Model vs model
Franke Minerva
vs InSinkErator 3N1 J-Shape
The Franke Minerva dispenses at 100°C; the InSinkErator 3N1 J-Shape tops out at 98°C.
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 →The differences at a glance
- The Franke Minerva 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 12 W for the Franke Minerva, which compounds into the standby cost difference below.
- Tank capacity: 4.7 L on the Franke Minerva 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 dispenses filtered drinking water; the Franke Minerva does not.
- The InSinkErator 3N1 J-Shape ships with a 5-year warranty; the Franke Minerva 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 | Franke Minerva | InSinkErator 3N1 J-Shape |
|---|---|---|
| Typical price | £899 | £899 |
| Boiling temperature | 100°C✓ | 98°C |
| Tank capacity | 4.7 L | 2.5 L |
| Idle power | 12 W | 11 W✓ |
| Peak power | 1500 W | 1300 W |
| Flow rate | - | - |
| Filtered water | No | Yes✓ |
| Sparkling water | No | No |
| Chilled water | No | No |
| Filter type | - | - |
| Finishes | 2 | 2 |
| Warranty | 2 years | 5 years✓ |
| Released | 2018 | 2020 |
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.
Franke Minerva
- Idle draw
- 12 W
- Standby energy / year
- 105 kWh
- Standby cost / year
- £28
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
Franke Minerva
What we like
- £899 RRP undercuts most 100°C branded competitors
- 4.7L tank capacity highest in the sub-£900 segment
- Genuine 100°C dispense matches premium models
- M-Box install system fits in under 30 minutes for a plumber
Watch out for
- Review Centre reports flow degradation within first year
- No built-in filter (scale build-up in hard-water areas)
- Customer support email-only, no engineer home visits
- Trustpilot mentions boiler failures near warranty expiry
InSinkErator 3N1 J-Shape
Common questions
Franke Minerva vs InSinkErator 3N1 J-Shape: frequently asked
- What is the difference between the Franke Minerva and the InSinkErator 3N1 J-Shape?
- The Franke Minerva 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 12 W for the Franke Minerva, which compounds into the standby cost difference below. Tank capacity: 4.7 L on the Franke Minerva versus 2.5 L on the InSinkErator 3N1 J-Shape. Bigger tanks serve more cups back to back; smaller tanks take less cupboard space.
- Which is cheaper, the Franke Minerva or the InSinkErator 3N1 J-Shape?
- Both list at the same manufacturer price, £899.
- Which is better for hard water, the Franke Minerva or the InSinkErator 3N1 J-Shape?
- The InSinkErator 3N1 J-Shape has a built-in filter, the better choice in a hard water area: it reduces scale build-up in the tank and improves taste. The Franke Minerva has no built-in filtration, so its tank will scale faster without a separate softener.