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Sundance Spa 2000+ Smart Heater Assembly 5.5 Kw, SUN6500-3106500-310 Sundance Spa Smart Heater Assembly, 5.5 kW For All USA/Canada 60 Hz Models, 2000-2015 (C3314-1)IMPORTANT NOTE:Plastic Smart Heaters (6500-310 240V/5.5 kW, 6500-316 230V/5.5kW) have a slightly smaller dry well. When installing these heaters into spas manufactured prior to April 2007, you can no longer use the OEM Hi-Limit Sensor since it is too large to fit into the new heaters sensor well.We never recommend forcing a hi-limit sensor into or drilling out a sensor well for any reason since this practice can damage the heater and result in leaks.For this reason, we recommend replacing both the Smart Heater and Hi-Limit sensorYou Will Receive One Item