Hi. I’m after a Webasto smart controller for my thermo top c/e water heater please? I want to be able to remote control it from my phone. the current controller only has a live wire going to it which i assume it just turns heater on when controller calls for heat. My current controller is also powered by batteries. Hope this all makes sense and you can help. Thank you

Webasto have an add on controller to allow smart phone functionality, please initially take a look at web link below

https://www.butlertechnik.com/item/Webasto/ThermoConnect-TCon2-Smartphone-App-Operated-Controller/6H6

Not sure which controller you have currently from your decription, is it a Webasto branded controller? Perhaps send photo to our sales tech support guys sales@butlertechnik.com  of your controller and electrical connections if you are interested to install this

Thanks