Waterdrop G3P600 vs G5P700A — Comparison

Introduction

If you’re choosing between the Waterdrop G3P600 and the Waterdrop G5P700A, you’re already looking at two of the best tankless RO systems available in the UK. Both deliver excellent TDS reduction, fast flow rates, and compact under‑sink designs — but they’re built for slightly different types of households.

This comparison breaks down the real‑world differences in flow speed, noise, waste‑water efficiency, running costs, installation, and long‑term value so you can confidently choose the right model for your kitchen.

⚠️ Stock Update (UK):
The G5P700A is frequently unavailable through Waterdrop UK. If it is out of stock, check Amazon for current availability before deciding whether to upgrade to the X12.

Check Price on Amazon

👉 Best alternatives available now:
✔ Waterdrop G3P600 (in stock – fastest option)
✔ Waterdrop X12 / X16 (higher capacity premium option)

The newer Waterdrop X12 and X16 are premium upgrades — offering faster flow, improved filtration, and a more premium build. See the Waterdrop X12 review UK.

Check Latest Price on Waterdrop X12 (£1099) – Currently ~£200 cheaper than Amazon.

Read the Waterdrop G3P600 review here.

See Latest Waterdrop G3P600 Availability (£150 discount)

Model	Flow Rate	Best For	Price
G5P700A	High	Large households	❌ Out of stock
G3P600	Medium	Most homes	✅ Available
X12	Very High	High usage homes	✅ Available

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Best overall choice for most UK households: Waterdrop G5P700A — faster, more efficient, and currently often better value than the G3P600.

You’ll be taken directly to the official Waterdrop UK store to view current pricing and availability for each system. Buying direct from Waterdrop UK often includes a longer warranty and faster customer support. Prefer Amazon Prime delivery? Check current prices below.

Waterdrop is now the most popular RO brand in the UK, largely because of its tankless, high-flow, low-waste systems. Two of its best-selling models — the Waterdrop G3P600 and the Waterdrop G5P700A — offer premium filtration, fast flow rates and compact under-sink designs.

This guide compares Waterdrop G3P600 vs G5P700A in detail, but which system is best for your home? This comparison breaks down filtration performance, flow rate, TDS reduction, maintenance, noise levels, installation and overall value for money in the UK. If you’re unsure whether RO is necessary at all, the tap water quality testing guide will help you identify what needs removing

If you want a detailed look at the G5 series, see my full review of the Waterdrop G5P700A. You can also read the complete breakdown of the Waterdrop G3P600 to compare specifications individually. For an even higher-flow model, the Waterdrop X8 G3P800 review shows how the flagship 800GPD system performs.

👉 See latest UK pricing for the G5P700A here →

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Model Overview

Waterdrop G3P600 — Summary

The G3P600 is Waterdrop’s mid‑range tankless RO system. It delivers premium filtration without the higher price tag of the flagship models.

It’s perfect for households wanting premium filtration without paying top tier prices.Prefer Amazon Prime delivery? Check current prices on Amazon.

Check Price on Amazon

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Waterdrop G5P700A — Summary

The newer G5P700A steps things up with:

It’s designed for families who want the fastest possible RO water with the lowest running costs. Prefer Amazon Prime delivery? Check current prices on Amazon.

Check Price on Amazon

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Filtration Performance Comparison

Both RO systems use a multi-stage composite filter approach, but here’s how they differ:

Feature	G3P600	G5P700A
Filtration Stages	3	3
RO Membrane Flow	600 GPD	700 GPD
TDS Removal	90–95%	90–95%
Chlorine Removal	Excellent	Excellent
Heavy Metals (Lead, Arsenic, etc.)	Excellent	Excellent
PFAS Removal	Yes	Yes
Carbon Taste Improvement	Strong	Strong

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.

Verdict: Purity is the same — speed is not

Both systems produce equally pure RO water, removing chlorine, heavy metals, PFAS, pesticides, VOCs, and microplastics.

The G5P700A wins because:

• It processes water faster
• It uses a larger membrane
• It maintains performance better under heavy use

If you care only about purity, both are equal. If you care about purity + speed, the G5P700A is the better choice.

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Flow Rate & Daily Use

Flow rate determines how quickly you can fill:

• Jugs
• Pots
• Kettles
• Baby bottles
• Cooking pans

Model	Real-Life Fill Speed
G3P600	Fills a 1L jug in ~30 seconds
G5P700A	Fills a 1L jug in ~20–25 seconds

Verdict: G5P700A is faster and better for families

The G5P700A’s upgraded pump and larger membrane give it a clear advantage. If you regularly fill large containers — or have multiple people using the system — the speed difference adds up quickly.

For small households, the G3P600 is still perfectly fast. For medium‑to‑large households, the G5P700A feels noticeably quicker and more convenient.

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Waste Water Efficiency

All reverse‑osmosis systems produce some wastewater — but Waterdrop’s tankless designs are among the most efficient in the UK. This is one of the biggest differences between the G3P600 and the G5P700A.

Model	Waste Ratio
G3P600	1:1
G5P700A	2:1 or better (more pure water per litre)

Verdict: G5P700A is significantly more efficient

The G5P700A produces more clean water per litre of waste, making it:

• cheaper to run over time
• better for heavy‑use households
• more environmentally friendly

If you’re in a hard‑water area or use a lot of filtered water daily, the G5P700A’s efficiency advantage becomes noticeable within the first year.

