Cotherm - 1 3/4 3kW Immersion Heater 11 for Unvented Cylinders (No Thermostat) This is a 3kw, 11inch immersed length Incoloy Immersion Heater without thermostat. The element can be used in all standard domestic water areas including normal use in hard water areas susceptible to limescale. If particularly aggressive water conditions are present or the duty/usage is higher than normal we recommend using the 14 titanium version of this element which is available here: Cotherm - 1 3/4 3kW Titanium Immersion Heater 14 for Unvented Cylinders Product Details: Loading KW: 3 kW Voltage: 240v Length: 11 Element diameter: 8mm Sheath material: Incoloy 800 Head size: 1.75 BSP