Hydro Quip VersiHeat CS9408 5.5kW [13" x 2"] Electric Heater (26 C73 050 0G03) vacalert The large rectangular design gives The large rectangular design gives this panel practical value because some spas are built around a wider topside footprint and a more expansive button layout than compact keypads can offer 6 position applications where the original valve assembly has become worn or unreliable 5 kW electric heater is designed for compatible heating applications where a 13 inch by 2 inch heater assembly is needed An electric heater like this is useful because it provides the direct heating support required by the system while matching the supported VersiHeat CS9408 heater format