Model vs model
Arno Square 4-in-1
vs Franke Mythos Water Hub 6-in-1
The Arno Square 4-in-1 lists at £499, £2,426 less than the Franke Mythos Water Hub 6-in-1 at £2,925.
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.
Franke
Franke Mythos Water Hub 6-in-1
Hot, cold, filtered, chilled, sparkling and boiling from one spout
UK RRP: £2,925
Full review →The differences at a glance
- The Arno Square 4-in-1 lists at £499, £2,426 less than the Franke Mythos Water Hub 6-in-1 at £2,925.
- Declared idle draw is 11 W for the Arno Square 4-in-1 against 25 W for the Franke Mythos Water Hub 6-in-1, which compounds into the standby cost difference below.
- Tank capacity: 4 L on the Franke Mythos Water Hub 6-in-1 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 Franke Mythos Water Hub 6-in-1 dispenses sparkling water; the Arno Square 4-in-1 does not.
- The Arno Square 4-in-1 ships with a 3-year warranty; the Franke Mythos Water Hub 6-in-1 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 | Arno Square 4-in-1 | Franke Mythos Water Hub 6-in-1 |
|---|---|---|
| UK RRP | £499✓ | £2,925 |
| Boiling temperature | 98°C | 98°C |
| Tank capacity | 2.4 L | 4 L |
| Idle power | 11 W✓ | 25 W |
| Peak power | 1500 W | 2200 W |
| Flow rate | - | 2 L/min |
| Filtered water | Yes | Yes |
| Sparkling water | No | Yes✓ |
| Chilled water | Yes | Yes |
| Filter type | 2-stage filter: PP cotton + activated carbon block | Pro M Connect: active carbon + ion-exchange resin |
| Finishes | 4 | 4 |
| Warranty | 3 years✓ | 2 years |
| Released | 2023 | 2022 |
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 Mythos Water Hub 6-in-1
- Idle draw
- 25 W
- Standby energy / year
- 219 kWh
- Standby cost / year
- £59
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 Mythos Water Hub 6-in-1
What we like
- Six functions from one tap: boiling, chilled, ambient and sparkling plus hot and cold mains
- All-in-one under-sink unit houses boiler, chiller, CO2 bottle and filter
- 12-month filter interval with built-in RFID replacement reminder
- Pro M Connect filter adds ion-exchange limescale protection
Watch out for
- Sparkling capacity is 0.6 litres per fill, with a CO2 cylinder to replace
- Spout swivel is limited to 180 degrees
- Personalised settings need the Franke Home App
- Two-year warranty