Waterdrop G2P600 review
Waterdrop G2P600 RO Water Filtration System, 600 GPD Tankless Filter
By Tom Calder
A capable, keenly-priced entry point into tankless RO — noticeably improves taste and clarity, and the 2:1 pure-to-drain ratio is efficient by RO standards. It's a proper plumbed install rather than a jug swap: WRAS approval isn't stated for this unit, so fit it with the check-valve/backflow protection the Water Supply (Water Fittings) Regulations 1999 require for any plumbed-in device — ideally via a WaterSafe-registered plumber.
- Best for
- Households wanting a compact, tankless under-sink RO system to sort taste, hardness scale and lead-pipe reassurance (pre-1970 homes) without a bulky reservoir.
- Skip it if
- You're renting, can't drill a faucet hole or access a kitchen drain, or you want mineral-restored…
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Tankless design saves roughly 70% of the cabinet space a tanked RO system needs
- NSF/ANSI 372 certified lead-free build, and an efficient 2:1 pure-to-drain ratio — roughly a third of the input water goes to drain, still better than most RO systems
- Simple filter-life tracking (time or gallon-based) and a mechanical faucet included in the box
Worth knowing
- No remineralisation stage in this base model — RO strips out calcium and magnesium as well as contaminants, leaving water tasting flat and slightly acidic; a separate remineraliser is extra cost
- Needs a dedicated faucet hole and drain saddle, so installation is more involved than a countertop or jug filter
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Our review
Waterdrop's entry-level tankless reverse-osmosis unit: seven filtration stages packed into two composite cartridges, up to 600 US gallons (about 2,270 litres) a day, a 2:1 pure-to-drain ratio and a plain mechanical tap. What matters most is what has been left out: no mineral stage, no TDS display, and only an NSF/ANSI 372 lead-free materials certificate rather than performance certification. For households that want RO-grade water at the lowest upkeep and can live with the flat taste.
What it is
Two cartridges do everything. Waterdrop counts seven stages across them, ending at the reverse-osmosis membrane, and rates the output at 600 gallons a day, or 0.42 gallons a minute, about 1.6 litres a minute; it says an 8 oz cup fills in eight seconds. The cabinet is 44 cm by 15 cm by 35.5 cm and, on Waterdrop's UK figure, 11.5 kg. The tap is a mechanical one, without the TDS display of the dearer models.
On certification, read the small print. The G2P600 carries NSF/ANSI 372, which certifies that the materials are lead-free; it does not carry NSF/ANSI 58, the standard that tests how well an RO system actually reduces contaminants. Waterdrop lists PFOA and PFOS, lead, fluoride, arsenic, chromium VI, nitrates and more as reduced, but for this model those are maker claims, not independently certified ones. Waterdrop's own comparison table lists NSF/ANSI 372 alone for the G2P600, against 42, 53, 58 and 372 for the G3P600.
In a British kitchen
The pump makes it tolerant of UK pressure: Waterdrop's specification gives 14.5 to 87 psi (1 to 6 bar) at the inlet. Ofwat's legal minimum at your boundary is 0.7 bar, so measure if your pressure is known to be poor. Installation needs a cold-feed connection, a drain saddle on the waste pipe and a socket within reach of the 1.5 m power lead; Waterdrop says 30 minutes without tools. WRAS approval is not stated, so backflow protection under the Water Fittings Regulations is your responsibility; a WaterSafe plumber removes the doubt.
Noise is modest: Waterdrop says the pump stays under 60 dB while dispensing, and with no tank it only runs when you draw water.
Taste is the honest caveat. RO strips calcium and magnesium along with the rest, and with no mineral stage the water tastes flat to many people. Waterdrop sells an inline remineralisation cartridge (the MNR35, 12 months or 1,100 gallons) that it lists as fitting the G2P600, which closes the gap at the cost of one more thing to change.
When the power goes off
Like every tankless RO unit, it stops in a power cut: the pump needs the mains and there is no reservoir. The ordinary cold tap carries on, and UK tap water is safe to drink unfiltered (see is UK tap water safe), so treat this as a convenience filter, not emergency kit.
How it compares
The G3P600 is the same 600-gallon, 2:1 idea with eight stages, a TDS-and-filter-life tap and IAPMO R&T certification to NSF/ANSI 42, 53 and 58; it is heavier at 14.7 kg and its pre-filter is on a six-month clock rather than twelve. The G5P700A adds the mineral stage and 700 gallons a day. Away from RO, Waterdrop's own TSA three-stage carbon unit handles taste and chlorine with no pump, no drain and no waste water, and keeps working in a power cut.
Living with it
Running cost is this unit's strongest card. The G2CF pre-filter is rated at 12 months or 1,100 gallons (about 4,160 litres) and the G2P6MRO membrane at 24 months or 3,300 gallons (about 12,490 litres), so a typical year needs one pre-filter and half a membrane, against two pre-filters and a carbon block on the G3P600. Both change from the front without tools, Waterdrop says, in seconds. Warranty is one year for manufacturing defects, with 30-day returns from the UK store.
Our verdict
Buy it if you want reverse osmosis at the lowest ongoing cost, you have a drain and socket under the sink, and you either like RO water plain or are happy to add a mineral cartridge. Spend more on the G3P600 if you want the performance certificates and the smart tap, or on the G5P700A if taste is the point. Do not buy it, or any RO system, for chlorine taste alone, and do not expect it to help in an outage.
A researched review, built from the maker's specs, manual and UK listings; facts checked 21 Oct 2026. Sources: Waterdrop G2P600 product page (Waterdrop UK); Waterdrop G2P600 specifications (Waterdrop US); Waterdrop MNR35 remineralisation filter (compatibility list); Ofwat: water pressure and the guaranteed standards scheme.
Who shouldn't buy this
Don't buy it if you're renting, can't drill a faucet hole or access a kitchen drain, or you want mineral-restored water without buying a separate remineraliser stage.
Key specs
| Filter technology | 7-stage RO + carbon filtration |
| Filter life | Pre-filter ~12 months/1,100 gal |
| Flow rate | 600 GPD (~0.42 GPM), approx. 2,271 L/day |
| Installation | Tankless, under-sink |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Renters and homeowners who want better-tasting, chlorine-free tap water fast, without drilling a tap hole or fitting a drain line.
as of 5 Nov 2026, 22:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Hard-water households who want a compact, tankless under-sink RO system with alkaline remineralisation and have a spot with mains power and a drain nearby.
as of 5 Nov 2026, 22:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for Hard-water households who want compact, tankless under-sink filtration and don't mind the plumbed install.
as of 5 Nov 2026, 22:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Questions
Does the Waterdrop G2P600 add minerals back?
No. This model has no remineralisation stage, so calcium and magnesium removed by the membrane stay removed. Waterdrop's MNR35 inline cartridge can be added after the unit, or the G5P700A has the stage built in.
How loud is the Waterdrop G2P600?
Waterdrop says the pump's noise level while dispensing is less than 60 dB. Being tankless, it only runs while you draw water, so there is no standing hum.
What water pressure does the Waterdrop G2P600 need?
Waterdrop specifies 14.5 to 87 psi (1 to 6 bar) at the inlet. The built-in pump does the rest, which is why it copes with low UK pressure better than a passive RO system; very weak supplies should still be measured first.
Does the Waterdrop G2P600 work in a power cut?
No. The pump needs mains electricity and there is no storage tank, so the filtered tap gives nothing until the power is back. Your normal cold tap is unaffected.
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