What to check before buying a boiling water tap

The real difference between models is how many functions the tap actually combines. A 3-in-1 tap gives boiling, mains hot and mains cold from one spout, while a 4-in-1 tap adds filtered cold water too, useful if you already buy bottled or filtered water regularly.

Some boiling water taps only dispense boiling water, so you keep your normal kitchen tap alongside them and need a second tap hole. A 3-in-1 or 4-in-1 tap replaces your kitchen tap completely, which is simpler if you only have one hole and don't want to drill the worktop or sink.

Who a boiling water tap suits

These taps make the most sense in a busy kitchen where the kettle goes on many times a day, or where worktop space is tight and losing the kettle frees up room. For a household that makes two cups of tea a day, the extra cost is much harder to justify.

If you have young children, look closely at the safety handle. Most boiling water taps need a push-and-turn or two-step action before boiling water flows, and an insulated spout that stays cool to the touch is worth checking for too.

Tank size and recovery time

Tank size determines how much boiling water is available before it needs to reheat. A smaller tank suits a household that makes tea and coffee occasionally, while a larger tank copes better with a busy kitchen making multiple hot drinks back to back. Check the manufacturer's stated recovery time, not just the tank's litre rating, since a slow-recovering large tank can be worse in practice than a fast-recovering small one.

Measure these before you order

The tank and filter both live in the cupboard under the sink, so measure the space you have, including around any waste pipes, water softener or bin. Check the tap's hole size against your sink or worktop too, and confirm there's power within reach of where the tank will sit.

Warranty and servicing

The tank and heating element are the expensive parts, so check how long the warranty covers them rather than just the tap itself, and whether you need to register the product to get the full term. It also helps to know whether the brand offers spare parts and servicing in the UK, since a boiling water tap is a much bigger investment than a standard mixer.

Running costs

A boiling water tap has two ongoing costs: the electricity to keep the tank hot, and replacement filter cartridges. Filter prices and replacement intervals vary a lot between brands, and filters need changing more often in a hard water area, so check both before you commit rather than comparing on the tap price alone. Our hard water buying guide explains why limescale matters so much for anything that heats water.

Common boiling water tap mistakes

Every unit needs a dedicated electrical spur alongside the plumbing work, so budget for an electrician as well as a plumber. Forgetting that is the most common reason an installation costs more than expected.

The other mistake is paying for a 4-in-1 tap when you'd never use the filtered water, since the filter is where most of the ongoing cost sits. Our boiling water and filtered taps guide covers running costs and whether one is worth it for your household.