Titanium Flo-Thru Heater Element 5.5 KWTitanium Hot Tub Heater Element 12 0100F K The Flo Thru Heater element is the most common style on the market. The low profile design and precision American manufacturing makes this heater element easier to replace and more durable than other lesser brands. Titanium heater elements are the longest lasting and most durable hot tub heater element on the market. Used by most manufacturers for new spas due to longer life and less warranty claims compared