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 cannot always keep up with hot water demand and so temperature can waiver, but it wasn't this bad under the old configuration with manual mixer.
My builder assures me that the plumbing is correct and is suggesting that the boiler might have a limescale problem.
But I don't understand why this would suddenly have got so much worse and so am more likely to blame the thermostatic mixer.
As the new mixer only has one flow rate (on/off), could the problem be linked to the above issue re boiler not being able to keep up with demand?
Should i remove the thermostatic mixer and replace with a manual where I can adjust down the flow rate?
Why would the hot water pressure be so much better in the kitchen sink?
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 cannot always keep up with hot water demand and so temperature can waiver, but it wasn't this bad under the old configuration with manual mixer.
My builder assures me that the plumbing is correct and is suggesting that the boiler might have a limescale problem.
But I don't understand why this would suddenly have got so much worse and so am more likely to blame the thermostatic mixer.
As the new mixer only has one flow rate (on/off), could the problem be linked to the above issue re boiler not being able to keep up with demand?
Should i remove the thermostatic mixer and replace with a manual where I can adjust down the flow rate?
Why would the hot water pressure be so much better in the kitchen sink?