Coates ST Series Electric Spa Heater 5.5KW, 240V, 23 A, 12406ST

Mfg #:
12406ST |
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Important Notes About Ordering Coates Heaters

Coates heaters are a made-to-order product. When you order your Coates heater from E-Z Test Pool Supplies, we'll confirm a lead time with the manufacturer which typically can range up to 6-10 weeks.

E-Z Test Pool Supplies cannot fulfill orders for Coates heaters in the following states: Washington, Oregon, Idaho, California. Any orders placed within these states will be canceled and refunded.

Coates 12406ST Electric Heater; 5.5 kW; 1-Phase; 240 V; 23 A

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

Coates ST-Series heater is a compact electric spa heater that is available in a 5.5kW or 11kW version. The 12406ST is equipped with a flow switch that allows operation at flow rates of 15GPM to 80GPM. The stainless steel tank is designed to optimize heat transfer by efficiently directing the water flow over the Incoloy heating element.


  • Incoloy heating elements
  • Digital thermostat
  • Manual reset high temp limit
  • Flow switch
  • Heavy duty contactors
  • Element “on” light
  • 1-1/2 x 2″ union connections for PVC pip
  • Stainless steel manifold
  • Pressure switch


AmperageDraw 23 A
Brand Coates
CabinetDepth 14 Inch
CabinetHeight 17-1/2 Inch
CabinetWidth 4 Inch
FlowRate 15 - 80 gpm
HeatOutput 5.5 kW
HeatOutputBTUH 18772
Item Electric Heater
MaximumBreakerSize 30 A
Phase 1-Phase
Series ST
VoltageRating 240 V
WaterConnection 1-1/2 Inch x 2 Inch Union
WireSize 10 AWG


Install Guide

Technical Info


Operational Manual

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