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Coates ST Series Electric Spa Heaters 5.5-11kw Item: ST-SERIES-HEATERS

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The built-in pressure switch prevents operation when there is no water flow and allows operation at flow rates between 15 GPM and 80 GPM. The stainless steel tank is designed to optimize heat transfer by directing the water flow over the incoloy elements efficiently.


  • Incoloy heating elements
  • Pressure switch
  • Close differential thermostat
  • Manual reset high temp limit
  • Heavy-duty contactors
  • Element "on" light
  • 1-1/2 x 2 inch union connections for PVC pipe

UL Listed for Indoor/Outdoor Installation.

17-1/2"L x 4"W x 14"H

Available in 5.5kw and 11kw.

ST Series Electric Spa Heater 5.5kw 220 Volt 23 Amps Single-Phase Item: #12406ST
ST Series Electric SpaHeater 11kw 220 Volt 46 Amps Single-Phase Item: #12411ST