Everything You Need to Know Before Installing a Boiling Water Tap
A boiling water tap can completely change the way you use your kitchen.
From making your morning coffee to preparing vegetables or filling a saucepan, having filtered near-boiling water available almost instantly removes one of those small everyday waits we have simply become accustomed to.
If you're thinking about making the switch, however, one practical question usually comes up fairly quickly:
Can you install a boiling water tap yourself?
For someone with good plumbing knowledge and experience, installing certain boiling water tap systems may be possible. However, because installation involves both the kitchen water supply and an under-sink boiling water system, professional installation is often the simplest and most reassuring option.
In this guide, we'll explain what's involved in fitting a boiling water tap, what you'll need beneath the sink and when it's better to call in a professional.
How Is a Boiling Water Tap Installed?
At first glance, a boiling water tap looks much like any other kitchen tap.
The main difference is what happens beneath the worktop.
Rather than connecting only to your usual hot and cold water supplies, a boiling water tap system typically incorporates:
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The kitchen tap
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An insulated under-sink boiler tank
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A water filtration system
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Hot and cold water connections
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A connection between the boiler and tap
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An appropriate electrical supply for the boiler
Once installed, the tank heats and stores a supply of filtered water at the selected temperature, ready to be dispensed through the tap whenever required.
It's this additional equipment beneath the sink that makes installation slightly more involved than replacing a conventional mixer tap.
Can a Boiling Water Tap Replace Your Existing Kitchen Tap?
In many kitchens, yes.
Boiling water taps are designed to perform the everyday functions of a normal kitchen mixer while adding filtered boiling water functionality.
A 3-in-1 boiling water tap provides:
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Standard hot water
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Standard cold water
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Filtered boiling water
A 4-in-1 boiling water tap adds:
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Filtered cold drinking water
This means the boiling water tap can generally become the main tap at your kitchen sink rather than requiring a completely separate fixture.
For homeowners planning a kitchen renovation, this makes it relatively easy to incorporate the system from the beginning.
It can also make upgrading an existing kitchen surprisingly straightforward.
What Do You Need Under the Sink?
One of the most important things to consider before purchasing a boiling water tap is the space beneath your kitchen sink.
The boiler and filtration components need somewhere to live.
Fortunately, modern boiling water systems are designed with domestic kitchens in mind, and compact tanks can usually be accommodated inside a standard kitchen base unit.
Before installation, it's worth checking that there is sufficient room alongside any existing:
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Waste pipework
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Cleaning products
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Recycling systems
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Pull-out storage
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Water filtration equipment
Planning the space in advance helps make installation considerably easier.
Do You Need an Electrical Supply?
Yes, the boiling water tank requires electricity to heat and maintain the water at the selected temperature.
This means an appropriate power supply needs to be available beneath or close to the sink area.
If your kitchen already has a suitable electrical supply in the correct location, installation may be relatively straightforward.
If electrical work is required, this should be carried out by someone appropriately qualified to complete the work safely and in accordance with applicable requirements.
This is one of the reasons it's worth considering the installation requirements before ordering your boiling water tap rather than waiting until fitting day.
Do You Need a Plumber to Install a Boiling Water Tap?
Not necessarily in every situation, but for most homeowners, using an experienced installer is the easiest option.
A competent plumber or kitchen installer will already be familiar with:
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Water connections
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Flexible hoses
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Isolation valves
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Sink fittings
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Leak testing
Boiling water tap systems also have their own installation instructions, which should always be followed carefully.
Professional installation can provide added reassurance that everything has been connected correctly and that the system is ready for everyday use.
Can a Competent DIYer Install One?
If you're experienced with domestic plumbing and confident working with kitchen taps and water connections, some systems may be suitable for DIY installation.
However, it's important not to underestimate the job simply because the finished tap looks similar to a conventional mixer.
You're installing an entire system rather than just a tap.
That means correctly positioning and connecting:
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The tap
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Boiler
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Filter
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Water supply
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Associated pipework
You'll also need to ensure every connection is secure and thoroughly check the system for leaks before use.
If you're unsure about any part of the process, professional installation is the better option.
How Much Space Does a Boiling Water Tank Need?
This depends on the individual system.
Boiling water tanks are specifically designed to fit beneath kitchen sinks, but dimensions vary between manufacturers and models.
At Boha Living, our complete boiling water tap systems use compact under-sink boilers designed to integrate discreetly into a modern kitchen setup.
It's always worth checking the dimensions of your chosen system against the available cupboard space before installation.
Remember to allow space not only for the tank itself but also for pipework, filtration components and access for future filter replacement.
Can You Install a Boiling Water Tap in an Existing Kitchen?
Absolutely.
You don't need to be fitting an entirely new kitchen to enjoy the benefits of a boiling water tap.
For many homeowners, replacing the existing mixer tap with a boiling water system is an effective way to modernise the kitchen without undertaking a major renovation.
