Description
A concealed dual flush cistern from Grohe’s Adagio range, featuring EcoJoy 6/3L water-saving technology and a flexible side fill inlet that accepts water supply from the left, right, or back. Supplied complete with a round 50mm chrome Starlight push button, 0.5m Bowden cable, fixing brackets, flush pipe, and WC inlet connector — everything needed for a full installation. Acoustic Group I rated for quiet operation. Suitable for walls 18–24mm thick. Minimum 0.2 bar water pressure required.
⚠️ Professional installation recommended. Designed for concealed installation behind wall panels, stud walls, or within bathroom furniture. Side fill inlet accepts supply from left, right, or back. Push button can be positioned front, top, left, or right via the 0.5m Bowden cable.
Key Features
-
Dual flush 6/3L EcoJoy — full or half flush; up to 50% water saving vs single flush systems
-
Side fill inlet — water supply from left, right, or back; ideal for furniture installations and retrofits
-
Chrome push button included — round 50mm Starlight chrome button with eco button; no separate purchase required
-
Flexible button positioning — 0.5m Bowden cable; front, top, left, or right actuation
-
Acoustic Group I — quiet fill and flush operation
-
Wall thickness 18–24mm — suits standard stud wall and furniture panel installations
-
Low pressure compatible — minimum 0.2 bar
-
Complete installation kit included — fixing brackets, flush pipe, WC inlet connector
-
Grohe Starlight chrome finish — multi-layer coating; tarnish and scratch resistant
Side Fill vs Bottom Fill
Choose the side fill model (39054000) when existing pipework enters from the side, or for furniture-mounted WC units where lateral access is easier. Choose the bottom fill model (39053000) for new installations with standard floor-level pipework. Both models deliver identical dual flush 6/3L EcoJoy performance.
Technical Specification
| Brand: |
Grohe |
| Range: |
Adagio |
| Model: |
39054000 |
| Flush type: |
Dual flush — 6L full / 3L half (EcoJoy) |
| Inlet type: |
Side fill — left, right, or back |
| Min. water pressure: |
0.2 bar |
| Acoustic rating: |
Group I (quiet) |
| Push button: |
Round 50mm chrome Starlight — included |
| Button actuation: |
Front, top, left, or right |
| Bowden cable: |
0.5m (included) |
| Wall thickness: |
18–24mm |
| Finish: |
Chrome — Grohe Starlight |
| Country of origin: |
Germany |
What’s Included
- Grohe Adagio concealed cistern (39054000) with side fill inlet
- Round 50mm chrome Starlight push button with eco button
- 0.5m Bowden cable
- Fixing brackets
- Flush pipe
- WC inlet connector
- Installation instructions
Also in the Grohe Adagio Cistern Range
Frequently Asked Questions
Is the push button included with this cistern?
Yes — this cistern is supplied complete with a round 50mm chrome Starlight push button (with eco button) and a 0.5m Bowden cable. No separate button purchase is required, unlike some other Adagio cistern models.
What is the difference between side fill and bottom fill?
The side fill inlet (this model, 39054000) accepts the water supply connection from the left, right, or back of the cistern — useful for furniture installations, retrofits, or where pipework enters from the side. The bottom fill model (39053000) connects from below, which is standard for new builds with floor-level pipework. Flush performance is identical on both.
What wall thickness is this suitable for?
This cistern is designed for walls between 18mm and 24mm thick, covering standard stud wall and bathroom furniture panel constructions.
What is EcoJoy technology?
EcoJoy is Grohe’s dual flush system delivering a 6 litre full flush and a 3 litre half flush. Choosing the half flush for liquid waste reduces water consumption by up to 50% compared to older single-flush cisterns, lowering utility bills and reducing environmental impact without compromising flush performance.
What is Acoustic Group I?
Acoustic Group I is the quietest classification for cistern fill noise under European standards. It means the cistern refills quietly after flushing — particularly important for ensuites, apartments, and bathrooms adjacent to bedrooms.
What is the minimum water pressure required?
A minimum static pressure of 0.2 bar is required, making this cistern compatible with most UK water supplies including properties with lower pressure.
Can I order if the item shows as out of stock?
Yes — this product is available to order even when stock shows as zero. Please allow additional lead time and contact us on 01603 381095 to confirm availability and delivery timescales.
