The Helios EDTW is an electronic controller designed for stepless speed regulation of single-phase fans based on differential temperature. It enables continuous fan speed adjustment in response to temperature variations, ensuring efficient and demand-based operation. The controller comes in a durable, impact-resistant white polymer housing and supports both surface and flush mounting. It operates at 230 V~, 50/60 Hz, and is rated IP20 for indoor use. The unit is supplied with two temperature sensors for accurate differential measurement and control.