Types of Solar Water Heater Systems: Pressurized vs Non-Pressurized

Solar water heater systems are categorized primarily by circulation method (active vs. passive) and heat transfer mechanism (direct vs. indirect). Active systems utilize pumps and controllers for forced circulation, suitable for complex installations and colder climates, while passive systems rely on natural convection for simplicity and reliability. Direct systems circulate potable water through collectors, ideal for frost-free regions, whereas indirect systems use heat transfer fluids with antifreeze properties for cold climates. Sidite's product range encompasses all system types, including integrated collector storage (ICS) systems for tropical areas and drainback systems for regions with occasional freezing. A technological showcase in Greece compared system types, demonstrating that active indirect systems achieved 30% higher efficiency than passive systems in multifamily applications, though passive systems showed lower maintenance requirements. For guidance on selecting the optimal type of solar water heater system for your specific conditions, please contact our engineering team for professional assessment.