CN-XL Series Pool Heat Exchangers

The CN-XL series of heat exchangers was designed specifically for commercial sized swimming pools. They provide a simplified and practical means of indirectly heating both commercial and municipal pools. The vast majority of hotels, YMCAs, municipal arenas, community centers, universities/colleges and condominiums already utilize boilers for makeup air and domestic water heating. Typically these boilers are oversized and are not in operation on a continuous basis even during the winter months. Utilizing this excess capacity also ensures a more continuous operation of the boiler which reduces cycling.

The CN-XL series heat exchangers are available in capacities ranging to 3,000,000 Btu/hr and are therefore suitable for large Olympic size swimming pools.

In addition to providing sufficient surface area to facilitate high rates of heat transfer these units are also designed to handle a flow rate of 400 USGPM of pool water with a pressure loss of only 3.2 psi (7.5 feet water). As these are engineered products it is important that they are correctly sized for the application. Please contact us with the design parameters and we can size a suitable unit and provide a data sheet with the design criteria and flow characteristics.


  • High Heat Transfer Capacities
  • Rugged Design
  • Resistant to Corrosion From Both Chlorinated and Saltwater Pools
  • Removable Tubestacks Enables Easy Cleaning
  • Quick Delivery from Stock


  • Large Scale Pools
  • Hot Tubs
  • Geothermal Pool Heating
  • Solar Pool Heating

Standard Material:

Tube side (Pool Water): Cupro Nickel
Shell Side (Boiler Water): Cast Iron Steel

Maximum Pressure:

Hot Side: 90 psig
Cold Side: 90 psig

Maximum Temperature:

250 Deg. F



CN-XL Quick Reference Chart (based on boiler water temperature 180°F)

Part Number Pool Capacity Pool Water Flow Boiler Water Flow Boiler Capacity Connections
CN650 60000 127 31.7 650,000 1 1/2″ NPT 3″ NPT
CN1000 120000 222 54.5 1,000,000 2″ NPT 3″ NPT
CN1500 200000 330 84.5 1,500,000 2 1/2″ NPT 4″ Flange
CN2000 200000 500 126 2000000 3″ NPT 5″ Flange

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Download the CN-XL Brochure