The 4kW Sundance Low Flow Trombone Heater is a high-performance replacement heater designed for Jacuzzi and Sundance Spas with low water circulation. Featuring a trombone-style design, this heater ensures efficient heating even in spas with reduced flow, making it ideal for specific models like the Sundance Metro, Caprio, and Jacuzzi J310. The titanium heating element provides excellent corrosion resistance, while the stainless steel tube construction ensures durability. It includes 3/4" hose barb connections for easy integration and a built-in thermal switch for added safety. With options of 4kW at 240V and 1kW at 120V, this heater delivers reliable, consistent performance for your spa system.