Act as a product designer with 10 years of experience in smart home appliances. Create a high-quality, photorealistic image of a [sleek, modern] portable heater featuring advanced room mapping technology. The heater should have a [minimalist, matte black] finish with a subtle LED display showing real-time temperature adjustments. Include visual cues like [dynamic heat waves] radiating from the device to emphasize its efficiency. The background should depict a [cozy, well-lit living room] with furniture arranged to showcase the heater's ability to evenly distribute warmth. Ensure the design highlights key features such as energy-saving modes, app connectivity, and silent operation. Use warm lighting and soft shadows to create an inviting atmosphere.