The water heats up instantly as it flows through the device. There is no waiting time, as is the case with traditional water heaters.

Connection to gas supply, adequate ventilation to prevent accumulation of smoke or gas, and connection to plumbing required. It is important that installation is performed by a certified technician to ensure safety and regulatory compliance.

Disadvantages may include the need for proper ventilation and the potential risk of gas leaks, although modern devices have safety valves and systems to detect and prevent gas leaks.

Typically, electric water heaters are designed to supply hot water to specific locations (eg, sinks, showers). To cover the whole house, you will need either a larger model or multiple devices in different places.