Home Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 300,000 BTU - 460734
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Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 300,000 BTU - 460734

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Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 300,000 BTU - 460734 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 300,000 BTU - 460734 Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 300,000 BTU - 460734

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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
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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.
  • afe 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 300,000
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 16 questions Browse 16 questions and 19 answers
What are the natural gas line size requirements for the 300,000 but heater?
James R on Jun 2, 2017
Who is qualified as a professional installer? Is a master plumber a qualified installer?
Jim M on May 9, 2016
The heater shakes and rumbles when starting ?
A shopper on May 15, 2018
BEST ANSWER: Does the heater actually ignite and run ???
If not, then you system is wired for 110v, the heater comes setup for 220v, just plug in red module, and it should take right off and ignite.
Is this heater suitable to my 30000g pool ?
A shopper on Jun 15, 2017
BEST ANSWER: It will work just fine, however for a 30,000gal I would recommend a 400,000btu. The heater itself will have less strain and ultimately last longer. The larger heater will also heat the pool or spa quicker.
I need service for my heater. I get the "E05" or "E0S" error now. Who do I call for service?
A shopper on Jul 18, 2016
BEST ANSWER: you can call us if you are local. If not you can contact Pentair and they will give you the number of someone in your area. 800-831-7133

where is the gas connection on this heater ?
nickolas a on Jul 14, 2018
BEST ANSWER: On left hand side of heater. Also be aware that the "gas valve" comes from factory in the "off" position and will have to be toggled to "on" prior to operating
I have a 32000 gallon pool with spa. Will this one do the trick. I am in so Cal and it is always warm in summer and never needed a heater what so ever. I'm selling my house and thought I should have one included with the pool. What do you think? The one I'm looking at is the 300,000 N.G. #460734 elect. ignition.
Carrie H on May 8, 2017
BEST ANSWER: If your intent is to heat the spa only, then this heater will work well. I live in Texas, much colder climate, and the heater will heat our spa to 102 degrees in about 45 minutes to 1 hour depending on outside air temp. To heat a 32000 gallon pool is another story! That's a big pool and this heater can do it but I don't know how quickly since we don't heat our pool. Obviously the 400,000 unit will do it faster but at a higher cost to purchase the heater. Most people want to use their spa in the winter and this heater will do the job.
What is a professional install?
A shopper on May 19, 2016
BEST ANSWER: AProfessional install is:
Hooking up electric
Plumbing the heater to the pool or spa
Those are the cheaper of the 3 to hookup
Running the gas line andHooking up is a bit more extensive.
All three should be done by a professional that has a understanding in the building codes and regulations.
I have a 20000 gallon pool and a 3/4 horse power pump - what is my gpm (gallons per minute)... just need a ball park figure, or what would be a very minimal number, considering everything is working correctly ?
A shopper on May 8, 2021
BEST ANSWER: Depends on the type of pump you have at what rpm it is running. Generally speaking it can be from 10gpm to 30gpm. Size of your pool doesn't matter.
I dont have gas service will this work with electricity only or will i need to hire the gas company?
spaguy on Nov 2, 2018
BEST ANSWER: You will need some type of gas to run any heater other than electric heaters. If you get a very large propane tank, you will need a propane version of this heater.
who installed your unit? warranty?
hutch on May 29, 2017
My pool guy installed the heater - if you have a qualified pool guy it adds a year to the warranty ( or so they claim)
will a Pentair model 460734 300k btu natural gas pool heater work indoors?
Kath on Feb 15, 2017
BEST ANSWER: You can use the Mastertemp indoors but will need to get a indoor vent hood so that you can vent the exhaust.
I have a salt system - does the heater need to have cupro-nickel exchanger or is copper OK? Does the 300BTU come with cupro-nickel?
John S on Jun 26, 2016
BEST ANSWER: We have a 10k gallon saltwater pool with the mastertemp 300, running flawlessly now for 1.5 years. We maintain the pool ourselves but I did seek the advice of a pool guy who is a family friend and he did not feel that the cupro-nickel heat exchanger was worth the extra money. I guess time will tell. He did recommend buying the largest Heater our gas line would support, which we did. It will raise the pool temp 3+ degrees an hour depending on ambient temperature. Very pleased so far.

What size gas pool heater is needed for a 12,000 gallon pool size ?
A shopper on Sep 17, 2015
BEST ANSWER: My pool is about 10,600 gallon and am using the 300,000 btu. It seems to work fine and raised the temp from 77 to 87 in 6 to 7 hours if I remember correctly.
Where can I purchase a stack flue sensor for model 460734?
Diana B on Jun 7, 2020
Looking HD model of Master Temp 200 btu propane?
A shopper on Jul 18, 2019
4.6 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Nice Heater
Installed during pool remodel, heats the spa in 20 min., way smaller than previous unit. So far, so good. I'll keep you informed.
October 3, 2016
over 5 years ago
Rated 5 out of 5
The unit arrived, in Gree Bay, Wi.in four days. It was a snap.to install.And wire up. In short, Awesome.
July 2, 2017
over 4 years ago
Rated 4 out of 5
Great heater
Best price, as described, works great. I strongly recommend a professional install to make warranty valid.Very easy to install and operate.<br>
March 9, 2017
Rated 5 out of 5
Easy install and works great. Very efficient and heats pool very quickly.
June 6, 2020
1 year ago
Rated 4 out of 5
Good Pool Heater
This Pool Heater is great for Pool & Spa. Have used twice with good results.
November 11, 2018
over 4 years ago
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Register your Pentair product online at www.pentair.com.

  • LIMITED WARRANTY: Pentair warrants its products to be free from defects in material and/or workmanship for a period of sixty (60) days (parts only) from the original date of purchase and/or installation. Customer agrees to prepay all shipping charges to Pentair.
  • EXTENDED WARRANTY: To receive a product extended warranty (longer than 60 days from the original date of installation), customer must:
  1. Register the product;
  2. Provide a copy of the sales receipt; and
  3. Provide a copy of the installation invoice, provided by the qualified installer, within 60 days of installation (if required). Certain products do not require qualified installation but still require product registration and copy of the sales receipt to receive the extended warranty.
  • TRADEGRADE WARRANTY: TradeGrade products must be purchased from a retail store (brick and mortar), pool builder or pool service company. If purchased online (via internet) the product will only receive a sixty (60) day limited warranty. View the list of TradeGrade products here.
  • ECOMMERCE (EC) WARRANTY: Products purchased from an Authorized Pentair Online Reseller 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. To receive an eCommerce warranty, customer must:
  1. Register the product, and
  2. Provide a copy of the sales receipt
Visit www.pentair.com to submit your product warranty registration.
This information was updated on 04/05/2021. For the most current information and full warranty policy please visit www.pentair.com/warranty.

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