ACH100 100W 230V Heater, Anti-Condensation, 230 V, 100 W, 70 mm, 67 mm, 191 mm, 2.76 “. The ACH100 series from Pentagon are Anti-condensation heaters. These are vitreous enamelled resistor mounted in a sheet steel case, these heaters are typically used in switch and control gear cubicles.