
Grohe Grohtherm 1000 New thermostatic bath mixer

Grohe Grohtherm 1000 New thermostatic bath mixer
I installed it, but when you shower with the "Eco" it makes a stupid noise. Is this a sign of a defect? Is it worth replacing it? If the noise is normal (heard throughout the house), then I'd rather return it and not try another one.
4 years ago