Modular Radiator Fan System – DIY Smart Heating Booster (Heizkörperventilator)

🌡 Boost your radiator's efficiency with this fully modular, temperature-controlled fan system!

Are you losing heat to cold spots in your room? This DIY radiator fan system actively circulates warm air from your radiator across the entire room – quietly, automatically, and at a fraction of the cost of commercial alternatives.

✨ Key Features

• Temperature-controlled: fans activate automatically via W1209 thermostat

• Fully modular and scalable – add as many fan modules as your radiator requires

• Designed for standard panel radiators

• No soldering required – simple wiring with connectors

• Printed in PLA & PETG

🛒 Required Components

• 3× SUNON 70×70×25mm 12V DC fan

• 1× W1209 digital thermostat (12V)

• 1× LM2596S DC-DC step-down converter

• 1× 12V 3A power supply + adapter

• 4× Neodymium magnets

🖨 Print Settings

• Material: PLA (structural parts) / PETG (conectors and holders)

• Layer height: 0.2mm

• Infill: 20–30%

• Supports: only for some holders necessary

🔮 Planned Updates

• Printable spacer modules (custom width) to fit different radiator sizes

• Smart home integration for use with intelligent thermostatic valves

⚠ Disclaimer: This project is provided as-is for educational and personal DIY use only. The author accepts no liability for any damage, injury, or malfunction resulting from the use, assembly, or modification of this design. Always ensure proper electrical connections and do not leave unattended during initial testing. This system operates at 12V DC low voltage – however, always follow basic electrical safety practices. Use at your own risk.