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Vaillant turbomax combi boiler. Why does it only fire up when the hot water tap is partially open? Why does the 22mm central heating pipe get hot then, even when central heating is switched off and cold? Is there something wrong? Could this be linked to mixer shower controls not getting...

to boost hot water in shower? Keeps cutting out, plumber says no to pump with combi but what about the new Salamander Home boost?

New shower, but concealed therm valve not working. Water turns cold. I've heard about boosting it with a venturi shower valve, should I have installed this instead? Should I do it now? Expensive shower now shunned by whole family because it's cold.

New shower installed, simple round ceiling head, with thermostatic mixer valve. Shower is on top floor of a 3-floor terraced house, where the water pressure has always been low. Combi boiler is being repaired (it's insured - a 15 year old Vaillant Turbomax) - fitter is coming soon for third time...