Model vs model
Arno Square 4-in-1
vs Franke Omni
The Arno Square 4-in-1 lists at £499, £700 less than the Franke Omni at £1,199.
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.
The differences at a glance
- The Arno Square 4-in-1 lists at £499, £700 less than the Franke Omni at £1,199.
- The Franke Omni dispenses at 100°C; the Arno Square 4-in-1 tops out at 98°C.
- Declared idle draw is 11 W for the Arno Square 4-in-1 against 12 W for the Franke Omni, which compounds into the standby cost difference below.
- Tank capacity: 4.2 L on the Franke Omni 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 Arno Square 4-in-1 dispenses chilled water; the Franke Omni 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 | Arno Square 4-in-1 | Franke Omni |
|---|---|---|
| UK RRP | £499✓ | £1,199 |
| Boiling temperature | 98°C | 100°C✓ |
| Tank capacity | 2.4 L | 4.2 L |
| Idle power | 11 W✓ | 12 W |
| Peak power | 1500 W | 1500 W |
| Flow rate | - | - |
| Filtered water | Yes | Yes |
| Sparkling water | No | No |
| Chilled water | Yes✓ | No |
| Filter type | 2-stage filter: PP cotton + activated carbon block | Franke 08 filter cartridge |
| Finishes | 4 | 4 |
| Warranty | 3 years | 3 years |
| Released | 2023 | 2023 |
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
Franke Omni
- Idle draw
- 12 W
- Standby energy / year
- 105 kWh
- Standby cost / year
- £28
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
Franke Omni
What we like
- True 100°C confirmed in Trusted Reviews testing
- Built-in filter delivers chilled filtered water without add-on
- Spout body stays cool even during prolonged dispensing
- 4.2L tank larger than most rivals under £1,200
Watch out for
- Filter cartridges cost roughly £80 every 6-9 months
- Owners report flow slowdown after 2 years in hard-water areas
- Heating tank replacement reported at around £400 out of warranty
- Low mains pressure (under 1.5 bar) causes noticeable dribble