Waterdrop G3P800 vs G3P600:
Is the Upgrade Worth It?
Same brand, same tankless design — but the G3P800 adds NSF 53 certification, UV sterilisation, and a better waste ratio. I've used both systems. Here's whether the extra investment makes sense for your home.
Waterdrop Autumn Sale — 4–13 September
Featured RO systems: A2, A2G, A1, X12 and X16. Prices and availability can change.
Extra £300 off the G3P800 with our exclusive code — only available through Filter Authority.
Use code WDG3P800 at checkout on Waterdrop UK. Valid until 26 June 2026.
If you're comparing the Waterdrop G3P800 vs G3P600, you're looking at two compact tankless reverse-osmosis systems. The G3P800 costs more, so the sensible question is what evidence supports that upgrade. This comparison covers UV, stated water-efficiency and flow differences, plus the important distinction that the G3P800 has a current IAPMO R&T report naming Total PFAS, PFOA and PFOS results, while the G3P600's currently linked sheet does not name PFAS results. After 25 years working with RO systems, I'll tell you what that means in practical terms.
The Quick, Honest Verdict
The G3P800 is the better system — objectively. It has more certifications, better water efficiency, UV sterilisation, and faster flow. The question isn't "which is better?" — it's "is the upgrade worth £200-300 to you?"
For households making a PFAS-first decision, the G3P800's current named PFAS results are the meaningful distinction. For households primarily wanting better-tasting water without chlorine, the G3P600 may still be the better-value option — but verify its current model-specific claims for any health-related concern.
Upgrade to G3P800 If You...
- • Want current documentation naming Total PFAS, PFOA and PFOS results
- • Want UV sterilisation (bacteria/virus protection)
- • Are on a water meter (3:1 saves more water)
- • Have a larger family (800 GPD = faster refills)
- • Want the most comprehensive home protection
Stick with G3P600 If You...
- • Primarily want better-tasting water
- • Budget is the main constraint
- • Live alone or as a couple (600 GPD is plenty)
- • Don't have specific lead/bacteria concerns
- • Already own a G3P600 and it's working well
Head-to-Head: G3P800 vs G3P600
All specifications sourced from Waterdrop's official UK product pages and NSF certification records. GPD = Gallons Per Day (a measure of how much water the system can produce in 24 hours).
| Feature | G3P800 | G3P600 | Why It Matters |
|---|---|---|---|
| Flow Rate | 800 GPD | 600 GPD | Faster fill times — noticeable with large pots or multiple glasses |
| Pure-to-Drain Ratio | 3:1 | 2:1 | Less water waste — saves £15-25/year on a meter |
| Filtration Stages | 10 stages + UV | 8 stages | More stages = more layers of protection |
| UV Sterilisation | Kills 99% of bacteria & viruses — extra safety layer | ||
| NSF/ANSI 42 | Taste & odour (chlorine) — both have this | ||
| Current named PFAS results ⭐ | Total PFAS, PFOA & PFOS in IAPMO R&T report | Not named in currently linked sheet | Model-specific evidence matters when PFAS is your main concern |
| NSF/ANSI 58 | RO system standard — both certified | ||
| NSF/ANSI 372 | Low lead compliance — both pass | ||
| RO Membrane | 0.0001μm | 0.0001μm | Pore size is not a substitute for a model-specific PFAS performance result |
| Design | Tankless | Tankless | Both save 70% space vs traditional tank RO |
| Smart Faucet (TDS) | Real-time TDS monitoring on both | ||
| Installation | 30 min DIY | 30 min DIY | Same easy installation process |
| UK Price (current) | £699.99 | £399.99 | Waterdrop UK direct pricing |
| Award | Red Dot 2024 | — | Design recognition for the G3P800 |
Prices and product documentation can change. PFAS wording reflects the current model-specific performance documents reviewed in August 2026.
The Big Difference: Named PFAS Performance Evidence
Why This Matters
A certification number is only useful when you know what this exact model was tested for. NSF/ANSI 53 may support a health-related contaminant claim, but it does not automatically prove every possible lead, PFAS or VOC result for every system carrying the standard.
The G3P800's current IAPMO R&T document goes further for PFAS: it names Total PFAS, PFOA and PFOS results under its test conditions. The G3P600 product page says it helps reduce PFAS, but its currently linked performance sheet does not name PFAS results. That is the distinction worth acting on if PFAS is the reason you are buying.
What Each NSF Standard Actually Covers
Aesthetic effects — chlorine taste, odour, sediment. Makes water taste better. Both systems have this.
Health-effect claims — check the named contaminant in the current model-specific sheet. The G3P800's current report names Total PFAS, PFOA and PFOS; do not infer the same PFAS result for the G3P600.
Reverse osmosis standard — verifies the RO membrane works as claimed. Both systems have this.
Low lead compliance — the system itself doesn't leach lead into your water. Both pass.
UV Sterilisation: Do You Need It?
The G3P800 includes a built-in UV steriliser that kills 99% of bacteria and viruses. The G3P600 doesn't have this. But do you actually need it in the UK?
You Probably Want UV If...
