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Pentair MasterTemp Pool and Spa Heater 125k BTU

Pentair MasterTemp Pool and Spa Heater 125k BTU

Pentair Master Temp Pool and Spa Heater 125k BTU

The remarkably affordable new MasterTemp 125 heater gives you the energy savings and advanced operating features that were only available from much larger heaters.

Purchase the Pentair MasterTemp 125 Pool & Spa Heater


The remarkably affordable new MasterTemp 125 heater gives you the energy savings and advanced operating features that were only available from much larger heaters. With its revolutionary pre-mixed gas combustion technology, the MasterTemp 125 heater offers 82% thermal efficiency – the highest of any heater in its category. Its 1-1/2″ plumbing is ideal for smaller applications, including aboveground pools, spas and inground pools up to 15,000 gallons. Featuring the first ever rotating, digital display offered in its class, the MasterTemp 125 heater provides valuable information conveniently and at the touch of a button. Plus, its lightweight, compact design makes the MasterTemp 125 heater easier to install than any other heater in its class – reducing labor costs which saves you money.


  • 82% energy efficiency is highest in its class.
  • High-performance, affordable heating with premium features.
  • 1-1/2″ plumbing – ideal for smaller bodies of water up to 15,000 gallons.
  • Pre-mixed combustion technology for ultra-fast heat-up.
  • Rotating digital display – the first in its price category – provides fast, easy access for programming and monitoring.
  • Certified for low NOx emissions.
  • Certified for outdoor and indoor – vented installations.

Raypak Low NOx Pool and Spa Heaters

Raypak Low NOx Pool and Spa Heaters

Raypak Low NOx Pool and Spa Heaters

Raypak’s Low Emissions units use combustion control to minimize levels of nitrogen oxides (NOx).

Purchase Raypak Low Nox Gas Heaters

Your pool and spa is a long-term investment that you, your family and friends will enjoy year after year. Now, there’s an easier way to enjoy that investment more often, more reliably and more efficiently throughout the year…the Raypak Residential Digital Low NOx pool and spa heater.

Think about being able to use your pool or spa at the perfect comfort level even when Fall arrives…or when the first chill of Winter is felt in the wind…or in the Spring or Summer when evenings can turn chilly in a minute! Helping you get more enjoyment from your pool or spa is the smart idea behind the Raypak Heater.

raypak low nox pool heater basic data

Raypak Gas Heater Features:

Raypak’s Low Emissions units use combustion control to minimize levels of nitrogen oxides (NOx).  The units meet emissions standards in all Low NOx areas, from Los Angeles (SCAQMD Rule 1146.2 certified) through the San Joaquin Valley (SJAPCD Rule 4308), and any other areas applying the stringent SCAQMD standard – the “Gold Standard” of emissions regulations – to residential pool heaters.

Available for natural gas only

Digital Controls

provide solid-state reliability and accuracy and clear diagnostics.  Setting it for the temperature you want is a snap…push a few buttons and walk away.

PolyTuf Textured Powder Coating

The Raypak gas heater has a polyester-coated, non-corrosive cabinet that is more durable than solventborne- and waterborne-coated metal cabinets. Every piece of sheet metal goes through a 7-stage wash system, making certain the powder paint has a perfect bond. Underneath the tough, yet beautiful finish you will find galvanized metal that offers superior rust prevention and years of durable service

Wind-Resistant Design

No need for fans to combat drafting problems. This heater is designed to draft naturally in outdoor installations with its exclusive low-profile design. It is so thoughtfully and carefully designed it actually protects itself from the things that tend to stifle ordinary pool and spa heaters. It delivers uninterrupted heating performance regardless of falling leaves, wind, airborne debris, rain, downdrafts, updrafts, sleet, snow, etc.

Polymer Headers

Polymer headers prevent rust stains from harming your pool’s surface, giving you years of trouble-free swimming pleasure.

All-Copper-Fin-Tube Heat Exchanger

The fin tubes of the heat exchanger are each made from a single piece of extruded copper. This integral-fin design allows maximum heat transfer to be attained and maintained. These headers are specifically designed for the residential market…for commercial installations, use the ASME models.

Stainless Steel Tube Sheet

Stainless steel tube sheets are used on all Raypak gas heaters. This allows for a completely nonferrous waterway, leaving your pool truly rust-free.

CPVC 2″ Water Connections

Standard with every Raypak is a set of 2″ slip-fit CPVC water connections to make your installation secure and effortless.

Condensation Protection

The Unitherm Governor inside the header helps reduce condensation from low inlet water temperatures. It automatically regulates the water flow to help keep the water temperature in the heat exchanger above 105°F. Both water temperature and water flow rate are controlled to eliminate condensation, sooting, and scale build-up that can shorten heater life.

