Single Lever vs. Double Lever Faucet – Which is the Better Choice
Single-lever vs. double-lever faucet – which is the better choice for your bathroom space?
When a customer comes to a bathroom studio or browses an e-shop and is faced with the choice of a water faucet, one of the first questions they ask is: should I buy a single-lever or a double-lever faucet? At first glance, it looks like a simple aesthetic choice. In reality, it is a technical decision that will affect the comfort of operation, water and energy consumption, ease of maintenance and the overall lifespan of the installation. From practice, I know that people underestimate this difference and then return with dissatisfaction – either with comfort, or with sealing, or with the cost of repair after a few years.
In this article, we will thoroughly examine both types – from the principle of operation through the cartridge mechanics, flow and mixing, to specific scenarios where each type makes more sense. We will also go through common mistakes in selection and tips on what to watch for during installation. If you are looking for a more comprehensive view of the entire faucet selection, see the article How to choose Schütte water faucets – what to pay attention to in our Knowledge Center.
Basic principle of operation – what is hidden inside
Before we compare both types, it is important to understand what physically happens inside the faucet when you turn the lever or handle. The entire principle of a water faucet is about opening, closing or mixing the flow of cold and hot water from two inlets and delivering the result through the outlet or shower connection.
Single-lever faucet – the cartridge as the heart of the system
A single-lever faucet has only one lever that controls two things at once: moving sideways mixes hot and cold water, moving up and down regulates the flow (opening and closing). This is made possible by a ceramic cartridge – a disc with two ceramic plates, each with precisely aligned holes so that mutual rotation and sliding change the mixing ratio and overall opening. Ceramic is hard, smooth and practically requires no lubrication – hence the long lifespan with proper water and cartridge quality.
Cartridges are produced in standardized diameters – most commonly 25 mm, 35 mm and 40 mm. A larger cartridge diameter usually means a higher flow and longer lifespan, as the ceramic surfaces are less loaded. Schütte faucets typically use 35 mm cartridges, which is today's golden standard for sink and shower faucets. More about cartridge replacement can be found in the article Replacing seals and cartridges in Schütte faucets – procedure and tips.
Double-lever faucet – two handles, two valve inserts
A double-lever faucet has two separate control elements – usually two round handles or two levers – one for cold, one for hot water. Each handle controls its own valve insert (valve), which is either an older rubber-ceramic type or a modern ceramic insert. Mixing occurs either in the body of the faucet or directly in the outlet, where both flows are combined.
Double-lever faucets with ceramic inserts are today more reliable than the old rubber-ceramic valve faucets, where the rubber hardened over time, cracked and caused dripping. Due to this history, double-lever faucets have an unfairly bad reputation with some people – modern versions with ceramic inserts have eliminated it.
Control and comfort of daily use
From the perspective of practical use, the difference between the two types is significant. A single-lever faucet allows operation with one hand – you lift the lever and water flows, you turn sideways and set the temperature. This is a huge advantage when you have your hands full of soap, you are carrying a child, or you simply want to quickly wash your hands without unnecessary dancing around the cabinet. In the kitchen, it is even more pronounced.
A two-handle faucet requires both hands, or at least coordinated movements – one to open the cold water and the other to adjust the hot. It's nothing complicated, but during the morning rush, when you're half-awake, it can be annoying. On the other hand, once you set your preferred temperature on a two-handle faucet, you usually don't need to adjust it every day – the water always flows at the same temperature.
Water and energy savings – an underestimated aspect
A single-handle faucet is a bit tricky in terms of consumption, precisely because people have gotten used to lifting the handle straight to the center (neutral position) without thinking. In the middle, the temperature is mixed 50:50 – both hot and cold water flow at the same time, even though pure cold water would be enough. According to various studies on consumer behavior, up to 70% of people unknowingly heat water they don't actually need during short uses (hand washing for up to 10 seconds). A thermally reliable water heater or tank unnecessarily covers this side of energy consumption.
A two-handle faucet doesn't have this problem – you control the cold water separately, and the hot water separately as well. If you want cold water, you open only the left (or marked) handle. No "accidental" hot water. From this perspective, a two-handle faucet is more economically interesting in a household with a low-capacity TÚV tank (100–150 liters) and electric heating.
