In-Line Spa Heaters

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Coates Heater Company offers the most extensive selection of electric heaters for pools and spas, blending premium materials and innovative engineering. From our powerful 300kW commercial pool heater to our compact 1.5kW in-line spa heater, Coates products deliver the quality and reliability you expect.

These in-line spa heaters are available in 1.5kW for 120-volt applications and 5.5kW for 240-volt applications. The ST Series, ideal for small residential pools and spas, comes in 5.5kW and 11kW versions for 240-volt single-phase power.

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