Understanding the Difference Between Modern Boiling Water Tap Systems
As boiling water taps become an increasingly popular kitchen upgrade, homeowners are discovering that not every system offers the same functionality.
One of the most common questions is:
What's the difference between a 3-in-1 and a 4-in-1 boiling water tap?
At first glance, the two may appear very similar. Both provide standard hot and cold water alongside instant filtered near-boiling water, helping to replace the traditional kettle and create a cleaner, more streamlined kitchen.
The key difference is simple: a 4-in-1 boiling water tap also provides filtered cold drinking water.
In this guide, we'll explain exactly how each system works, compare the benefits of both and help you decide which boiling water tap is right for your kitchen.
What Is a 3-in-1 Boiling Water Tap?
A 3-in-1 boiling water tap combines three water functions into a single fixture:
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Standard hot water
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Standard cold water
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Filtered near-boiling water
Rather than having a conventional kitchen tap alongside a separate kettle, these functions are brought together within one integrated design.
For many households, this offers an ideal balance between everyday convenience, functionality and design simplicity.
Why Choose a 3-in-1 Tap?
A 3-in-1 boiling water tap is well suited to households that want the convenience of filtered near-boiling water without needing a separate filtered cold drinking-water function.
Benefits can include:
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Instant filtered near-boiling water
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Reduced worktop clutter
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A clean, integrated appearance
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Simple everyday operation
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Everything required to replace a conventional mixer tap and kettle
For many kitchens, a 3-in-1 tap provides all the functionality required for everyday hot drinks, cooking and food preparation.
What Is a 4-in-1 Boiling Water Tap?
A 4-in-1 boiling water tap provides all the functionality of a 3-in-1 system while adding a fourth water function:
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Standard hot water
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Standard cold water
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Filtered near-boiling water
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Filtered cold drinking water
The addition of filtered cold drinking water is the main difference between a 4-in-1 system and its 3-in-1 counterpart.
This can reduce the need for separate countertop filter jugs or bottled drinking water while keeping all four functions within one kitchen tap.
Why Choose a 4-in-1 Tap?
A 4-in-1 system may be particularly appealing for households that regularly drink filtered water and want an integrated alternative to separate filtration products.
Benefits can include:
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Fresh filtered cold drinking water on demand
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Filtered near-boiling water for hot drinks and cooking
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Reduced reliance on bottled water
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Cleaner-tasting drinking water
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Fewer countertop appliances and filter jugs
For households that already use a water filter jug or regularly purchase bottled drinking water, a 4-in-1 tap can simplify everyday routines while helping keep the worktop clearer.
3-in-1 vs 4-in-1 Boiling Water Taps: What's the Difference?
Both systems share many of the same benefits. The key question is whether you also want filtered cold drinking water directly from your kitchen tap.
| Feature | 3-in-1 Tap | 4-in-1 Tap |
|---|---|---|
| Standard Hot Water | ✓ | ✓ |
| Standard Cold Water | ✓ | ✓ |
| Filtered Near-Boiling Water | ✓ | ✓ |
| Filtered Cold Drinking Water | ✗ | ✓ |
| Can Replace a Conventional Kitchen Mixer | ✓ | ✓ |
| Can Replace the Kettle | ✓ | ✓ |
| Can Reduce Worktop Clutter | ✓ | ✓ |
Ultimately, if filtered near-boiling water is your main priority, a 3-in-1 system may provide everything you need. If you also want filtered cold drinking water directly from the tap, a 4-in-1 system is likely to be the better fit.
Which Option Is Better for Modern Kitchens?
Both 3-in-1 and 4-in-1 boiling water taps work particularly well within contemporary kitchen design.
Modern kitchens increasingly favour products that combine several functions within one considered fixture.
By reducing the need for:
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A kettle
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Separate countertop appliances
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Water filter jugs on 4-in-1 systems
boiling water taps can help create cleaner worktops and make more efficient use of kitchen space.
This approach fits naturally with the principles behind the clutter-free kitchen, where integrated products and thoughtful organisation create a calmer, more streamlined environment.
Do 3-in-1 and 4-in-1 Taps Use the Same Size Boiler?
Not necessarily in every system, but the additional filtered cold drinking-water function of a 4-in-1 tap doesn't automatically mean a larger near-boiling water tank is required.
Standard hot and cold water — and the filtered cold function on a 4-in-1 system — don't rely on stored near-boiling water in the same way as the boiling-water function.
Boha Living systems use a compact 2.4-litre under-sink boiler designed around normal domestic use.
Our guide to boiling water tap tank capacity explains how tank size, household usage and recovery performance work together.
Do 3-in-1 and 4-in-1 Taps Require Different Installation?