Technical reliability and lifespan
This is a topic where opinions vary, but the facts are quite clear. A modern single-handle faucet with a quality ceramic cartridge (diameter 35 mm, manufacturer e.g. Kerox, Sedal or Heimeier) has a lifespan of 15–20 years under standard water quality, provided the faucet is not exposed to significant impurities. The cartridge is compact, replaceable, and nowadays it's relatively cheap – typically 5–25 € depending on the diameter and manufacturer.
A two-handle faucet with ceramic inserts is similarly reliable – the insert (seal) wears out more slowly than the old rubber seals, and when there's a problem, you only replace one of the two inserts. In practice, this can be more advantageous – if hot water starts dripping, you only address the right side, not the entire faucet. With a single-handle faucet, when the cartridge is worn out, you replace the entire cartridge at once (although this is not a disadvantage – one replacement resolves the entire issue).
From the perspective of pressure and flow, it's important to know: a 35 mm single-handle cartridge allows a standard flow of 10–15 l/min at 3 bar pressure, while a two-handle faucet with two inserts may be slightly flow-limited due to the construction if the inserts are not properly seated. In practice, the difference is minimal when the faucet is properly chosen.
The graph is illustrative – in real practice, the differences depend primarily on the quality of the chosen faucet, not the type. A cheap single-handle faucet with a plastic cartridge will not last as long as a well-maintained two-handle faucet from a reputable manufacturer. More on this, where the reasonable investment limit lies, you will find in the article Schütte vs. other brands – is it worth paying more for a quality faucet.
Where each type fits – specific practical scenarios
Bathroom sink
This is the classic case. Most customers automatically reach for a single-handle faucet here, and in most cases, it's the right choice. In the morning, after lunch, in the evening – quick hand washing, teeth cleaning, morning hygiene. A single-handle faucet is fast and convenient, and if you have a limiting cartridge (e.g. with an eco-stop position at 50% flow), you also save water.
A two-handle faucet on a sink makes sense when: a) you want a retro or vintage look (a two-handle faucet with round handles has undeniable aesthetic value in art-deco or industrial loft-style bathrooms), b) you have a large hot water tank with low heating costs and want precise control of each side, c) you have children or seniors who are used to the old system and don't want to change their habits.
Bathtub and shower enclosure
With a bathtub, the situation becomes more complicated. A single-handle bathtub faucet is convenient for filling the tub and using the handheld shower – one handle controls both temperature and flow, and the switch between bathtub and shower is usually handled by a button or lever on the outlet. A big advantage is that when you step away from the tub and return, the temperature remains set.
Some plumbers and customers prefer a thermostatic faucet (thermostat) over a classic single-handle faucet for the bathtub – but that's already a different category. For an average family home with a combined bathtub faucet, the single-handle version is a reasonable compromise. For shower enclosures, a single-handle faucet is de facto the standard.
Kitchen sink
In the kitchen, the single-handle faucet is almost without competition. Your hands are full of pots, utensils, or vegetables, and you need to open the water with one hand or even your elbow. A two-handle faucet is ergonomically unsuitable here. The only exception is historic kitchens with original two-handle installation, where the customer doesn't want to change the hole spacing (usually 150 mm), but that's more of an exception confirming the rule.
Outdoor tap or utility room
Here, simplicity and durability win. A two-handle faucet (or a simple tap without mixing) is completely sufficient here – you usually only need cold water. Utility rooms, garages, garden connections – these are places where it pays to save on aesthetics and pay for durability.
Aesthetics and design – the look that also counts
The two-handle faucet has a strong position today in design-oriented bathrooms. Ceramic handles with winged or round shapes, chrome or matte finishes, and a symmetrical appearance – these are elements that are in demand in the renovation of family homes with historical interiors, or on the contrary, in modern minimalist-inspired bathrooms, where the symmetry of two handles is an intentional design decision.
