Franke Omni

At £1,199 the Franke Omni is the first Quooker alternative to look at for buyers who want a built-in filter without bolting on extras. It is a true 4-in-1: boiling 100°C, filtered cold, and standard mains hot and cold from one tap, with the carbon filter living inside the same compact undersink unit as the boiler.

The standout is the integrated filter. Trusted Reviews found that running the cold supply through it produced a noticeably cleaner taste, which is the practical thing you actually notice day to day in hard-water London or the south-east. The boiler unit itself is silent in use, has no fans or compressor, and is fit-and-forget in the way the brochure claims. Unlike many rivals that quietly settle at 98°C, the Omni does hit a real 100°C boil, so it is honest about its sterilising and tea-making credentials.

Water pressure is the catch. The Omni officially works between 1.5 and 5 bar, but at the lower end the filter visibly slows the flow and the swan-neck can dribble slightly after the lever is released. If your mains pressure is poor, particularly in older terraces or upper-floor flats, an unfiltered tap will feel faster. Filter cartridges also need replacing roughly every six months, which is an ongoing cost that the Quooker 3-in-1s do not impose. Pick the Omni when filtered drinking water is a real requirement, not when it is just a nice-to-have.