Immersion heaters on standard flanges TBK / HTBK Flanged immersion heaters with withdrawable elements TBRDH Oil and fuel oil heaters* Light to médium grade oil / fuel oil TBK / HTBK range flange sizes DN80 / DN100 / DN125 • Immersion heaters for heating oil • Standard flanges: PN16 • 11mm dia, incoloy 800 elements brazed to flange • Watt density: 1.9W/cm2 • Built-in thermostat pocket • Polyamide IP66 terminal enclosure with 360º positioning Fitted directly to flange (TBK) or stood off (HTBK), depending on operating temperature • Supply voltage: 400V 3ph