- You have a private water supply (well/borehole)
- You've had boil water notices in your area
- You're immunocompromised or have young babies
- You want maximum peace of mind
- You remember the Brixham cryptosporidium outbreak
You Can Skip UV If...
- You're on mains water (already chlorinated)
- Your area has no history of contamination events
- Your primary concern is taste/chemicals, not bacteria
- Budget is tight and you'd rather save £200-300
Honest take: For most UK mains-connected homes, UV is a "nice to have" rather than essential. But if you're in an area that's had water quality incidents, or you have vulnerable family members, it's genuine added protection — not just marketing.
Water Waste & Running Costs
If you're on a water meter (and most UK households will be by 2030), the waste ratio matters for your bills.
Annual Water Waste Cost Comparison
Based on a family of 4 drinking 3 litres/day of filtered water. Average UK metered water cost: £4.50/m³.
G3P800 (3:1 ratio)
~£6/year
365 litres waste water annually
G3P600 (2:1 ratio)
~£9/year
548 litres waste water annually
The difference is roughly £3/year in water costs — not a deal-breaker. But over 10 years, the G3P800 wastes approximately 1,830 fewer litres. If you care about water conservation (or live in a drought-prone area), it adds up.
Filter Replacement Costs
| Filter | Lifespan | Cost |
|---|---|---|
| CF Filter (sediment/carbon) | 6 months | ~£30 |
| CB Filter (carbon block) | 12 months | ~£30 |
| RO Membrane | 24 months | ~£60-80 |
Replacement filter costs are similar for both systems — roughly £90-110 per year. The G3P800 and G3P600 share the same CF filter, so if you upgrade later, you won't waste existing stock.
Before You Buy Either System
Both the G3P800 and G3P600 are reverse osmosis systems. They need adequate water pressure to work properly. Here's what to check first:
- Check your water pressure. RO systems need 40-60 psi minimum. Average UK mains is 1-3 bar (14-43 psi) — this can be borderline. Buy a £10 pressure gauge from Amazon and test first.
- You need a power outlet under your sink. Both systems require electricity for the pump (and UV on the G3P800). No outlet? Budget £50-100 for an electrician.
- If your pressure is low, you'll need a booster pump (£40-80). This is common in flats, upper floors, and some rural areas.
My Honest Take (After 25 Years)
I've been working with reverse osmosis systems since 2001. I've installed tank-based systems, tankless systems, and everything in between. Here's my straight opinion:
The G3P800 is the system I'd start with for a PFAS-first comparison today. Not simply because it is more expensive, but because its current IAPMO R&T report names Total PFAS, PFOA and PFOS results under stated conditions. That is a much stronger basis for a PFAS decision than a general RO label or a broad marketing statement.
That said, the G3P600 may still suit a household seeking a compact, tankless RO system at a lower price. Waterdrop says it helps reduce PFAS, but I would not present it as an evidence-backed PFAS choice until its current performance sheet names the relevant PFAS results. It remains sensible to compare it for its documented taste, design and water-efficiency features.
Bottom line: If PFAS is your main concern, compare the G3P800's current named results with the product documents for any alternatives. If you want a compact tankless RO system for general filtration, the G3P600 may still be worth considering — but buy it for claims that are actually documented today.
Product images coming soon
High-resolution G3P800 lifestyle images will be added here
Ready to Upgrade Your Water?
Both systems ship free to UK addresses from Waterdrop's official UK store. 30-day returns, 1-year warranty.
Waterdrop G3P800
10-stage + UV | NSF 42, 53, 58, 372 | 800 GPD | 3:1 ratio
Links go to Waterdrop's official UK store (waterdropfilter.co.uk). We may earn a small commission at no extra cost to you. How we choose.
Disclaimer: All facts, figures, and specifications mentioned on this page are correct at the time of writing (June 2026) and sourced from Waterdrop's official UK product pages and published NSF/ANSI certification documentation. Prices may change during promotional periods. Filter Authority is an independent resource — we are not employed by Waterdrop. We may earn a commission on purchases made through our links at no extra cost to you. This does not influence our recommendations. Our methodology explains how we evaluate products.
A Simple Guide to Which Filter Type Usually Suits Which Concern
A simple guide to which filter type usually suits which concern.
Jug Filters
Typical price: £20-40Best for improving chlorine taste and odour, with no installation needed.
Under-Sink Carbon Filters
Typical price: £80-150A good middle-ground option for better taste, odour, sediment, and some chemical reduction.
Multi-Stage Under-Sink Systems
Typical price: £150-300Designed for broader reduction, but performance varies by model and certification.
Reverse Osmosis Systems
Typical price: £200-400A broader filtration option; for lead, PFAS, fluoride or microplastics, check the exact model's current performance evidence.
Whole-House Systems
Typical price: £500-2000+Best for protecting appliances and treating water throughout the home, rather than just at one drinking tap.
Most UK homes do well with a simple under-sink carbon filter or a reverse osmosis system, depending on the concern. If you are worried about lead pipes or broader contaminant reduction, start by comparing certified under-sink and RO options carefully.