If you’re looking for a high-end reverse osmosis system in the UK, the Waterdrop X12 is one of the most advanced options currently available.
But there’s one major thing you need to know before buying…
👉 It’s larger than most under-sink systems.
This Waterdrop X12 review UK involves testing in a real UK kitchen setup — and while the performance and build quality are excellent, it won’t fit every home.
💧 Concerned About PFAS in UK Tap Water?
If you’re specifically looking to remove PFAS (also known as “forever chemicals”) from drinking water, reverse osmosis systems like the Waterdrop X12 are one of the most effective solutions available.
I’ve put together a full guide here:
👉 PFAS Water Filter UK – Best Systems Compared
This breaks down:
- What PFAS actually are
- Whether they’re present in UK water
- The best filters to remove them effectively
🔍 Quick Answer (Should You Buy It?)
The Waterdrop X12 is one of the best reverse osmosis systems I’ve tested, with:
- Premium build quality
- Much faster flow rate than older models
- Heavy-duty, high-end tap
- Advanced multi-stage filtration
👉 If you have the space, this is the system I would choose without hesitation.
However:
👉 In my case, it didn’t fit under a standard UK sink due to pipework from a double bowl setup.
📦 What’s Included
Inside the box you get:
- Main X12 filtration unit
- Premium metal faucet
- Pipes and connectors
- Power supply
- Installation kit
The unboxing experience feels premium and well thought out, with everything clearly organised.
🧱 Build Quality & First Impressions
Compared to smaller models like the G2:
- The unit is more solid and substantial
- Filters are integrated cleanly into the design
- Everything feels engineered rather than assembled
Straight away, the X12 feels like a step above typical under-sink systems. The front has a quality magnetic cover to give the sleek appearance.
👉 The tap especially stands out — much heavier and more premium than standard RO taps.
🚰 Tap & Accessories (Premium Upgrade)
The included faucet is noticeably better than most systems:
- Solid metal construction
- Clean modern design
- Smooth operation
👉 This alone makes the system feel more “high-end” compared to cheaper RO setups.
📏 Waterdrop X12 Size & Dimensions (Important)
From testing:
- It’s much larger than typical under-sink units
- Width is the main issue in UK cupboards with plumbing
- Height can also be tight depending on shelving
👉 This is NOT a compact system.
Will Waterdrop X12 Fit Under a UK Sink?
In my setup:
- Double bowl sink
- Standard UK cupboard
- Extra pipework due to double bowl sink
👉 Result:
❌ It didn’t fit. The pipework blocked the depth needed, and there wasn’t enough clean space to install it comfortably. However due to top inlet pipes it is more likely to work in single sink bowl kitchens.
❌ It may NOT fit if you have:
- Double bowl sink (like mine)
- Lots of pipework
- Boiler or waste pipes underneath
✅ It WILL likely fit if you have:
- Single bowl sink
- Minimal pipe clutter
- More open cabinet space
Installation & Setup
Installation will take less than an hour with a standard UK plumbing kit. The colour-coded tubing will make it straightforward. It doesn’t require a separate booster pump because the X12’s internal pump keeps a steady pressure even with our lower mains flow.
If you’ve installed a regular under-sink filter before, this will feel familiar — just with an extra drain line for the waste water.
Faucet hole size
This is another very practical detail.
For my quartz worktop, I needed a 25mm diamond hole saw for the RO faucet hole to install the G5P700A faucet.
That’s slightly larger than the 22mm many people associate with standard tap-style installations.
If you’re fitting this into quartz, composite or stone, double-check the required faucet hole size before installation. I used one like this.
⚡ Performance & Specs (Why It’s So Good)
Even though I couldn’t install it fully, the specs are clearly a big upgrade over older models:
- Much faster flow rate (near instant water)
- Advanced multi-stage filtration
- Designed to remove contaminants like chlorine, heavy metals, PFAS
- Tankless design (no stagnant water)
👉 Compared to my current system, it’s a noticeable step up in capability.
Filtration Performance
Do Waterdrop Reverse Osmosis Systems Reduce PFAS (“Forever Chemicals”)?
With the UK Government publishing its PFAS Plan in 2026, more homeowners are asking whether home water filters can help reduce PFAS, sometimes called “forever chemicals.”
Reverse osmosis (RO) systems are among the most effective methods for removing contaminants from tap water. According to Waterdrop’s specifications, systems use a 0.0001 micron RO membrane, which is tested for reducing PFOA and PFOS, two of the most common PFAS compounds.
Some Waterdrop RO models also reference third-party testing and certifications such as NSF/ANSI 58 (RO systems) and NSF/ANSI 372 (lead-free materials). Certification can vary by model, so always check the exact Waterdrop product page for performance details.
For UK households, it’s important to understand that:
- Drinking water in England and Wales remains high quality
- The government is reviewing PFAS regulations
- RO systems provide an additional point-of-use barrier, rather than a solution to any confirmed nationwide contamination
For a deeper dive, see our full PFAS in UK drinking water guide, which explains risks, government plans, and which filtration systems are tested for PFAS reduction.ns risks, government plans, and which filtration systems are tested for PFAS reduction.
