Auto Heater 3kw - H30-RS1 Hot Tub Spa Fish Koi Pond Temperature Control
LX H30-RS1 Heater with Thermoregulator 3KW. Required flow rate: Set by the pressure switch, this switch will need to be pressurised, if it runs straight to a big bore out let with no bends, there will be no back pressure and it may not work.