The mini convection heater market is expected to grow in the coming years due to several factors, including:

1. Energy efficiency: Mini convection heaters are known for their energy efficiency, which is becoming an increasingly important factor for consumers looking to reduce their energy bills and their carbon footprint.

2. Convenience: Mini convection heaters are small and portable, making them ideal for use in small spaces, such as bedrooms, offices, and apartments.
   

3. Safety: Mini convection heaters are generally considered safe to use, with features such as automatic shut-off and overheat protection.

4. Cost-effective: Mini convection heaters are typically more affordable than larger heating systems, making them an attractive option for consumers looking to save money on their heating bills.

5. Technology advancements: With advancements in technology, mini convection heaters are becoming even more efficient and user-friendly, with features such as programmable thermostats and smartphone compatibility.

6. Increasing demand: As the demand for energy-efficient and cost-effective heating solutions continues to rise, the market for mini convection heaters is expected to grow.

Overall, the development prospect for mini convection heaters looks promising, as consumers continue to seek out convenient, cost-effective, and energy-efficient heating solutions.