Best bet is probably the Mira (or other) Pressure Balanced one. Thermostatic mixers on combis can under some circumstances (mains pressure problems etc) do undesirable things.
Yes you should get a good shower with a 28kW combi, unless the mains pressure/flow is poor.
What's the flow fro the kitchen cold tap, then try the hot tap, then try 2 taps...
thanks for responses.....mains pressure is good , boiler is only 1 year old and in good working order. How risky is going for a plain mixer over a pressure balanced mixer? What are the "undesirable" things they can do under certain circumstances ( and what are the ...certain circumstances) ?! thanks again
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