Model vs model
InSinkErator 3N1 J-Shape
vs Quooker Flex
The InSinkErator 3N1 J-Shape lists at £899, £351 less than the Quooker Flex at £1,250.
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.
InSinkErator
InSinkErator 3N1 J-Shape
Steaming hot, hot and cold from a slim J-shape spout
Typical price: £899
Full review →
The differences at a glance
- The InSinkErator 3N1 J-Shape lists at £899, £351 less than the Quooker Flex at £1,250.
- The Quooker Flex dispenses at 100°C; the InSinkErator 3N1 J-Shape tops out at 98°C.
- Declared idle draw is 10 W for the Quooker Flex against 11 W for the InSinkErator 3N1 J-Shape, which compounds into the standby cost difference below.
- Tank capacity: 3 L on the Quooker Flex versus 2.5 L on the InSinkErator 3N1 J-Shape. Bigger tanks serve more cups back to back; smaller tanks take less cupboard space.
- The InSinkErator 3N1 J-Shape dispenses filtered drinking water; the Quooker Flex does not.
- The InSinkErator 3N1 J-Shape ships with a 5-year warranty; the Quooker Flex with a 2-year warranty.
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 | InSinkErator 3N1 J-Shape | Quooker Flex |
|---|---|---|
| Typical price | £899✓ | £1,250 |
| Boiling temperature | 98°C | 100°C✓ |
| Tank capacity | 2.5 L | 3 L |
| Idle power | 11 W | 10 W✓ |
| Peak power | 1300 W | 1600 W |
| Flow rate | - | - |
| Filtered water | Yes✓ | No |
| Sparkling water | No | No |
| Chilled water | No | No |
| Filter type | - | Active carbon filter inside the tank |
| Finishes | 2 | 6✓ |
| Warranty | 5 years✓ | 2 years |
| Released | 2020 | 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
InSinkErator 3N1 J-Shape
- Amazon UKCheck price at retailerView ↗
Quooker Flex
No price-checked retailer offers for this model yet. Get a supply + installation quote instead →
Standby energy
What the idle draw adds up to over a year.
InSinkErator 3N1 J-Shape
- Idle draw
- 11 W
- Standby energy / year
- 96 kWh
- Standby cost / year
- £26
Quooker Flex
- Idle draw
- 10 W
- Standby energy / year
- 88 kWh
- Standby cost / year
- £24
Assumes the manufacturer's declared idle wattage around the clock at £0.27/kWh (UK average, mid-2026). Real usage adds the energy to heat the water you actually draw. Run your own numbers in the running cost calculator.
Strengths and trade-offs
InSinkErator 3N1 J-Shape
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