The single-handle faucet dominates modern and contemporary interiors – Scandinavian, industrial, and functionalist bathrooms work with a single-handle faucet as a standard. An advantage is that a single-handle faucet takes up less space on the sink, as it has only one mounting hole (instead of two for a two-handle faucet), which is important for small sinks with shallow countertops.
You can find more information on how to choose a tap and from the perspective of spatial arrangement in the article Which type of Schütte tap is suitable for your bathroom space.
Installation and mounting – what you need to know before purchasing
This is the point where many customers make a mistake: they buy a tap and only then discover that their sink or countertop has a different hole (or a different number of holes) than the tap. A single-lever tap is installed in one hole with a diameter of 32–35 mm. A double-lever tap requires two holes with a typical center-to-center distance (pitch) of 150 mm, or 120–200 mm depending on the model.
There are also single-lever taps with a three-hole mounting (so-called three-hole single-lever taps) – these have their own thermometer and outlet at three locations, but the control is still one lever in the center. This version is used when you want the design of a double-lever tap but the convenience of a single-lever – it looks symmetrical aesthetically, but functionally it is a single-lever tap.
A detailed overview of dimensions, pitches, and connection dimensions can be found in a separate article Dimensions and connections of Schütte taps – what you need to know before purchasing. There you will also find tables with specific values according to the mounting types.
Price – what you actually get for your money
In the mid-price segment (approx. 40–120 €), both types of taps are comparable in quality today, if you buy from a reputable manufacturer. A single-lever tap is slightly more expensive in this segment – a cartridge is a more precise component than a simple washer. In the lower segment (under 25 €), single-lever taps are risky – a cheap cartridge made of unidentifiable material will last 2–3 years and its replacement may be problematic if spare cartridges are not easily available.
Double-lever taps in the lower segment are slightly more reliable, because the washer (seated) valves are less prone to failure due to manufacturing defects – it is a simpler mechanism. But again: it depends on the specific manufacturer and model.
Schütte as a brand is strong in the mid-segment in terms of price/performance ratio – more on this topic in the article Schütte vs. other brands – is it worth paying more for a quality tap, where there are specific comparisons.
Common problems and their relation to the type of tap
From practice, I know that some faults are typical for a specific type of tap:
- Dripping from the outlet in the closed position – in a single-lever tap this almost always means a worn-out cartridge. In a double-lever tap this can be a worn-out washer on one side, or a cracked rubber seal.
- Stiff, stuck lever – in a single-lever tap this problem is caused by limescale around the cartridge or its seized condition. In a double-lever tap stiffness of the handle indicates a rusted spindle mechanism or a cracked washer.
- Uncontrolled leak from under the body of the tap – usually a sealing problem at the connection, not related to the type of tap, but to the installation. Details in the article Step-by-step installation of a Schütte tap.
- Weak flow – in a single-lever tap the inlet neck filter mesh may be clogged. In a double-lever tap the same problem, but one washer may also be clogged, resulting in uneven distribution.
- Noisy tap when opening – typically due to incorrect water pressure or a worn-out cartridge seal – does not depend on the type.
A complete overview of faults and their solutions can be found in the article Common Schütte tap faults – dripping, stiff lever, weak pressure.
Eco-friendliness and consumption – what do the numbers say
An average household consumes 30–40% of daily water consumption through taps. Regulating flow and temperature is therefore not a negligible topic. Modern single-lever taps are usually equipped with an aerator (air mixer), which reduces the actual flow while maintaining the feeling of a full stream – typically from 12 l/min to 6–8 l/min. Some models have an eco-stop function, which requires a deliberate push on the lever for full flow – this is a small but effective habit-forming mechanism.
Double-lever taps also have an aerator – there is no fundamental difference. The difference is more in the behavioral aspect: a single-lever tap encourages the middle position (hot + cold at the same time even when not needed), while a double-lever tap encourages opening only one side. If electricity for heating TÚV is available in the household, this may be relevant.
Summary – which one is better then?
There is no universal answer, and whoever tells you there is, don’t listen to them. The choice depends on the context, the place of use, the household habits, and the aesthetic intention. But let’s make some practical conclusions:
- Single-lever tap is a better choice for most modern bathrooms and kitchens: more comfortable one-handed operation, quick temperature setting, compact mounting into one hole, long life with a quality cartridge, standard design for contemporary interiors.
