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You wouldn't expect the boiler to do the temperature regulation (other than a very broad bush setting for all the water that comes out). Your taps should be mixing hot and cold water to get the right temperature.
The thermostatic valve ensures that it always comes out at the correct temperature if the supply changes (someone flushes the toilet for instance) but a normal mixer should still control the temperature.
Plumbing! My new (gas) boiler works in such a way that when i open the taps (mixer) it's either on and hot, or off an cold - there's no in-between/regulation tap-side.
Is this likely due to not having a thermostatic valve in the taps?
Or is this inherent to a certain kind of boiler (this one, it's in Polish, sorry)