The basic installation requirements are similar because both systems need suitable plumbing, under-sink space and an electrical supply for the boiler.
The exact connections and filtration arrangement vary depending on the individual system, so the manufacturer's installation instructions should always be followed.
Before buying, check that you have sufficient room beneath the sink for the boiler, filtration components, pipework and future maintenance access.
Our boiling water tap installation guide explains what to check before fitting either system.
What About Water Filtration?
Both Boha 3-in-1 and 4-in-1 systems provide filtered near-boiling water.
The main filtration difference from the user's perspective is that a 4-in-1 tap also provides filtered cold drinking water directly from the tap.
Like any filtration system, replacement cartridges require routine changing to maintain the intended water quality and system performance.
For Boha systems, filter replacement is recommended every 3–6 months depending on usage and water conditions, with replacement required at least every six months using Boha-supplied filters to maintain warranty cover.
Our guide to boiling water tap filter replacement explains the maintenance requirements in more detail.
Design Considerations
At Boha Living, we believe practical products should also complement the overall design of the kitchen.
Whether you choose a 3-in-1 or 4-in-1 system, the finish and style of your tap can have a noticeable effect on the finished space.
Popular finishes include:
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Brushed Brass
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Matt Black
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Chrome
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Gunmetal
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Brushed Steel
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Brushed Copper
These finishes can be coordinated with cabinetry, worktops, lighting and hardware to create a more cohesive kitchen scheme.
Our guide to boiling water tap finishes for modern kitchens explores the different options in more detail.
Which Is Better for Families?
Both systems can work well in busy family kitchens.
A 4-in-1 tap may be particularly appealing for households that:
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Drink large quantities of filtered water
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Regularly use a water filter jug
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Want filtered cold drinking water available directly from the tap
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Prefer an all-in-one kitchen solution
Meanwhile, a 3-in-1 system remains a strong choice for households primarily focused on replacing the kettle and gaining instant filtered near-boiling water.
If you have younger children, our guide to boiling water tap safety for families explains features such as child-safe controls and insulated spouts.
Frequently Asked Questions
Is a 4-in-1 boiling water tap worth the extra cost?
That depends on whether your household will regularly use filtered cold drinking water. If you already use filter jugs or purchase bottled water, the additional function may provide worthwhile everyday convenience. If filtered near-boiling water is your main priority, a 3-in-1 system may be all you need.
What's the main difference between a 3-in-1 and 4-in-1 boiling water tap?
A 3-in-1 tap provides standard hot water, standard cold water and filtered near-boiling water. A 4-in-1 tap provides those same three functions plus filtered cold drinking water.
Do 3-in-1 and 4-in-1 taps require the same installation?
The main requirements are similar, including suitable plumbing, an under-sink boiler, filtration components and an appropriate electrical supply. The exact connections depend on the system, so always follow the manufacturer's installation guidance.
Do 3-in-1 and 4-in-1 taps use the same size boiler?
They can. The filtered cold drinking-water function of a 4-in-1 tap doesn't automatically require a larger near-boiling water tank. Boiler capacity should instead be chosen according to the design of the complete system and expected household usage.
Are both types suitable for family homes?
Yes, when correctly installed and used as intended. Quality boiling water taps can incorporate features such as child-safe activation controls and insulated spouts to help make everyday use more controlled.
Which is better: 3-in-1 or 4-in-1?
Neither is universally better. Choose a 3-in-1 if you primarily want standard hot and cold water plus filtered near-boiling water. Choose a 4-in-1 if you also want filtered cold drinking water directly from the tap.
Which Boiling Water Tap Should You Choose?
There is no universal right or wrong answer.
A 3-in-1 boiling water tap provides standard hot water, standard cold water and filtered near-boiling water from one integrated fixture.
A 4-in-1 boiling water tap adds filtered cold drinking water, making it a more comprehensive option for households that regularly use filtered water.
The best choice ultimately depends on how you use your kitchen and which features are most important to your household.
If you're still comparing the wider features, installation requirements and ownership costs, our complete buying guide will cover these considerations once published.
Final Thoughts
Both 3-in-1 and 4-in-1 boiling water taps can provide a practical alternative to the traditional kettle while helping create a cleaner, more streamlined kitchen.
The decision is ultimately straightforward: if filtered near-boiling water is your main priority, a 3-in-1 system may be all you need. If you also want filtered cold drinking water on demand, a 4-in-1 system adds that extra functionality.
By choosing the system that best reflects the way your household actually uses water, you can avoid paying for features you don't need while investing in functionality you'll appreciate every day.
Explore our boiling water tap collection to compare contemporary 3-in-1 and 4-in-1 designs, finishes and functionality.
