The Nasgas SEM-150 is a semi-instant electric geyser engineered to deliver hot water on demand without needing a large storage tank. With a rated maximum power of 2,000 W and support for 15 liters per minute flow, it’s ideal for households needing immediate hot water supply. 

Built with safety in mind, the SEM-150 includes dry heating protection (triggered at ~85 °C), overheating protection, pressure safety valve (0.8 MPa), and earthing protection. The working pressure is rated for 0.8 MPa, which suits many urban plumbing systems. 

The unit has a plastic body design to reduce corrosion, while the internal tank is built to withstand thermal stresses. It also features over-pressure protection and a waterproof design (IPX4 rating in some listings). Users highlight its “special heavy gauge tank” and overall robust build in vendor descriptions. 

In practice, the SEM-150 balances performance and safety, making it a solid option for homes with moderate hot water demand, especially where full storage geysers might be overkill.