XUELILI Smart Immersion Heater Timer Switch, 2.4Ghz WiFi Water Heater Switch, Smart Wall Touch Boiler Switch with Timer Works with Alexa, Google Home, IFTTT and Smart Life APP, White, 20A, 4400W :
Terma Wifi Timer & Fused Spur - Just Radiators
You won't ever forget to turn off the immersion with this device*
Universal WiFi Socket Box Switch Immersion Heater Control Timer Smart App x 2 | eBay
Smart WiFi Water Heater Switch Boiler Switches,Voice Remote Control Touch Switch,APP Control Timer Water Heater Switch,Neutral Wire Needed,Compatible with Alexa and Google Home(EU Standard) : Amazon.co.uk: DIY & Tools
Tesla T-Smart Smart Retrofit Kit For Immersion Heaters (TIHTS)
HBN WiFi Smart Wall Timer Switch, Compatible with Alexa and Google Assistant, No Hub Required, APP Remote Control, Control Your Devices from Anywhere 13 amp 3120 watts (1 Pack) : Amazon.co.uk: DIY