Have 4G WiFi mini but need Ethernet Connection

[K_T_Dale]

I have a 4G Wi-Fi mini as my source of broadband in the house (benefit of living in the sticks!).

I have a new heating system that needs to be connected to the internet through an Ethernet cable. Are there any products out there, like a Wi-Fi extender, that I can use with the mini to get this Ethernet connection?

[Chris_B]

@K_T_Dale  is this a smart thermostat?  If it is these are Wi-Fi enabled and don’t need a Ethernet cable.  
But if you think you have to use one then you can get a WiFi repeater that has a Ethernet port on it.