Hot Tub Heater Low Flo for C3226-1A fits Sundance fits Jacuzzi Spas SD6500-063 / 6500-63 C3226-1A, 500-063. Therm Products Low Flow Titanium Heater C3226-1A 120/240 Volt, 1kW/4kW, 26" x 6" trombone style with built in thermal switch, 26" 3-wire pigtail Features Titanium extended life element. Meets or exceeds original spa heater assembly specifications as made by Laing Thermotech (Laing no longer makes heaters). Fits Sundance, fits Jacuzzi 6500-063, Laing 6518.1, 6698.1, E24060LHS, BX5959, Therm Products C3226-1A, SEH-5500-NH-6699, SEH-4300-NHW-6595.
Note for Sundance/Jacuzzi: In November 2010, the heater barb adapter 6560-034 was removed from all 680/780 models with a circulation pump. When the spa was manufactured, in its place was a plug, 6000-124 installed. This heater does not come with the plug 6000-124 or the bard adapter 6540-034

Compatible with Sundance Models used on:

Compatible with Jacuzzi Models used on:  

Also: 
Compatible with Watkins Hot Spring and other hot tub spas using Laing-design lo-flo heaters. 

Other numbers: Laing 6518.1, Therm Products C3226-1A, E24060LHS, 6500-063, BX5959

Must be used with: 6540-034: .125" MPT x .375" Barb Adapter, 0.060" I.D. Hole
As of 2011+ used only on the 680 Dover Model, changed to stainless in 2011