It would be easy to manually overheat. The next step up from this is a thermostatic radiator valve (or TRV for short). These work in a similar way but have a sensor that can detect the room's air ...

If you want to install a TRV on your old radiators or an existing thermostatic radiator valve has started to leak, it’s worth noting that you can fix it yourself. In fact, knowing how to install a TRV ...

Kohler toilet w/ piston water flush 2 step doesn't flush even at the 1st step, let alone at the holding the handle down for the 2nd step. We woke up to the toilet leaking water into the bowl.