Waterdrop X12 vs G5P700A UK (2026) — Which Waterdrop RO System Is Better?

If you’re trying to choose between the Waterdrop X12 and the older G5P700A, the decision really comes down to:

• budget
• performance
• running costs
• future-proofing
• current UK availability

The Waterdrop G5P700A became one of the most popular under-sink reverse osmosis systems in the UK because it combined:

• fast flow rates
• alkaline remineralisation
• compact installation
• excellent taste improvement
• strong contaminant reduction

…at a much lower price than many premium systems. See the full Waterdrop G5P700A review here.

However, Waterdrop’s newer X12 pushes things much further with:

• 1200GPD ultra-fast flow
• UV sterilisation
• upgraded alkaline remineralisation
• advanced smart faucet technology
• stronger PFAS and contaminant reduction positioning

Read the Waterdrop X12 review here.

The biggest issue in 2026 is availability.

The G5P700A is now frequently out of stock in the UK, while Waterdrop appears to be focusing more heavily on newer flagship systems such as the X12 and X16.

If you’re still comparing different reverse osmosis systems, see our guide to the Best Under Sink Reverse Osmosis Systems UK.

If you live in a hard water area such as London, Kent, Surrey or Hertfordshire, both systems are a major upgrade over standard carbon jug filters and basic tap attachments.

Why This Page Matters

UK homeowners are becoming increasingly concerned about:

• hard water
• limescale
• chlorine taste
• dissolved contaminants
• PFAS (“forever chemicals”)

While standard carbon filters can improve taste and odour, reverse osmosis systems use ultra-fine membranes capable of reducing much smaller dissolved contaminants.

That’s why premium under-sink RO systems are becoming increasingly popular across:

• London
• Kent
• Surrey
• Essex
• Hertfordshire
• other hard water areas in the South East

For many households, the goal is no longer just softer-tasting water — it’s cleaner, better-filtered drinking water with lower ongoing bottled water dependence.

💧 Check Water Hardness First

Hard and very hard water areas benefit most from water softeners and whole-house systems.

👉 Check your postcode water hardness level

Quick Verdict

Choose the Waterdrop G5P700A if:

• you find it in stock at a sensible UK price
• you want the best value
• you mainly care about taste and contaminant reduction
• you want lower running costs

Choose the Waterdrop X12 if:

• you want Waterdrop’s flagship system
• you want UV sterilisation
• you want ultra-fast water flow
• you want the newest technology platform
• you care about maximum contaminant reduction

Choose the Waterdrop G3P600 if:

• the X12 feels too expensive
• the G5P700A remains unavailable
• you want the best balance between price and performance
• you still want fast-flow tankless RO

💧 Looking for the Best Waterdrop RO System?

If you want Waterdrop’s latest flagship technology, the X12 offers ultra-fast 1200GPD flow, UV sterilisation and advanced remineralisation.

👉 Check the latest Waterdrop X12 price and current discounts here.

Which Waterdrop System Is Best for You?

Best Premium System

Waterdrop X12

Best Value System

Waterdrop G5P700A

Best Mid-Range Option

Waterdrop G3P600

Best for PFAS-Focused Buyers

Waterdrop X12

Best for Smaller Kitchens

Waterdrop G3P600

Waterdrop X12 vs G5P700A Comparison Table

Best Mid-Range Alternative: Waterdrop G3P600

Because the G5P700A is now frequently unavailable in the UK, many buyers are either moving up to the X12 or choosing the more affordable G3P600 instead.

The Waterdrop G3P600 is probably the best middle-ground option for most UK households.

It still offers:

• tankless under-sink installation
• fast 600GPD flow
• alkaline remineralisation
• compact design
• excellent taste improvement
• strong contaminant reduction

While it lacks some premium X12 features such as:

• UV sterilisation
• 1200GPD ultra-fast flow
• advanced digital faucet controls

…it remains one of the strongest value reverse osmosis systems currently available for UK homes.

For many households, the G3P600 is actually the “sweet spot” between:

• affordability
• performance
• running costs
• installation simplicity

In most UK homes, the biggest difference you’ll notice day-to-day is flow rate and convenience rather than filtration quality alone. Even the G3P600 already feels dramatically faster and more practical than traditional tank-based RO systems or countertop filters.

Read our full Waterdrop G3P600 Review UK here.

You can also compare the Waterdrop G3P600 vs G5P700A if you’re trying to decide between the two mid-range systems.

💧 Want Better Value Than the X12?

The Waterdrop G3P600 remains one of the best-value tankless reverse osmosis systems available for UK homes and costs significantly less than the X12.

👉 View the latest G3P600 offers here.

2026 UK Update: Why PFAS Matters Now

Standard water testing traditionally focused on:

• hardness
• chlorine
• bacteria
• heavy metals

But PFAS in UK drinking water is now receiving much greater attention.

In February 2026, the UK Government published its first national PFAS Plan, marking a major shift in how these persistent chemicals may be regulated in future.

Key developments include:

• consultation on a statutory PFAS limit
• monitoring of 48 named PFAS compounds
• greater focus on long-term environmental exposure

Importantly, UK tap water remains highly regulated and generally safe to drink.

