Water Heater Control Bundle — switch it safely, and see what it costs

Pow Elite R3 bigger version comes with an LCD screen and 20A relay, and of course, a built-in power meter.
6 months of power consumption data (by hour) is stored in eWeLink cloud. As part of the Overload Protection feature, you may set a threshold for power, current, and voltage.
Mobile Phone APP support: ewelink
Input / Output Voltage: 100-240V AC
Maximum Load: 20A
Working Temperature: -10°C to 40°C
Connectivity: WiFi (IEEE 802.11 b/g/n) 2.4GHz
Screen: Clear LCD displays power, current, voltage, and cumulative energy consumption
Data Logging: Stores up to 6 months of hourly power consumption data, exportable to Excel

Lighting, heating, ventilation, roller blinds, sanitary hot water
Mechanical ventilation systems, etc.
Load-shedding of non-priority circuits
Brand  TONGOU