🔄 Waterdrop X12 vs G3P600 vs G2
| Model | Size | Performance | Best For |
|---|---|---|---|
| X12 | Large | 🔥 Best | Premium homes with space |
| G3P600 | Medium | Very good | Most UK homes |
| G2 | Compact | Good | Small cupboards |
– Best option if you have the space
👉 This is key:
- X12 = best performance
- G3 = best balance
- G2 = small space option
🔁 Best Alternative If It Doesn’t Fit
If space is an issue, I’d recommend:
Or:
👉 Waterdrop G2
- Best for tight cupboards
- Simpler setup
🔥 What About the G5P700A?
The G5P700A has been a popular option — but:
👉 It’s currently hard to find in stock in the UK. Check out my G5P700A review.
The X12 is effectively:
✔ Faster
✔ More advanced
✔ Better built
👉 So it’s now the main premium option to consider
👍 Pros & Cons
✅ Pros
- Premium build quality
- Excellent tap design
- Very fast water flow
- Advanced filtration
- Tankless system
❌ Cons
- Larger size
- Requires planning before install (may need alter pipes
🧠 Final Verdict
The Waterdrop X12 is:
👉 One of the best reverse osmosis systems available in the UK right now
But…
👉 It’s only the right choice if you have the space
💡 My honest take:
- If it fit under my sink → I would choose this without hesitation
- Because it didn’t → I’d go for the G3P600
💰 Where to Buy
👉 Check Latest Price on Waterdrop
The X12 is also available on Amazon, but at the time of writing it’s priced significantly higher (~£1299), making the official Waterdrop store the better option.
👉 Check Availability on Amazon
💧 Choosing the Right Water Filter for Your Home
If you’re still deciding which system is best, it’s worth understanding how reverse osmosis compares to other options available in the UK.
👉 See my full guide here: Best Reverse Osmosis System UK
👉 Or for full-home protection: Best Whole House Water Filter UK
In short:
- Reverse osmosis systems (like the X12) are best for ultra-clean drinking water, removing contaminants such as chlorine, heavy metals and PFAS
- Whole house filters protect your entire home, reducing limescale and improving water quality for showers, appliances and pipes
👉 In many cases, the best setup is a combination of both — a whole house system for general protection, paired with reverse osmosis for drinking water.
Waterdrop X12 Tankless Reverse Osmosis System
Waterdrop X12 review UK: tested under-sink reverse osmosis system with 1200 GPD flow rate, advanced PFAS reduction, smart faucet features and tankless design. See performance, pros, cons and real-world results for UK homes.
Product SKU: WD-X12
Product Brand: Waterdrop
Product Currency: GBP
Product Price: 1099.00
Product In-Stock: InStock
4.8
Pros
- Exceptional 1200 GPD flow rate
- Excellent PFAS and contaminant reduction
- Smart digital faucet with TDS monitoring
- Compact tankless design saves space
- Low waste ratio compared with older RO systems
- Long filter life reduces maintenance
- Fast tank-free dispensing
Cons
- Higher upfront cost than G3P600
- Requires power socket under sink
- Filter replacements are relatively expensive
- Installation more complex than countertop filters
- May be excessive for small households
Waterdrop X12 FAQs (UK)
Does the Waterdrop X12 remove PFAS?
Yes — reverse osmosis systems like the Waterdrop X12 are widely regarded as one of the most effective ways to remove PFAS (forever chemicals), along with chlorine, heavy metals, and other contaminants commonly found in drinking water.
👉 For a full breakdown, see: PFAS Water Filter UK
Will the Waterdrop X12 fit under a standard UK sink?
Not always. The X12 is significantly larger than most under-sink systems. In my case, it did not fit due to pipework from a double bowl sink.
👉 It’s more likely to fit if you have:
A single bowl sink
Minimal pipework
A larger cabinet
How big is the Waterdrop X12?
The X12 is considered a larger under-sink unit, especially compared to models like the G2 or G3.
👉 Check the size section above for real measurements and photos showing how it fits in a UK cupboard.
Is the Waterdrop X12 better than the G3P600?
Yes — in terms of performance.
X12 → faster flow, more advanced filtration, premium build
G3P600 → smaller, easier to install, better for most UK homes
👉 If you have the space, X12 is the better system.
👉 If space is tight, G3P600 is the smarter choice.
Is the Waterdrop X12 worth it in the UK?
Yes — if you have enough space.
It’s one of the most advanced reverse osmosis systems available, with:
High flow rate
Premium build quality
Strong filtration performance
Does the Waterdrop X12 need a plumber to install?
Not necessarily.
Most reverse osmosis systems are designed for DIY installation, but due to the size of the X12, installation may be more complex in tighter UK kitchens.
👉 If unsure, a plumber can install it quickly.
What is the difference between reverse osmosis and whole house filters?
Reverse osmosis (X12) → cleans drinking water at the tap
Whole house filters → treat all water entering your home
👉 See:
Best Reverse Osmosis System UK
Best Whole House Water Filter UK
What’s the best alternative if the X12 doesn’t fit?
If you don’t have enough space, the best alternatives are:
Waterdrop G3P600 → best balance of size and performance
Waterdrop G2 → best for small cupboards
👉 These are easier to install in standard UK kitchens.
