Monobloc and separate mixer taps on basins

Monobloc vs Mixer Taps: Which Suits Your Basin or Sink?

A monobloc tap is a type of mixer tap: one body, one spout, one hole in the basin or worktop. What most people mean by “mixer tap” in this comparison is the older style with two separate handles on two or three holes. If your basin has a single tap hole, a monobloc is the natural fit. If it has two holes, you need a bridge mixer, a pair of pillar taps or a hole blanking plate. Below we explain how each works, what to check before you buy, and how wall-mounted and deck-mounted taps fit into the choice.

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TL;DR

  • A monobloc sits in one hole and mixes hot and cold inside the body. Separate mixers and pillar taps need two or three holes.
  • Count your tap holes first. The basin or sink decides the tap type far more than taste does.
  • Mixing hot and cold water is not the same as having them mixed safely: your water pressure and your supply type (mains or tank-fed) decide which tap works well.
  • Deck-mounted taps fit on the basin or worktop. Wall-mounted taps free up the surface but need a planned pipe position in the wall.
  • Every tap in a UK home must meet the water regulations on backflow protection, so keep the air gap between spout and basin rim.

Table of Contents

What each term actually means

Tap names overlap, which is why the search results for this topic are confusing. Here is the simple version.

Monobloc tap. One spout served by the controls on a single body, fitted through one hole. Houzz UK’s tap guide describes monobloc taps as having one spout with connecting handles and needing just one hole. Some have one lever for flow and temperature. Others have two small handles on the same body (a dual-flow design).

Mono mixer. Another name for the same thing. “Mono basin mixer” means a mixer with a single-hole fitting. When a shop says mono mixer, it is selling a monobloc.

Separate mixer tap. Per the same Houzz guide, a mixer has separate hot and cold handles whose water is blended through one spout, and it is fitted separately across two or three holes. Think of a three-hole basin mixer, with the spout in the middle and a handle each side.

Pillar taps. A pair of separate taps, one hot and one cold, each with its own spout and its own hole. Water mixes in the basin, not in the tap. That is why traditional pillar taps can scald with one and freeze with the other.

Tap types compared by bodies and basin holes

Bridge mixer. A useful in-between case. Houzz notes that a bridge mixer mixes hot and cold through one central spout but normally spans two tap holes, so it looks like separate controls but works as a mixer. It is the standard answer for a traditional-style kitchen sink with two holes.

Monobloc vs separate mixer taps: the practical differences

Feature Monobloc Separate or bridge mixer Pillar taps
Tap holes needed One Two or three Two (one each)
Water mixes Inside the tap Before the spout In the basin
Look Compact, modern Traditional or period Traditional
Cleaning Few gaps around the base More joints and bases to wipe Two bases, narrow gap between
Best for Modern basins, single-hole sinks Period bathrooms, two- and three-hole basins Period styling, cold-only cloakrooms

Cleaning and maintenance

Fewer bases mean fewer places for limescale and soap to settle. This is the main day-to-day reason people favour monoblocs. One cartridge, or one pair, also means fewer parts to replace later. Separate mixers have more joints, so more potential drips, but the parts are often simple to swap.

Look and feel

A single lever is easy to use with wet or soapy hands and is a popular choice for family bathrooms. Two-handle designs give a classic character and a precise feel. Neither is better in absolute terms: match the tap to the room.

Flexibility

A monobloc cannot be spread across a wider basin. If your sink is large and you want a long gap between spout and handles, a separate or bridge mixer gives you that layout.

Check your tap holes before anything else

The most common reason a new tap does not fit is a hole mismatch. Many basins have a single hole of about 35mm, which suits a standard monobloc, though basins and sinks vary, so measure your own. The hole size, thread and drill guidance in our tap hole sizes guide covers basins, kitchen sinks and the tails below.

A quick routine:

  1. Look at the basin from above and count the holes.
  2. Measure the diameter of each hole with a tape or callipers.
  3. Check the thickness of the basin or worktop. Thick stone may need long tap tails or a different fixing.
  4. Check the distance between holes if there are two. Bridge mixers are made for set centres.
  5. If the tap needs fewer holes than you have, ask whether a blanking plate is supplied or sold separately.

Don’t forget the other end of the sink. A tap that fits but pairs with the wrong plumbing will cause leaks. Our guide to basin waste size explains the 1¼" (32mm) outlet, and our bottle trap vs P trap guide covers the seal under the basin. If you are also deciding on the basin itself, our ceramic vs resin basin comparison is worth a read.

Water pressure decides which tap works properly

Most mixer problems come from the plumbing behind the tap, not the tap itself.

  • Combi and mains-fed systems deliver at mains pressure. A Book A Builder guide puts this typically at 1 to 3 bar, which suits most modern mixer taps.
  • Gravity-fed systems with a cold water tank often give far lower pressure, around 0.2 to 0.5 bar according to the same guide, and may need taps made for low pressure.
  • Uneven pressure between the hot and cold sides can cause temperature swings and noise, per the same source.

If you have a tank-fed system, look for a tap that states it is suitable for low pressure, and see our vented option below. Unvented or mains-fed supplies work with the widest range of single-lever taps.

