SLF Water Filtration Comparison at Best Buy · 2026
Waterdrop G3P800
A strong premium choice for larger households that want substantially more output than the G3P600 while keeping a tankless footprint and adding built-in UV sterilization.
Waterdrop X8
A strong premium choice for families that want 800 GPD tankless RO performance, robust certification, and smart TDS monitoring without stepping up to the much more expensive X12 or X16.
Depends on Your Priorities
The measurable advantages are split in this matchup, so the better choice depends on the features you value most.
RO Performance & Ownership
Compare RO output, filtration stages, remineralization, contaminant evidence, certifications and ownership cost.
Which Is Right for You?
Waterdrop G3P800
Best for: Large households, high daily water use, tankless under-sink installations, PFAS concerns, and shoppers wanting UV plus smart water-quality monitoring.
Consider if: High Daily Output, Want TDS Display
Waterdrop X8
Best for: Families and higher-use households wanting certified tankless RO filtration with 800 GPD output and smart TDS monitoring.
Consider if: Want TDS Display
Our Recommendation
Waterdrop G3P800
The Waterdrop G3P800 is worth considering for high-use households that want a premium tankless RO system with fast output, UV sterilization and smart monitoring. Its biggest drawbacks are price and the lack of built-in remineralization on the standard model.
Waterdrop X8
The Waterdrop X8 is best for households wanting a premium but not flagship-priced tankless RO system. Its 800 GPD output, smart TDS faucet and NSF/ANSI 42/58/372 certification make it a strong step up from Waterdrop's value-oriented G-series.
The Short Answer
Choose the G3P800 if you want 800 GPD, UV sterilization and a more efficient 3:1 pure-to-drain ratio; choose a lower-capacity system if price matters more than maximum output.
Choose the X8 when you want premium certification and smart monitoring at 800 GPD but do not need alkaline remineralization.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, Waterdrop G3P800 or Waterdrop X8?
There is no single winner for every household. The current SLF records show meaningful trade-offs, so the better choice depends on filtration, output, installation, features and ownership cost.
Which system has the higher daily filtration capacity?
Both systems have the same rated output in the current SLF records.
Which system offers remineralization?
Both systems are listed as no for remineralization in the current SLF records.
Which system has the lower MSRP?
Waterdrop X8 has the lower MSRP in the current SLF records at $799.00, compared with $999.00 for the other system.
Do both systems require a plumbing connection?
Waterdrop G3P800: Yes. Waterdrop X8: Yes.
Which system is more renter friendly?
Waterdrop G3P800: No. Waterdrop X8: No. Check lease and plumbing-modification rules before installing an under-sink system.
What certifications are listed for these systems?
Waterdrop G3P800: Waterdrop states the G3P800 is certified to NSF/ANSI 42, 53, 58 and 372. IAPMO R&T certification is cited for applicable NSF/ANSI standards. Waterdrop X8: Waterdrop states the X8 system is certified by IAPMO R&T against NSF/ANSI 42 and 58 for reduction claims specified on the Performance Data Sheet and to NSF/ANSI 372 for low lead.
How do estimated annual filter costs compare?
Waterdrop G3P800: $159.97. Waterdrop X8: $161.97. Actual replacement timing and prices can vary.
