Hot Tub Compatible With Saratoga Spas 4.0KW, 240 Volt Vertical Low Flow Heater HYD26-H3037-5S-KThis 4. 0KW, 240 volt vertical low flow heater is designed explicitly for Saratoga Spas, delivering precise temperature control and efficient heating performance. Its low flow design ensures compatibility with spa plumbing systems, reducing energy consumption while maintaining consistent warmth. Ideal for replacement or upgrade, this heater supports optimal spa operation and durability. Hot Tub Replacement Parts was HYD26 0807 7S KS replacement part