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Coates
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South of Seattle, in the industrial valley around Kent, Washington, Coates Heater Company has been working on one problem since the 1940s: how to heat water with electricity, reliably and in exactly the amount a job needs. Its heaters warm backyard spas, residential pools and large commercial installations, and they do it without a gas line, a flue or a flame.
Coates builds electric pool and spa heaters across a wide range of sizes, from small 1.5 kW units up to 57 kW, with most models available for single-phase or three-phase power. For large commercial projects the company offers heaters of up to 300 kW. That range says something about the company's character. Rather than build one product and stretch it to fit, Coates sizes its heaters to the job, whether that is a two-person spa on a condo balcony or a hotel pool.
An electric resistance heater is a simple machine. Water from the filter flows through a chamber where immersed elements heat it directly, much like a very large kettle, and a thermostat cycles the elements to hold the set temperature. Because nothing burns, there is no exhaust to vent and no gas supply to run, which makes electric heaters practical for indoor spas, small pools and places where gas is unavailable or restricted.
Coates makes electric heaters for pools, spas and commercial water heating. HVAC365 carries Coates electric pool and spa heaters on 240-volt power, including:
Other heating options appear in our pool heater collection.
Coates Heater Company is based in Kent, Washington, and has served the water heating market since the 1940s.
Coates pool and spa heaters range from 1.5 kW to 57 kW, most available in single-phase or three-phase versions, with heaters up to 300 kW for large commercial uses.
No. Coates heaters are electric resistance heaters, so they need no gas supply or exhaust venting, only a suitable electrical circuit.
Smaller units such as the 11 kW ST and 12 kW CE are commonly used on spas, while higher outputs like the 24 kW CPH suit larger bodies of water. Final sizing depends on water volume and the electrical service available.