TuYa Smart WiFi Thermostat Temperature Controller for Water/Electric Floor Heating /Gas Boile Works with Alexa Google Home WZX7H-GA is for water heating; WZX7H-GB is for electrical heating; WZX7H-GC is for water/gas boiler; APP: Tuya / Smart Life Electric heating has exterior sensor , Water heating and Gas boiler heating with out exterior sensor. Package involves 1 X thermostat 2 X screws 1 X English user guide 1 X three meters outdoors sensor (Only GB WiFi included) Note: GA(water heating) and GC(gas boiler) don't have 3 meters outdoors sensor Installation Notes: Please verify that this product is acceptable on your heating equipment earlier than installation; Be sure to hold the flexibility off earlier than installation or maintenance; Please strictly persist with the wiring diagram for wiring installation; Please verify that the fastener is suitable for this product when installing to the wall; Do not pull the cable hard, otherwise the product could also be damaged; If a hard plastic twine is used in the set up process, it should be bent to a suitable angle in advance; Please arrange reputable installation; Please contact the after-sales service for equipment failure, please do not try to fix it yourself; After installation, please investigate this instruction manual again to ensure steady and safe use, and maintain this guide properly