A vented tap is built for supplies that do not run at mains pressure, such as a hot water cylinder fed from a loft tank. If you are fitting one under a sink, our monoblock mixer vented tap for Tudor undersink is the kind of product to look at. For a single-lever style that works with a Tudor II unit, see the single lever basin tap for Tudor II.

Wall-mounted vs deck-mounted taps

The other half of the question is where the tap sits.

Deck-mounted taps are fixed to the basin, bath edge or worktop. They are the default because the pipes come up from below and the basin already has a hole. Pillar taps, monoblocs and bridge mixers are all deck-mounted. Installation is straightforward, and swapping later is easy because the pipework is under the basin.

Wall-mounted taps come out of the wall above the basin. The basin needs no tap hole at all (you buy a tap-hole-free basin), and the worktop stays clear, which makes cleaning the surface easier and suits slim or small basins. The trade-offs are that the pipework must be planned before the wall is tiled or boarded, the spout must reach well into the basin to avoid splashing, and any later repair means opening up the wall or a concealed body.

Deck-mounted Wall-mounted
Holes in basin Yes, one to three None
Pipework Under the basin, accessible Inside the wall
Surface space Base sits on the basin or worktop Basin edge stays clear
Retrofit Easy Needs wall work
Splash risk Low, spout over the bowl Depends on spout length and height

In a small room, taps that free up the basin ledge can make a real difference to how the space works. For ideas on planning around fixtures, see these small bathroom layout ideas, and remember that taps, basin and waste must be chosen together with the layout.

UK water regulations: keep the air gap

A basin tap that mixes hot and cold is still a point where drinking-quality water meets a basin that could hold dirty water. UK rules therefore require backflow protection. Water Regs UK explains that domestic bath and basin taps are normally treated as fluid category 3 risks, and that a common way to protect against backflow is a set air gap between the tap outlet and the spill-over level of the basin or bath, sized by pipe diameter.

In practice:

  • Do not choose a tap whose spout sits too low in a shallow basin, or one that can dip below the overflow level.
  • Check the tap’s literature for the correct installation guidance on the type of basin.
  • Avoid hose-style attachments that could sit under water unless the product is designed for that with backflow protection.

The same body also notes that where water is supplied for domestic use, a drinking water tap must be installed, and that it should where possible come directly from the mains, per its drinking water taps page. That is why many homes keep the kitchen tap on mains supply even if the bathroom is tank-fed. So the answer to “does kitchen and bathroom tap water come from the same place?” depends on your system: both usually start as mains water, but a tank-fed bathroom tap may be drawing from storage.

When the job is done, the installation should be pressure tested using the manufacturer’s recommended procedure, as set out in a plumbing technical guide. Check every joint for weeping with the water on, and again after a few hours. If you are unsure about the supply, call a Water Safe registered plumber.

Perspective: how we would choose

We sell washroom, heating and bathroom products to homeowners, facility managers and contractors, and most tap questions we see are really fit questions. People fall for a tap, then find the basin has the wrong number of holes, the waste is the wrong size or the supply is low pressure.

Our advice is plain. If you are fitting a new basin and have a free choice, a monobloc is the easiest to live with: one hole, one fitting, one thing to wipe. If you are replacing a tap on a period basin, match what is there, and use a bridge or separate mixer rather than drilling a ceramic basin. If a commercial washroom needs a controlled, hands-free option, look at sensor or timed designs rather than a lever, which cut waste and shared touch points.

For trade buyers fitting multiple washrooms, we would sort the specification by hole count and supply type before price. A mixed batch is a returns problem waiting to happen.

— Carl

Taps for washrooms and commercial use

In offices, schools and public toilets, a standard lever monobloc is rarely the best option. Automatic mixer taps stop water running when not in use and reduce contact. Our listings include the Easyflow adjustable mixer classic automatic tap, the slanted version and the folded version, each a mixer with adjustable temperature. Check the product page for the current specification before you order.

Which should you choose?

Use these rules of thumb:

  • One tap hole, modern bathroom: monobloc.
  • Two holes, traditional style: bridge mixer or a pair of pillar taps.
  • Three holes: a three-hole basin mixer, or a monobloc with the outer holes blanked.
  • Small basin and a tight room: wall-mounted, if the wall can be opened up for pipework.
  • Tank-fed hot water: a tap rated for low pressure.
  • Busy commercial washroom: an automatic mixer.

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FAQ

Is a monobloc tap the same as a mixer tap?

A monobloc is one kind of mixer tap. It mixes hot and cold inside a single body and uses one hole. When people say mixer tap in contrast with monobloc, they usually mean a separate-handle design on two or three holes.

What is the difference between a mixer tap and pillar taps?

Pillar taps are two separate taps, each delivering only hot or only cold. A mixer blends both through one spout, so you get a usable temperature straight from the tap. Pillar taps suit period styling, while mixers are easier to use day to day.

Can I fit a monobloc on a basin with two tap holes?

Yes, but you will need to cover the second hole with a blanking plate or choose a basin with a single hole. Always measure first, and never drill a ceramic basin yourself. For sizes, see our tap hole guide.

Are wall-mounted taps better than deck-mounted?

Neither is better overall. Wall-mounted taps keep the basin clear and look sleek, but they need pipework planned inside the wall. Deck-mounted taps are simpler to fit and to repair later.

Sources

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