However, growing monitoring of PFAS is one reason many UK homeowners are now looking more closely at reverse osmosis systems capable of filtering dissolved contaminants beyond what standard carbon filters can typically reduce.

You can also read our full guide to PFAS in UK Drinking Water.

Latest UK PFAS Research (June 2026)

A major May 2026 study from Imperial College London analysed tap water samples from 89 households across 28 London boroughs and detected trace levels of PFAS compounds.

Importantly, the researchers confirmed all detected levels remained within current UK and EU drinking water safety standards.

However, the study also highlighted the importance of continued monitoring of emerging contaminants over time.

The findings mirror growing international concern around PFAS exposure and come shortly after the UK Environmental Audit Committee called for stronger oversight of persistent chemical pollution.

While UK tap water remains highly regulated and generally safe to drink, many homeowners now choose to add an additional layer of filtration using reverse osmosis systems designed to reduce:

• dissolved contaminants
• chlorine
• PFAS compounds
• heavy metals
• unwanted tastes and odours

If you live in London, see our London Water Hardness Guide.
If you live in Kent, see our Kent Water Hardness Guide.
You can also use our UK Water Hardness Checker to see how hard your local water supply is.

Waterdrop X12: Main Advantages

1. Extremely Fast Flow Rate

The X12 delivers an impressive 1200GPD capacity.

For larger UK households this means:

• faster glass filling
• improved cooking convenience
• less waiting during heavy use

2. UV Sterilisation

Unlike the older G5P700A, the X12 includes integrated UV sterilisation technology.

This adds another purification layer alongside:

• reverse osmosis membranes
• activated carbon
• remineralisation stages

3. Strong PFAS & Contaminant Positioning

The X12 heavily targets:

• PFAS reduction
• heavy metals
• chlorine
• dissolved solids
• chemical contaminants

This aligns strongly with current UK water quality discussions.

Waterdrop G5P700A: Why It’s Still Excellent

Despite being older, the G5P700A remains one of the best-value under-sink reverse osmosis systems for UK homes.

Key strengths:

• lower purchase price
• compact installation
• alkaline remineralisation
• excellent taste improvement
• lower running costs
• strong flow performance

For many households, the G5P700A still represents the better balance between price and performance.

However, because stock levels are becoming less consistent in the UK, many buyers are now comparing it more closely with the newer X12 and the more affordable G3P600.

Which Waterdrop System Is Better for Hard Water?

Both systems perform very well in UK hard water areas including:

• London
• Kent
• Surrey
• Essex
• Hertfordshire

However, neither system replaces a whole-house water softener.

Reverse osmosis systems primarily improve:

• drinking water quality
• taste
• dissolved contaminant reduction

They do not stop limescale throughout the entire property.

If you live in a severe hard water area, the ideal setup is often:

• whole-house sediment/carbon pre-filtration
  PLUS
• under-sink reverse osmosis for drinking water

For homes with extremely hard water, many UK homeowners now combine a whole-house sediment or carbon filtration system with an under-sink reverse osmosis setup for drinking water.

See our guides to:

• Best Whole House Water Filter for Hard Water UK
• Whole House Water Filter vs Reverse Osmosis UK
• Water Softener vs Reverse Osmosis UK

Running Costs Comparison

Waterdrop X12

Higher:

• initial purchase cost
• replacement filter pricing

But:

• newer technology
• stronger feature set
• UV sterilisation
• faster flow rate

Waterdrop G5P700A

Lower:

• filter costs
• overall ownership cost

Still one of the strongest value RO systems available in the UK.

Waterdrop G3P600

Likely the best middle-ground option for:

• running costs
• purchase price
• performance balance

Is the G5P700A Being Replaced?

Possibly.

The G5P700A is now frequently unavailable in the UK market, while Waterdrop appears to be focusing more heavily on:

• X12
• X16
• newer X-Series systems

This may eventually make the X-series Waterdrop’s primary premium platform.

Ready to Upgrade Your Drinking Water?

Whether you’re concerned about:

• hard water
• PFAS (“forever chemicals”)
• chlorine taste
• kettle limescale

a quality reverse osmosis system can dramatically improve your drinking water.

My recommendations:

🥇 Best Premium System: Waterdrop X12
🥈 Best Value System: Waterdrop G5P700A (if available)
🥉 Best Mid-Range Choice: Waterdrop G3P600

👉 Compare current Waterdrop prices and discounts.

Final Verdict

Best Value

Waterdrop G5P700A

Best Mid-Range Option

Waterdrop G3P600

Best Overall Technology

Waterdrop X12

Best Premium Long-Term Setup

Whole-house filtration + Waterdrop X12

That combination gives:

• scale reduction
• cleaner appliance water
• improved shower water
• ultra-pure drinking water at the kitchen tap

For many hard water UK homes, this is one of the best long-term filtration setups currently available.

FAQs

Related Guides

• Best Waterdrop Reverse Osmosis Systems UK
• Best Under Sink Reverse Osmosis Systems UK
• PFAS in UK Drinking Water
• Waterdrop G5P700A Review UK
• Waterdrop X12 Review UK
• Best Water Filter for Hard Water UK
• Surrey Water Hardness Guide
• London Water Hardness Guide
• Water Softener vs Reverse Osmosis UK