Model vs model
Grohe Red Duo L-Size
vs Quooker Flex
The Quooker Flex lists at £1,250, £375 less than the Grohe Red Duo L-Size at £1,625.
Every number below comes from the manufacturers' own specification sheets. We highlight which tap leads on each spec; what matters most for your kitchen is your call.
For either tap. Free and no obligation.
Grohe
Grohe Red Duo L-Size
99°C filtered boiling water plus a full hot-and-cold mixer
Typical price: £1,625
Full review →
The differences at a glance
- The Quooker Flex lists at £1,250, £375 less than the Grohe Red Duo L-Size at £1,625.
- The Quooker Flex dispenses at 100°C; the Grohe Red Duo L-Size tops out at 99°C.
- Tank capacity: 5.5 L on the Grohe Red Duo L-Size versus 3 L on the Quooker Flex. Bigger tanks serve more cups back to back; smaller tanks take less cupboard space.
- The Grohe Red Duo L-Size dispenses filtered drinking water; the Quooker Flex does not.
Full specification, side by side
Sourced from manufacturer datasheets. A tick marks the better number on specs where more or less is objectively better.
| Spec | Grohe Red Duo L-Size | Quooker Flex |
|---|---|---|
| Typical price | £1,625 | £1,250✓ |
| Boiling temperature | 99°C | 100°C✓ |
| Tank capacity | 5.5 L | 3 L |
| Idle power | - | 10 W |
| Peak power | 2100 W | 1600 W |
| Flow rate | - | - |
| Filtered water | Yes✓ | No |
| Sparkling water | No | No |
| Chilled water | No | No |
| Filter type | BWT active carbon | Active carbon filter inside the tank |
| Finishes | 2 | 6✓ |
| Warranty | 2 years | 2 years |
| Released | - | 2023 |
Where to buy
Checked manually and dated; the retailer's page is always the live source. Affiliate links, disclosed as such. Commission never changes our comparisons. How affiliate links work here
Grohe Red Duo L-Size
- Amazon UKCheck price at retailerView ↗
Quooker Flex
No price-checked retailer offers for this model yet. Get a supply + installation quote instead →
Strengths and trade-offs
Grohe Red Duo L-Size
What we like
- Boiling, filtered and a full hot-and-cold mixer in one tap, no second tap hole
- Large 5.5L boiling reserve (7L total) on the L-size boiler
- Child-safe touch-button dispensing with ChildLock as standard
- Sells around £1,625 at UK specialists, far below the £2,578 list price
Watch out for
- 99°C dispense, not a true 100°C boil (despite Grohe’s "100°C" marketing)
- At around £1,625 it is still a premium tap, though far below its £2,578 list
- BWT filter must be changed yearly or every ~600L, an ongoing cost
- Standard guarantee is 2 years (3 only with registration), shorter than InSinkErator or Franke
Quooker Flex
What we like
- Pull-out hose rinses sinks plus full 100°C boiling
- Same vacuum-insulated tank delivers true boiling water
- Magnetic dock returns hose neatly after use
- Boiling flow auto-locks when hose is detached from base
Watch out for
- £1,250 RRP matches Fusion despite extra moving parts
- Trustpilot owners report hose fraying within several years
- Hose replacement is a paid call-out, not 5-min DIY
- Requires 500mm depth + 200mm width clear undersink space