The Helios EHR‑R 1,2÷125 is a closed tubular steel heating element designed for installation in standard duct systems. It features a tubular casing with a plenum box made from durable aluzinc-coated steel. The heater operates with a low surface temperature for safety and includes both an automatically resetting temperature limiter (trigger at 50 °C) and a manually resettable temperature limiter (trigger at 100 °C), ensuring reliable protection against overheating. This electric heater is suitable for efficient and safe heating within ventilation ductwork.