Balboa Water Group 5.5kW 120/240 volts replacement flo-thru spa heater for M7 dual sensor systems part# 58002. Heater manifold 825 inc stainless steel measures 2" x 15" with two thd taps for the sensor mounts (sensors sold separately), mounting studs and includes heater element rated at 5.5kW, 120/240v. Assembly includes (2) 2" heater split nut union w/gakets and 2" tailpieces. This heater assembly will work with the Balboa 52531 control systems. Balboa heater assembly comes complete with a 1 year warranty. (removal of element voids warranty) Note: To make sure this is the correct heater for your application, please check the Balboa label on your existing heater. If you are unsure where to find the part number please contact us.