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Noise Levels

Both systems are quiet during operation, producing only a soft “whirr” as the internal pump activates. However, the G5P700A benefits from Waterdrop’s newer pump design and improved internal damping.

Model	Noise Level
G3P600	50–55 dB
G5P700A	45–50 dB

Verdict: G5P700A is noticeably quieter

The G5P700A runs with a smoother, softer sound — similar to a fridge turning on. The G3P600 isn’t loud, but you’ll hear a slightly sharper pump tone when filling larger containers.

If your RO system sits close to a living space or you’re sensitive to noise, the G5P700A is the better choice.

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Installation & Maintenance

Both the G3P600 and G5P700A are designed to fit neatly under a standard UK kitchen sink, and both use Waterdrop’s simple front‑loading filter system. Installation is straightforward whether you’re doing it yourself or hiring a plumber.

What Both Models Have in Common

• Fit under most UK kitchen sinks
• Use push‑fit connectors to reduce leak risk
• Front‑facing filters for quick replacements
• Clear installation instructions
• No tank required (saves space)

Key Differences

• G3P600 is slightly simpler with fewer smart features
• G5P700A includes smart LED indicators for filter life and system status
• G5P700A has a more refined internal layout, making maintenance easier long‑term

Verdict: Both are easy — G5P700A is more user‑friendly

If you want the simplest setup possible, the G3P600 is marginally more basic. If you want clearer monitoring, smarter alerts, and a more modern interface, the G5P700A is the better experience.

Tip: If your plumbing has sediment, rust, or limescale, pairing either system with a whole‑house sediment filter will extend RO membrane life and improve performance.

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Running Costs

Although both systems use similar composite filters, the G5P700A benefits from a newer membrane design and longer‑lasting cartridges. Over a full year of use, the difference is small — but over 5–7 years, it adds up.

Model	Annual Filter Cost (Approx.)
G3P600	£120–£150
G5P700A	£110–£140

Verdict: G5P700A is slightly cheaper to run long‑term

The G5P700A’s filters typically last longer between changes, and the improved waste‑water ratio means less strain on the RO membrane.

If you’re planning to keep your RO system for several years, the G5P700A offers the lowest lifetime cost despite the higher upfront price. Replacement costs matter long-term — here’s a breakdown of Waterdrop replacement cartridges available in the UK

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Price Comparison (Typical UK Pricing)

The G3P600 and G5P700A sit in different price brackets, but both offer strong value for what they deliver. The G3P600 is the more affordable entry point, while the G5P700A costs more upfront but saves money over time through better efficiency and longer‑lasting filters.

Model	Price
G3P600	£350–£430
G5P700A	£450–£550

Verdict: G3P600 wins on upfront cost — G5P700A wins on long‑term value

If you’re on a tighter budget, the G3P600 is the best-value RO system Waterdrop offers. If you want the fastest flow, lowest running costs, and best efficiency, the G5P700A justifies the higher price.

Most UK families will save more over 5–7 years with the G5P700A thanks to:

• quieter operation
• lower wastewater
• longer filter life
• faster flow (less waiting)

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Side‑by‑Side Comparison

Below is a quick visual comparison of the two systems so you can see the key differences at a glance.

Core Differences at a Glance

Feature	G3P600	G5P700A
Flow Rate	600 GPD	700 GPD
Waste Ratio	1:1	≈2:1
Noise Level	50–55 dB	45–50 dB
Filter Life	Standard	Longer‑lasting
Smart Features	Basic	LED indicators + upgraded interface
Upfront Price	Lower	Higher
Running Costs	Slightly higher	Slightly lower
Best For	Small households	Families & heavy users

Quick Interpretation

• G3P600 = Best value for smaller households
• G5P700A = Best performance for families and long‑term use

Both systems fit under a standard UK kitchen sink and produce identical water purity — the differences are in speed, noise, efficiency, and usability.

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When to Choose Each Model

For homeowners deciding between RO systems, my guide to the best reverse osmosis systems in the UK covers all major models. If you’re unsure whether RO or carbon filtration is best, this article comparing reverse osmosis vs carbon filters will help.

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Final Verdict: Which Waterdrop System Should You Buy?

Both the Waterdrop G3P600 and G5P700A are excellent tankless RO systems — but they’re designed for different types of households.

If you want the best value, the G3P600 delivers outstanding filtration at a lower upfront price. It’s compact, reliable, and ideal for smaller homes that don’t need the fastest flow rate.

If you want the best performance, the G5P700A is the clear winner. It’s faster, quieter, more efficient with wastewater, and cheaper to run over the long term. For most UK families, it’s the better investment over 5–7 years.

Simple Recommendation

• Choose the G3P600 if you want premium RO filtration at the lowest cost.
• Choose the G5P700A if you want the fastest, quietest, most efficient system Waterdrop offers in this size.

Most UK households will be happiest with the G5P700A thanks to its speed, efficiency, and long‑term running cost advantage.

You’ll be taken directly to the Waterdrop G5P700A or G3P600 product page on the official UK store. Buying direct from Waterdrop UK often includes a longer warranty and faster customer support.

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FAQs for Waterdrop G3P600 vs G5P700A (2025 Comparison)

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Pros & Cons

Waterdrop G3P600 — Pros & Cons

Waterdrop G5P700A — Pros & Cons

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