We built this 400V halogen heater for attics—those tight, awkward spaces where you just need compact, directional warmth without tearing into the building’s wiring. It’s an infrared quartz tube heater, designed to pack a lot of heat into a very small footprint. Here’s the thing about power and size. It runs on 400V, so you can pull serious wattage off a standard industrial supply without having to run oversized copper everywhere. The unit is just 300mm long, which keeps it slim enough to slip into spots where bulky convection heaters simply won’t fit. And it heats fast. 2500W means you feel the temperature rise quickly. But—this matters—make sure your attic has proper ventilation and thermal management. Without good airflow, the insulation and nearby materials can really take a beating. Inside, the halogen element sits in a quartz tube. That combo keeps the output steady over time and handles the on-off cycling without burning out suddenly. The inner surface has a reflective coating, too, which pushes more infrared energy forward so the heat goes where you aim it. Wiring is straightforward. It uses an R7s connector, which drops right into common tubular heater sockets. So you can get it wired quickly and keep the installation clean—something you can actually service later if you need to. Now, attics are tricky. You’re battling cold floors, moisture, and uneven temperatures. This heater throws heat exactly where you point it, warming surfaces and air locally, which eases the load on your main HVAC. It won’t heat the whole house, but it gives you targeted warmth exactly where you need it, with a fast response and a simple mount. Just plan your clearances and mount it on a stable surface. That way it stays secure, even with vibration and thermal expansion.