Here is the most common standard Spa 5.5 KW Flo Thru Heater Element, fits Gecko, Spa Builders, HydroQuip and many others. At a super low online price with fast shipping.
Tech Note: For Balboa, we recommend the Bent Style 5.5 KW Part # 254034BI, the bend allows for temp sensor clearance. This element is great for spas equipped with 2 Speed Pumps, but with circ pump models, use Heater Element Part # 254014BI, low amperage is better with low flow pumps.