Type of product: Heater assembly Make and Model: Spa Power Power: Volts:230 Hz:50 KW: 3.5 Specification Required flow rate:21gpm Flow detection:Built into heater Compatible with: Spa Power SP1200 Connections / Fixings: Usually held in with a double metal brace. 2 inches white plastic female sockets to connect to plumbing Additional notes: Includes complete with heater tube, water sensor, thermal overload sensor Comes complete with in-heater temp sensor SP1200 replacement heater 3.5kw