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Home Raypak Raytherm P-1125 #48 Commercial Indoor Swimming Pool Heater with Unitherm Governor | Natural Gas 1,124,700 BTUH | 001347
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. 

Raypak Raytherm P-1125 #48 Commercial Indoor Swimming Pool Heater with Unitherm Governor | Natural Gas 1,124,700 BTUH | 001347

Raypak Raytherm P-1125 #48 Commercial Indoor Swimming Pool Heater with Unitherm Governor | Natural Gas 1,124,700 BTUH | 001347
This item has been discontinued.

Parts AvailableParts Available
Platinum Preferred Manufacturer
  • Submittal Form Required Before Ordering
  • Indoor Installations Only
  • 80-82% Thermal Efficiency
  • Fuel-Saving Electronic Ignition
  • 7/8" Diameter Finned Cupro-Nickel Tubes
  • Low Operating Cost. Low Maintenance Cost. Easy Service.
  • Raytherm Commercial Heater Options Click here
Q & A
Raytherm® Indoor Pool Heaters, 962-1826
Ideal for: Clubs. Universities. Municipalities. Watersport Centers. Large residential pools.
Raypak's Raytherm® line of atmospheric pool heaters offers rugged construction and simple operation at low cost.
Full Input BTUH Indoor
Stack Dia.
Bypass Options
Unitherm Gobernor H-Style Bypass None (Field-Supplied) CWR
P-962 961,700 14" STD, no pump Yes Yes Yes
P-1125 1,124,700 16" STD, no pump Yes Yes Yes
P-1223 1,222,500 16" STD, no pump Yes Yes Yes
P-1336 1,336,600 18"   STD, rear pump Yes Yes
P-1468 1,467,000 18"   STD, rear pump Yes Yes
P-1631 1,630,000 18"   STD, rear pump Yes Yes
P-1826 1,825,600 20"   STD, rear pump Yes Yes
Rugged All-Brass Headers
Resist corrosion, and are easily removed for inspection or service. AB 1953 low-lead complaint.
Cupro-nickel Finned-tube
Single bank, straight through design delivers lowest pressure drop. Integral fins have ten times the heat transfer surface of plain tubes. Cupro-nickel tubes provide superior chemical resistance over copper for tough commercial installations.
On-off Operation.
Corrosion Resistant Steel
Fittings are brush galvanized against rust. Heat shields are corrosion-resistant steel. Jacket has Polytuf powder coat finish.
24-Volt Controls
Are totally enclosed for protection. Cover is easily removed for inspection and service.
Floating Return Header
Immunizes heat exchanger to thermal shock.
Tube Sheet and "O" Ring Construction
Eliminates the repair and maintenance problems associated with rolling tubes directly into a casting.
Interlocking Refractory Panels
With sealed corners reduce radiation losses.
Stainless Steel Burners
Maintain precise combustion, burn quietly and won't clog or corrode.
Slide-out Burner Tray
Allows easy inspection and service.
Spark-to-Pilot Ignition
The most dependable ignition method available.
Available for natural gas or propane.
Bypass Options:
  • Unitherm Governor (std on 926-1178)
    This provides a temperature-activated valve inside the header which varies flow through the heat exchanger. No pump on the heater. Flow comes from an external source.
  • H-Style Bypass (std on 1287-1758)
    This provides a larger manually-set bypass to bring heated water back to the inlet, raising the temp inside the heat exchanger. For size 1287, the H-bypass is horizontal with a rear-mounted pump. For sizes 1414-1758, the H-bypass is vertical with a front-mounted pump.
  • None (field-supplied)
    Protection provided by others and mounted in the field.
  • Cold-Water Run (CWR)
    This approach uses digital controls to vary the performance of a variable-speed pump which governs how much heated water is returned to the inlet. Performance is adjusted in real time.

Brand: Raypak
BTU Rating
Gas Type
Natural Gas
Q & A
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Does this unit require a bypass?
A shopper on Jun 23, 2020
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Extended Warranty Program
Raypak pool and spa heaters are engineered to perform and built to last. The brand you know and trust is bringing you more peace of mind with a 2-year extended warranty on residential pool and spa heating products. If not registered, warranty is only 90 days.
The benefits of Raypak's extended warranty, include:
  • 2-year extended warranty
  • Professional in person service
  • 24-hour or same-day service
  • Genuine Raypak parts
  • Factory technical support
The product registration process is quick and easy to complete. To take advantage of the extended warranty follow these steps:
  1. Have your pool or spa heater professionally installed. Click here for a list of Raypak installation partners.
  2. Register your product online at www.raypak.com/warranty within 90 days of installation.
Warranties are effective for products installed on or after June 17, 2019. See product warranty for specific details. Conditions apply. For full warranty by product including exclusions and how to make a claim, please visit www.raypak.com/warranty.
This information was updated on 4/23/2022. For the most current information and full warranty policy please visit www.raypak.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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