Z-Wave is a wireless communication protocol that operates on a different frequency band than Wi-Fi. Specifically, Z-wave operates on the sub-GHz band (between 850-950 MHz) while Wi-Fi operates on the 2.4 GHz or 5 GHz bands.
The lower frequency used by Z-wave enables it to penetrate walls and other obstacles more easily than Wi-Fi. This means that Z-wave devices can transmit signals over longer distances and through more solid materials. The series 800 Z-wave has tested to reach the distance of 100 m and more outdoors.
Additionally, Z-wave devices often use mesh networking, which means that each device acts as a signal repeater, further extending the range of the network.
Therefore, Z-wave devices are more suitable for home automation applications, where long-range communication and reliability are essential.