The Nasgas DG-10L Crystal is an instant gas water heater engineered for households requiring immediate hot water without tank storage. It features a heavy-copper heat exchanger for better heat transfer and durability. The unit includes auto cut-off protection, automatic ignition (pressure controlled), and a low water pressure startup function, making it usable even with weak water supply. 

To enhance seasonal usability, it has anti-freezing protection and a winter/summer switch. It’s claimed to save up to 40% energy compared to conventional heaters. The body is compact and rust-resistant, and it includes a digital temperature display plus a shower head. 

This model is suitable for bathrooms or small flats where demand is moderate, and where the plumbing allows sufficient gas and water supply. As an instant type, it doesn’t store hot water — water flows through the unit and is heated in real time.