- Double-lever tap is a better choice when: a historical or design interior requires the symmetry of two handles, when there are existing holes in a 150 mm pitch, when the customer wants separate control of cold and hot water due to habit or energy saving, or during renovations where changing the hole layout is not practically feasible.
In the Schütte taps portfolio you will find both types – from basic basins through bath taps to kitchen versions, in various surface finishes (chrome, matte black, gold). Before making a final decision, always check the hole pitch on the sink or countertop, the water pressure in the network, and whether the tap will be used in a low-pressure or high-pressure system.
Frequently asked questions (FAQ)
Can I replace a double-lever tap with a single-lever one without drilling?
It depends on the situation. If you have a sink with two holes in a 150 mm pitch, you can use a single-lever tap with an angled set and covers – you cover the second hole with a decorative plug and use only one hole. If the sink is monolithic (e.g., solid stone or acrylic) with fixed holes, it depends on whether the manufacturer offers plugs. In some cases, it is simpler to keep the double-lever tap or choose a three-hole model of a single-lever tap, which uses both holes elegantly.
How long does a cartridge in a single-lever mixer last?
With a quality ceramic cartridge from a reputable manufacturer (Kerox, Sedal) and normal water quality (hardness up to 20 °dH), it realistically lasts 12–20 years. In soft water, it may even last longer. Problems arise with very hard water without a water softener – limescale particles can damage ceramic surfaces, reducing the lifespan to 5–8 years. Regular cleaning of aerators and filter meshes helps extend the life of the entire system.
Is a single-lever mixer suitable for children and seniors?
For children, a single-lever mixer is more suitable – one lever is more intuitive to operate. However, be cautious about the absence of a temperature limiter: without a thermostatic cartridge or ecolimiter, a child could set the water too hot. Some cartridges have an adjustable stop (rotary limiter), which limits the maximum temperature. For seniors, it depends on habit – if they have been used to a two-lever mixer for decades, the transition can be confusing, and a two-lever mixer may remain more comfortable for them.
What is a three-hole single-lever mixer and when is it useful?
A three-hole single-lever mixer is a mixer with one lever and control, but with two inlet connections on either side and an outlet in the center – visually, it looks like a two-lever mixer. The inlet nozzles are hidden under a cover plate on each side. It is used with sinks with two holes (spacing 150 mm), where the customer wants the aesthetics of a two-lever mixer but the convenience and mechanics of a single-lever mixer. It is an elegant solution for renovation projects.
Does the type of mixer affect water pressure and flow?
Directly, no – the decisive factor is the pressure in the household plumbing (optimum 2.5–4 bar) and the diameter of the inlets (3/8" or 1/2"). Indirectly, yes: a 35 mm cartridge allows a higher flow than a smaller 25 mm cartridge, and a valve insert in a two-lever mixer can be flow-limiting if poorly chosen. For mixers with low-pressure boilers (pressure below 1 bar), it is important to explicitly choose mixers certified for low pressure – this applies to both types equally.
Can I replace a single-lever mixer myself, or do I need a plumber?
A standard mixer replacement (same type, same hole, same spacing) is a DIY job for a skilled DIY enthusiast. You shut off the water at the angle valves, disconnect the supply lines, replace the mixer, and seal it. If you are changing the type or hole layout, or if there are no angle valves in the system, call a plumber. A detailed step-by-step guide can be found in the article Installing a plumbing mixer Schütte step by step.
Conclusion
A single-lever and a two-lever mixer are not just two aesthetic variations of the same product – they are different technical philosophies of water control, each with its own strengths. The single-lever mixer has won the market with its comfort and speed of use, while the two-lever mixer remains relevant where aesthetics, habit, or existing installation matter. The right choice is the one that fits your specific conditions – not the one that the seller is promoting because it is left in stock.
If you are still undecided, browse the entire category of Schütte plumbing mixers and compare specific models, or read more articles in our Knowledge Center – from selection through installation to daily maintenance.
Do you have a question about this topic?
Can't decide or dealing with a specific situation in your home? Write to us – we are happy to help.