An acquaintance of mine has a new build with a woodburner feeding a second secondary coil in his DHW tank.
He currently goes upstairs to check the tank temperature (via two thermocouple / thermostat pockets) as a guide to how much wood to add to the woodburner.
He'd like a temperature indication downstairs but there isn't an easy run for wires so he asked me if there was a wireless option.
I guess the tank may reach temperatures too high for the thermistors used in "weather station" and "greenhouse" devices but I see there are a number of bluetooth devices for cooking / smoking / barbecues which should be fine. They tend to be battery powered and not suitable for leaving on all the time.
Any suggestions or any other options? I assume he has a smartphone, but the "cooking" devices often have a base station with a display, also some can do two or more channels.
I also have a slight interest myself, I have some wired thermometers on the CH but it would be quite nice to have them logged.
TIA