The LX H30-R2 3.0KW 1.5 inch Without Sensor Cable (L Shaped).
Sensor compatibility: Controlled by the system control box
Required flow rate: Set by pressure switch, this switch will need to be pressurised, if it runs straight to a big bore outlet with no bends, there will be no back pressure and it may not work
Flow detection: Pressure switch built-in
Diameter: 50 mm
This unit replaces the Rooster heater as they kept failing. This heater is longer than the Rooster so you may need to alter the plumbing slightly