Provided you have:
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Suitable under-sink space
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Appropriate water connections
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The required electrical supply
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A compatible sink or worktop installation
an existing kitchen can often be upgraded relatively easily.
It's one of the reasons boiling water taps have become such a popular standalone kitchen improvement.
What About a New Kitchen?
If you're currently designing a new kitchen, it's the perfect opportunity to plan for a boiling water tap.
Considering the system early allows your kitchen fitter to make provision for:
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Boiler location
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Filter access
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Electrical supply
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Plumbing connections
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Under-sink storage
This makes the finished installation feel completely integrated rather than something that has been added afterwards.
It also allows you to coordinate your tap finish with the rest of the kitchen.
Finishes such as brushed brass, matt black, gunmetal and chrome can be paired with cabinet hardware, lighting and appliances to create a beautifully cohesive look.
How Long Does Installation Take?
Installation time varies depending on the kitchen and whether the necessary plumbing and electrical provision is already available.
Replacing an existing tap in a kitchen that's already suitably prepared will generally be more straightforward than an installation requiring additional plumbing or electrical work.
The important thing isn't how quickly the system can be installed, but that it's installed correctly.
Following the manufacturer's instructions and carefully checking every connection helps ensure reliable long-term performance.
What Should You Check Before Buying?
Before choosing your boiling water tap, it's worth carrying out a few simple checks.
Under-Sink Space
Make sure there is enough room for the boiler and filter while retaining suitable access for future maintenance.
Electrical Supply
Check whether the required power supply is available in the correct location.
Water Connections
Your installer should confirm that the existing plumbing arrangement is suitable for the system.
Tap Hole and Worktop
Confirm that the chosen tap can be fitted correctly to your sink or worktop.
Water Pressure
Check the manufacturer's recommended water pressure requirements for your chosen system.
Taking a few minutes to consider these points before ordering can make installation much smoother.
Is a Boiling Water Tap Difficult to Maintain After Installation?
Once installed correctly, a boiling water tap is designed to require relatively little day-to-day attention.
Routine maintenance typically centres around replacing the water filter at the recommended interval and keeping the tap clean.
It's also sensible to occasionally check beneath the sink for any signs of moisture or leaks, just as you would with any plumbing installation.
With appropriate care, a quality boiling water tap can provide years of convenient everyday use.
Why Professional Installation Can Be Worth It
For confident DIYers, fitting a boiling water tap may feel like another kitchen project.
For everyone else, professional installation can remove much of the uncertainty.
An experienced installer can ensure that:
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Connections are made correctly
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Pipework is securely fitted
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The boiler is positioned appropriately
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The system is tested for leaks
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The manufacturer's installation guidance is followed
Considering how frequently a boiling water tap is likely to be used, getting the installation right from the beginning is worthwhile.
Frequently Asked Questions
Can I install a boiling water tap myself?
A competent DIYer with suitable plumbing experience may be able to install some boiling water tap systems. However, because the installation involves a boiler, filter and multiple water connections, many homeowners prefer professional installation.
Do I need an electrician for a boiling water tap?
The boiler requires an appropriate electrical supply. If suitable provision is already available, additional electrical work may not be necessary. If changes to the electrical installation are required, these should be completed by an appropriately qualified person.
Can a boiling water tap replace my normal kitchen tap?
Yes. 3-in-1 boiling water taps provide standard hot and cold water alongside filtered boiling water, while 4-in-1 models also provide filtered cold drinking water.
Do I need a separate tap hole for a boiling water tap?
In many installations, the boiling water tap simply replaces the existing kitchen mixer tap, although compatibility should always be checked for your particular sink, worktop and chosen model.
Does the boiling water tank go under the sink?
Yes. The boiler and filtration components are normally positioned discreetly inside the kitchen cupboard beneath the sink.
Can you add a boiling water tap to an existing kitchen?
Yes. Provided the kitchen has suitable plumbing, electrical provision and under-sink space, a boiling water tap can often be fitted without replacing the kitchen itself.
Should You Install a Boiling Water Tap Yourself?
Ultimately, it comes down to your experience and confidence.
For someone comfortable with domestic plumbing and familiar with fitting kitchen taps, installation may be manageable when the manufacturer's instructions are followed carefully.
For most homeowners, however, professional installation offers greater convenience and reassurance.
Whichever route you choose, planning ahead is key.
Checking your cupboard space, water connections and electrical provision before purchasing ensures the installation process is as straightforward as possible.
Final Thoughts
Installing a boiling water tap is more involved than simply replacing one kitchen tap with another, but it doesn't need to be complicated.
With a compact boiler hidden beneath the sink, appropriate filtration and the correct connections in place, the entire system integrates neatly into the modern kitchen.
Once installed, the benefits quickly become part of everyday life: instant filtered boiling water, less waiting, cleaner worktops and one beautifully designed tap performing multiple functions.
Whether you're renovating an entire kitchen or simply looking for one upgrade that makes the space feel noticeably more considered, a boiling water tap offers a surprisingly simple way to transform how your kitchen works every day.
