Understanding High-Level vs. Low-Level Heat Pumps: Placement Tips for Optimal Performance. In this video, we break down the key differences between high-level and low-level heat pumps, with a special focus on correctly positioning antifreeze valves to keep your system running smoothly. Detailed visuals guide you through identifying your setup and ensuring the antifreeze valve is placed at the system’s lowest point for maximum efficiency. Check it out, and let us know if you have questions at info@primarypro.co.uk!