 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
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 4 years ago
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 4 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 2 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
8 months 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 4 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 4 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
6 months ago
Adobe Acrobat PDF Brochure
Adobe Acrobat PDF Data Sheet
Adobe Acrobat PDF Eco-Friendly Brochure
Adobe Acrobat PDF Owners Manual

Register your Pentair product online at www.pentair.com.

While the majority of Pentair products are covered by a 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 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. TradeGrade products purchased online will receive a sixty-day parts ONLY limited warranty. View the list of TradeGrade Products.
^Labor Costs are not covered outside of US/Canada.
Warranty by Product / Product Category (subject to TradeGrade requirements if applicable)
Length of Warranty Requires Professional Installation
SunTouch® Solar and SolarTouch® Control Systems 3 Years Yes
Automation equipment, excluding SunTouch® Solar and SolarTouch®Control Systems 1 Year Yes
IntelliConnect™ 1 Year Yes
IntelliCenter® 1 Year Yes
IntelliLevel™ 1 Year Yes
Filters 1 Year Yes
ETi™ 400 3 Years Parts & Labor^ Yes
UltraTemp ETi™ 3 Years Parts & Labor^ Yes
Heaters 2 Years Yes
Heat Pumps
Heat Pumps 2 Years Parts & Labor^ Yes
Compressor 10 Years Parts & Labor^ Yes
Titanium Heat Exchanger Lifetime Yes
Light Bulbs 60 Days Yes
Lights 1 Year Yes
IntelliBrite® 5G White LED Light 2 Years Yes
MicroBrite™ 2 Years Yes
Single and Dual Speed Pumps 1 Year Yes
Single-Phase, TEFC Super Duty Pumps 2 Years Yes
Select Variable Speed Pumps 3 Years  
SuperFlo® VS, SuperFlo® VST and SuperMax® VS Variable Speed Pumps 2 Years Yes
IntelliFlo (#011028) and IntelliPro (#P6E6VS4H-209, #013028) 2 Years Yes
IntelliFlo 2 VST (#011055) and IntelliPro 2 VST (#013001) 3 Years Yes
IntelliFlo VSF (#011056) and IntelliFloXF VSF (#022056) 3 Years Yes
IntelliPro VSF (#013004) and IntelliProXF VSF (#023056) 3 Years Yes
BioShield® UV Disinfection Sanitizer 2 Years Yes
BioShield Sanitizer Quartz Sleeve only 1 Year  
IntelliChlor® Salt Chlorine Generator (without Power Center) 2 Years  
iChlor™ Salt Chlorine Generator - Bundle with Power Supply and Cell (iChlor 15 and iChlor 30) 3 Years Yes
White Goods / Water Features / Valves
White Goods and Water Features and Valves 1 Year Yes
Maintenance Equipment / Replacement Parts
Maintenance Equipment and Replacement Parts
60 Days (with exception of motors)
Single-Phase, TEFC Super Duty Replacement Motors 2 Years Yes
Above Ground Systems
Above Ground Systems 1 Year  
Cleaners (Automatic cleaners purchased in the USA from entities outside the USA do not qualify for any warranty)
Tires, Rollers, Brushes, Climbing Rings, Cartridge Fillers 60 Days  
Suction Seal, Foot Pad, Wings, Bumper, Strap, Seal Flaps 1 Year  
Legend and Legend II Inground Cleaner 1 Year  
Racer® Inground Cleaners 1 Year  
Platinum™ Inground Cleaner 1 Year  
Warrior® Inground Cleaner 2 Years  
Lil Rebel™ Above Ground Cleaner 2 Years  
Tires, Rollers, (Rebel, Warrior and Lil Rebel only) 90 days  
Dorado® Inground Cleaner 2 Years  
Kreepy Krauly® Inground Cleaner 2 Years  
Kruiser™ Inground Cleaner 2 Years  
Great White® Inground Cleaner 2 Years  
Racer LS® Inground Cleaner 2 Years  
Rebel® Inground Cleaner 2 Years  
SandShark™ Inground Cleaner 2 Years  
Prowler® 820 and Prowler 830 Inground Cleaners 2 Years  
Prowler® 910, 920 and Prowler 930 Inground Cleaners 2 Years  
ACU-TROL AK Color and Accessories 1 Year Yes
ACU-TROL Commercial Controllers 5 Years Yes
ACU-TROL Commercial pH or ORP Probes 2 Year Yes
ACU-TROL Electronic Modules 5 Year Yes
IntelliChem Commercial Chemical Controller 2 Years^ Yes
IntelliChlor (CIC60P & CIC60S) Commercial Salt Chlorine Generator (w/o power center) 2 Years or 15,000 operative hours (whichever comes first) Yes
ETi Heater 3 Years Yes
Heat Pumps 2 Years parts & labor^ Yes
IntelliBrite 5g WHITE Lights 2 Years Yes
STARK Commercial Filters 15 Years tank (prorated years 4-15); 3 Years internals/valves/contollers^ Yes
THS Series Commercial Filters 10 Years tank (prorated years 4-10); 3 Years internals/valves/controllers^ Yes
WhisperFloXF/Max-E-ProXF Variable Speed 5HP Pump 2 Years Yes
Acu Drive XS Variable Speed Drive 1 Year unless extended warranty (3 or 6 Years) purchased Yes
All Other Commercial Products 1 Year subject to TradeGrade requirements if applicable Yes
Exceptions that may result in denial of a warranty claim: 
  1. Damage caused by careless handling, improper repackaging, or shipping.
  2. Damage due to misapplication, misuse, abuse or failure to operate equipment as specified in the owner's manual.
  3. Damage caused by failure to install products as specified in the owner's manual.
  4. Damage due to unauthorized product modifications or failure to use Pentair original replacement parts.
  5. Damage caused by negligence, or failure to properly maintain products as specified in the owner's manual.
  6. Damage caused by failure to maintain water chemistry in conformity with the standards of the swimming pool industry for any length of time.
  7. Damage caused by water freezing inside the product.
  8. Accidental damage, fire, acts of God, or other circumstances outside the control of Pentair.
  9. Please see warranty card for commercial exceptions.
Visit www.pentair.com to submit your product warranty registration.
This information was updated on 9/25/2020. For the most current information and full warranty policy please visit www.pentair.com.

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