Model vs model
InSinkErator 3N1 J-Shape
vs Qettle Signature Modern 4-in-1 (4L)
The Qettle Signature Modern 4-in-1 (4L) lists at £870, £29 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.
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 →
Qettle
Qettle Signature Modern 4-in-1 (4L)
Square-spout 100°C boiling tap in marine-grade stainless steel
Typical price: £870
Full review →The differences at a glance
- The Qettle Signature Modern 4-in-1 (4L) lists at £870, £29 less than the InSinkErator 3N1 J-Shape at £899.
- The Qettle Signature Modern 4-in-1 (4L) dispenses at 100°C; the InSinkErator 3N1 J-Shape tops out at 98°C.
- Declared idle draw is 11 W for the InSinkErator 3N1 J-Shape against 14 W for the Qettle Signature Modern 4-in-1 (4L), which compounds into the standby cost difference below.
- Tank capacity: 4 L on the Qettle Signature Modern 4-in-1 (4L) 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 ships with a 5-year warranty; the Qettle Signature Modern 4-in-1 (4L) with a 2-year warranty.
The two taps in a kitchen
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 Modern 4-in-1 (4L) |
|---|---|---|
| Typical price | £899 | £870✓ |
| Boiling temperature | 98°C | 100°C✓ |
| Tank capacity | 2.5 L | 4 L |
| Idle power | 11 W✓ | 14 W |
| Peak power | 1300 W | 1500 W |
| Flow rate | - | - |
| Filtered water | Yes | Yes |
| Sparkling water | No | No |
| Chilled water | No | No |
| Filter type | - | Q08 extruded carbon block cartridge |
| Finishes | 2 | 5✓ |
| Warranty | 5 years✓ | 2 years |
| Released | 2020 | 2021 |
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
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 Modern 4-in-1 (4L)
- Idle draw
- 14 W
- Standby energy / year
- 123 kWh
- Standby cost / year
- £33
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 Modern 4-in-1 (4L)
What we like
- 4-litre tank serves up to 8 cups in one go
- Marine-grade stainless steel tap, engineered in the UK
- Two-stage child safety: button and turn before boiling water flows
- Choice of round or square spout in stainless, PVD colour or etched finishes
Watch out for
- 17.5-minute initial heat-up and 10-minute recovery after a full tank
- Standard kit does not include a pressure reducing valve
- Two-year warranty