High Flow Rates

The Raypak gas heater comes with an automatic bypass built into the header.  You’ll find that the heater is capable of handling water flow at a rate up to 125 GPM.

Burner Tray

Every burner tray is built to last, from the stainless steel burners to the aluminized metal used in the heat sensitive areas. Innovative design allows for the easy removal of the tray and burners for servicing.

Fire Tile

A ceramic fiber combustion box keeps your heater running efficiently while keeping the outside jacket cool. By using this space-age material the heater won’t retain residual heat after it is turned off, allowing it to be installed without the use of costly metal heat sinks.


Energy-smart Raypak heaters consistently achieve the highest efficiency ratings.  They exceed all federal and state standards.

Raypak Low NOx Manual

Pool and Spa Heater Options

Pool and Spa Heaters

A pool heater heats up the temperature you want for the water in your pool. We carry many different types of Pool Heaters. The three main types of Pool Heaters are Solar Pool Heaters, Gas Pool Heaters, and Swimming Pool Heat Pumps.

Solar Pool Heaters are heaters that collect energy from the suns heat, which is transferred into your swimming pool water heating the pool. Depending on the size of your pool, where you live and the average outside air temperature (a properly sized Solar Heater will increase the temperature of your pool by 10-15 degrees), a Solar Pool Heater may be the right choice for you. Another popular pool heating method would be Gas Pool Heaters. The Gas Pool Heaters are great for heating up your pool during cool periods or in the evening for a spa. Gas pool heaters have the highest specific output, so for occasional pool heat-up they are by far the fastest method of pool heating. As the name implies, Gas Pool Heaters run off Natural Gas or Propane. A Propane Pool Heater takes fuel from a propane tank, while the Natural Gas Pool Heaters need a line for fuel. Costs Monthly will depend on the usage and latest fuel prices for either the Gas Pool Heaters, or Propane Pool Heaters.

Lastly, we have our Swimming Pool Heat Pump. The Swimming Pool Heat Pump absorbs the heat from the surrounding ambient air; which is then transferred via a heat exchanger to your pool water. Heat pumps are powered by electricity, but as the air is heated by the sun, the heat pump is able to absorb that heat and transfer it into your pool water. Check into each Pool Heater and brand for more details. We carry many different brands of Pool Heaters such as Pentair Master Temp, Sta-Rite Max-E-Therm, Jandy Legacy LRZE & LRZM, Raypak Digital, Pentair Ultra Temp, Jandy LXi, Jandy Hi-E2, Jandy EE-Ti Heat Pumps, Raypak Digital ASME Comm, and Hayward Universal H-Series Pool Heaters.

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Which Pool Heater will be more effective for you and the environment you live in? Best Buy Pool Supply will help you find your perfect pool heater today. The easy link below can be used for assistance.

Which heater is best for my pool? The answer is: whichever heater is least expensive to operate. Depending on where you live, electricity can be very expensive or inexpensive. The same goes for gas. Natural gas can be very expensive or inexpensive. Propane can be very expensive or inexpensive. If you live in an area where you get a lot of sunlight, solar is the way to go. Your goal with the heater is to maintain a preferred temperature for swimming. The best way to achieve this is by using the least expensive heater available to maintain the temperature that you prefer. You can start by comparing pricing with your utility companies. Contact your gas company and find the costs involved with running a natural gas line. Propane heaters burn 1 gallon per hour per 100,000 BTU. A 400k BTU heater will burn 4 gallons per hour.

Which heater is best for my spa? The answer is: a gas heater. More specifically, the largest gas heater you’re willing to pay for. The reason is: the larger heater you buy, the faster it will heat up the spa. Do you want to wait 30 minutes to get into the spa or do you want to wait two hours? This is where personal preference becomes important. Buying a smaller heater will be less expensive to operate and maintain but will have a longer heat up time. If you don’t mind waiting 2 hours, buy a smaller heater.

What are the differences between gas, electric, and solar heaters? Gas heaters can generate heat all year long and are not limited by weather. Gas heaters are preferred for spas due to faster heat up times. Electric heat pumps work similar to solar due to being limited by weather. These two heating options can only generate a certain amount of heat based on the ambient air temperature. Heat pumps and solar generate heat over time up to a certain amount. Generally the amount is 15 degrees above ambient air temperature. The larger size heat pump you have and the larger solar panel system, the faster you can get to 15 degrees. Smaller heat pumps and solar panel systems take longer to generate the 15 degrees.

What types of heaters are available for pools? There are three types of heaters: Gas, Electric, and Solar. Gas heaters require a natural gas line or propane line. Electric heat pumps require a dedicated circuit. Solar panels are installed either on the roof, for inground pools, or alongside an aboveground pool.

What size heater do I need for my pool?

What size heater do I need for my spa?