The 200 LPD ETC GLC Solar Water Heater is sized for mid-sized families who need consistent hot water throughout the day. Sixteen evacuated tubes give it a larger solar-absorption surface than the 100 LPD unit, so it heats a bigger daily volume even on moderately cloudy days. The Glass-Lined Coated tank keeps corrosion at bay over years of use, and the system's non-pressure design keeps installation straightforward on most terraces. It's the size our customers choose most often, striking a balance between capacity, footprint, and value.