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
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  • Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Propane - 400,000 BTU | 460737
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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 20 questions Browse 20 questions and 22 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 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
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.
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
4.7 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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
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
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
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
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 3 years ago
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 3 years ago
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
1 year ago
Best heater
This is our second MasterTemp heater. We moved and the new house didn't have a heater and we loved the MasterTemp we had purchased for our previous pool. It heats very quickly and is quiet to run. Had the other heater for 4 years and it never had a problem. We've only had the new one for a few months and no issues yet either. Great value from Pool Supply too.
August 23, 2016
over 4 years ago
This was a replacement heater and I am very pleased with the more compact size and the ease at which it was installed.
August 22, 2016
over 4 years ago
Great heater for the pool or spa
Nice heater and is super small but had large capacity. Seamless operation
September 18, 2018
over 3 years ago
Adobe Acrobat PDF Brochure
Adobe Acrobat PDF Data Sheet
Adobe Acrobat PDF Eco-Friendly Brochure
Adobe Acrobat PDF Owners Manual

How do I register for the warranty with my new Pentair product?
For Pentair's warranty registration information, and to submit online, please click here.  You can also access more information about Pentair by visiting our manufacturer page.

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. If purchased online will only receive a sixty-day limited warranty.
^Labor Costs are not covered outside of US/Canada.
Product/Product Category Length of Warranty Requires Professional Installation TradeGrade
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  
MiniMax 75/100 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® 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 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 Sixty (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™ Aboveground 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    
ACU-TROL Commercial Controllers 5 Years    
ACU-TROL Commercial pH or ORP Probes 2 Year    
ACU-TROL Electronic Modules 5 Year    
IntelliChem Commercial Chemical Controller 1 year^    
IntelliChlor (CIC60P & CIC60S) Commercial Salt Chlorine Generator (w/o power center) 2 Years or 15,000 operative hours (whichever comes first)    
Heaters 1 Year    
Heat Pumps 2 years parts & labor^    
Lights 1 Year    
STARK Commercial Filters 3 years^    
THS Series Commercial Filters 3 years^    
Max-E-ProXF Variable Speed Pump 2 years  
WhisperFloXF Variable Speed Pump 2 years  
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.
This information was updated on 6/17/19. For the most current information and full warranty policy please visit www.pentair.com.

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Pool Supply Unlimited is an e-commerce company that loves water. We love to pump it, filter it, heat it, chlorinate it, light it up and stare at it while we're barbequing a fat, juicy steak. There are real pool professionals working here. Our guys have seen thousands of pools in their careers, no exaggeration. We are based in Southern California and can land most products to your door (within the 48 contiguous states) in less than a week.
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