The 38 °C stop is a detent, not a safety device · review
GROHE Precision Flow thermostatic shower mixer with EcoButton review
A thermostat built around a flow-limiting button you press to release full flow — and a water-saving claim published as a percentage with nothing behind it.
The bottom line The mechanism is the right way round — economical by default, full flow on request. The headline percentage behind it means nothing without a figure.
What you are getting
A chrome thermostatic shower mixer with a named TurboStat cartridge, a 38 °C detent, EcoJoy flow limiting released by a button on the handle, S-connections and metal rosettes.
The design decision worth paying for
The saving is the default. Flow is limited unless you press the button for full flow. Most water-saving features work the other way round — an option you have to choose — and those get chosen once.
The claim to discount
“Up to 50 %.” No litres per minute, no reference pressure, no statement of what it is 50 % less than. Reported as a claim; not repeated as a fact.
The cartridge is named, and that matters
TurboStat. A named cartridge is a part number, and a part number is a repair ten years from now rather than a new mixer. Most listings in this hub say only “thermostatic cartridge”.
The 38 °C stop
A detent — a mechanical stop, released by a button. It is not a scald-prevention device, and where genuine scald prevention is required a thermostatic mixing valve specified for the job is what provides it.
Availability
On sale from 96 € to 123 € on the German, French, Italian and Spanish Amazon stores at the time of checking.
Also on sale on the American and British Amazon stores, in the local currency: the range above is measured on the euro stores only.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on 5 September 2026. The live price is at the top of the page.
What we like, and what we don't
Strengths
Names the thermostatic cartridge — TurboStat — which almost nothing else in this hub does
Flow is limited by default and released by a button, so the saving happens without anyone remembering it
S-connections and metal rather than plastic rosettes supplied, in plastic-free packaging
Compromises
The "up to 50 %" saving is a percentage with no litres-per-minute figure and no reference to compare against
No centre distance, no outlet count and no minimum operating pressure
A flow-limited default is a compromise some people simply press past every single shower
Specifications
Centre distance
Not stated by the maker — S-connections and metal rosettes are supplied
Minimum operating pressure
Not stated in this listing
Temperature stop
38 °C detent — stated
Cartridge
TurboStat thermostatic cartridge, stated to hold the set temperature constant
Outlets
Not stated by the maker
Finish
Chrome, with metal rosettes supplied — stated
Amazon reference
B09GPN85QW (same reference on 6 Amazon marketplaces)
EAN
4005176728631
Questions people actually ask
Is the 50 % water saving real?
It is a claim without a reference: no litres per minute, no pressure, and no statement of what the comparison is against. What is real and useful is the mechanism — flow is limited unless you press a button, so the default is the economical one.
What does naming the cartridge buy me?
Availability. A named cartridge is a part number that can still be ordered in ten years, which is the difference between a thermostat that gets repaired and one that gets replaced.
Shower thermostat · 150 mm ±12 centres · G1/2 DN15 · SafetyStop 40 °C · EcoStop 10 l/min first position · silencer fitted
A thermostat that publishes its centre distance with a tolerance, its limited flow in litres per minute, and a built-in silencer — three things nothing else on this page states.
Best for: An existing wall installation whose centres are close to but not exactly 150 mm, in a bathroom where shower noise carries.
