Model vs model
InSinkErator 3N1 J-Shape
vs Qettle Signature
The Qettle Signature lists at £795, £104 less than the InSinkErator 3N1 J-Shape at £899.
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.
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 Qettle Signature lists at £795, £104 less than the InSinkErator 3N1 J-Shape at £899.
- The Qettle Signature dispenses at 100°C; the InSinkErator 3N1 J-Shape tops out at 98°C.
- Tank capacity: 2.5 L on the InSinkErator 3N1 J-Shape versus 2 L on the Qettle Signature. Bigger tanks serve more cups back to back; smaller tanks take less cupboard space.
- The InSinkErator 3N1 J-Shape ships with a 5-year warranty; the Qettle Signature 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 | Qettle Signature |
|---|---|---|
| Typical price | £899 | £795✓ |
| Boiling temperature | 98°C | 100°C✓ |
| Tank capacity | 2.5 L | 2 L |
| Idle power | 11 W | 11 W |
| Peak power | 1300 W | 1300 W |
| Flow rate | - | - |
| Filtered water | Yes | Yes |
| Sparkling water | No | No |
| Chilled water | No | No |
| Filter type | - | Q08 extruded carbon block cartridge |
| Finishes | 2 | 3✓ |
| Warranty | 5 years✓ | 2 years |
| Released | 2020 | 2023 |
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
Qettle Signature
- Idle draw
- 11 W
- Standby energy / year
- 96 kWh
- Standby cost / year
- £26
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
Qettle Signature
What we like
- Compact 2L tank fits tighter under-sink cabinets
- Hits 100°C boiling matching premium-brand temperatures
- £795 entry into Qettle's marine-grade Signature line
- Trustpilot reviewers cite responsive UK customer service
Watch out for
- 2L tank delivers only 4 mugs per fill in practice
- Some users note aggressive water release on dispense
- Handle can slip into filter mode accidentally
- Same 2-year warranty inherits Original reliability concerns