Model vs model
Arno Square 4-in-1
vs InSinkErator 3N1 J-Shape
The Arno Square 4-in-1 lists at £499, £400 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 Arno Square 4-in-1 lists at £499, £400 less than the InSinkErator 3N1 J-Shape at £899.
- Tank capacity: 2.5 L on the InSinkErator 3N1 J-Shape versus 2.4 L on the Arno Square 4-in-1. 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 Arno Square 4-in-1 with a 3-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 | Arno Square 4-in-1 | InSinkErator 3N1 J-Shape |
|---|---|---|
| Typical price | £499✓ | £899 |
| Boiling temperature | 98°C | 98°C |
| Tank capacity | 2.4 L | 2.5 L |
| Idle power | 11 W | 11 W |
| Peak power | 1500 W | 1300 W |
| Flow rate | - | - |
| Filtered water | Yes | Yes |
| Sparkling water | No | No |
| Chilled water | No | No |
| Filter type | 2-stage filter: PP cotton + activated carbon block | - |
| Finishes | 4✓ | 2 |
| Warranty | 3 years | 5 years✓ |
| Released | 2023 | 2020 |
Standby energy
What the idle draw adds up to over a year.
Arno Square 4-in-1
- Idle draw
- 11 W
- Standby energy / year
- 96 kWh
- Standby cost / year
- £26
InSinkErator 3N1 J-Shape
- 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
Arno Square 4-in-1
What we like
- £499 RRP delivers 4-in-1 cheaper than most rivals
- 2-stage filtration removes chlorine and heavy metals
- 360° swivel spout handles pot-filling and rinsing
- Child-safe spring-loaded boiling dispense as standard
Watch out for
- 98°C ceiling not true 100°C boiling
- 2.4L tank yields only 7-8 cups before recovery
- Limited independent reviews outside Arno marketing
- Newer brand lacks long-term UK reliability track record