A 4 in 1 boiling water tap gives you four types of water from one kitchen tap: normal hot, normal cold, filtered boiling water and filtered cold drinking water. It does everything a 3 in 1 tap does, and adds filtered cold water for drinking and cooking, so you no longer need a kettle or a filter jug. Each tap comes with an under-sink tank and carbon filter, with UK-wide delivery and installation available. Prefer hot, cold and boiling only? Compare our 3 in 1 boiling water taps.