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It had occurred that something with smaller holes might help - currently have a big drencher rose installed. But the bath suffers the same problem as the shower (they're both connected to the Grohe Rapido T). I was testing the kitchen tap and the bathroom basin last night and they do both...

The basin flows a little better but is that linked to smaller pipe? The basin will also suffer from loss of hot, but not as readily as shower, again I assume linked to size of pipe.

I have recently had a new thermostatic shower/bath mixer (Grohe rapido T), fitted, which is fed by a Vaillant ecomax boiler (c. 6 or 7 years old). The problem is that the pressure is terrible and the mixer cannot sustain hot water for any length of time. Now i understand that combi boilers...