Coates ST Series Electric Heater (Model: 12406ST)

Product Overview

As a retailer of hot tub spare parts, I’m featuring the Coates ST Series 5.5kW Electric Heater, a compact yet powerful heating solution designed specifically for spas up to 400 gallons. This professional-grade unit offers efficient heating in a space-saving design.

Key Features

• Digital thermostat control
• Incoloy heating elements
• Built-in flow switch protection
• Heavy-duty contactors
• Element operation indicator

Design Innovation

• Compact form factor
• Optimized water flow pattern
• Stainless steel tank construction
• Space-saving configuration
• Under-skirt installation capability

Technical Specifications

Specification	Detail
Model Number	12406ST
Power Output	5.5kW
Voltage	240V
Phase	Single
Flow Range	15-80 GPM
Dimensions	17-1/2″L x 4″W x 14″H
Connection Size	1-1/2″ x 2″
Connection Type	Union
Tank Material	Stainless Steel
Element Type	Incoloy
Max Spa Size	400 Gallons

Safety Systems

• Manual reset high temp limit
• Integrated flow switch
• Operation indicator light
• Contactor protection
• Temperature monitoring

Installation Features

• Universal union connections
• Compact dimensions
• Flexible positioning
• Under-skirt compatible
• PVC pipe compatibility

Performance Benefits

• Efficient heat transfer
• Wide flow rate tolerance
• Digital temperature control
• Quick heating response
• Energy-efficient operation

Construction Quality

• Premium Incoloy elements
• Stainless steel construction
• Professional-grade components
• Durable contactors
• Weather-resistant design

Usage Limitations

• Not recommended for salt chlorination systems
• Maximum spa capacity: 400 gallons
• Minimum flow rate: 15 GPM
• Maximum flow rate: 80 GPM

Note: Professional installation recommended to ensure proper system integration and safety compliance. Not compatible with salt chlorination systems