On AquaTru's published figures, the Carafe is narrower and cheaper to buy, and the Classic makes more water per day, has a higher stated efficiency and has filters rated for twice the gallons. Light users in tight kitchens may lean toward the Carafe. At about 2 gallons a day or more, the Classic works out cheaper over three years at the prices we checked. We haven't tested either one.
The main differences
AquaTru’s short version is to choose the Carafe for compact spaces and one or two people, and the Classic for larger countertop capacity. The documents back that up, and they add a cost difference that the short version leaves out.
Published specifications
| Specification | AquaTru Classic | AquaTru Carafe |
|---|---|---|
| Size (W x D x H) | 12 x 14 x 14 in[1] | 7.5 x 14 x 13 in[2] |
| Weight | About 17 lb[1] | About 9 lb[2] |
| Treated water held | 0.75 gal[1] | 0.5 gal[2] |
| Tap water tank | 1 gal[3] | 0.66 gal[2] |
| How you get the water | Push-button dispenser[1] | Removable 64 oz borosilicate glass carafe[2] |
| Power | 120 V, 60 Hz wall plug[4] | 120 V, 60 Hz wall plug[5] |
| Plumbing connection | None required[1] | None required[2] |
| Rated flow | 0.06 gal/min[4] | 0.042 gal/min[5] |
| Daily production rate | 54 gal/day[4] | 35 gal/day[5] |
| Efficiency rating | 75%[4] | 63%[5] |
| Maximum TDS of feed water | 1,500 mg/L[4] | 1,500 mg/L[5] |
| Maximum hardness of feed water | 10 gpg (171 mg/L)[4] | 10 gpg (171 mg/L)[5] |
| Maximum chlorine in feed water | Under 2 ppm[4] | Under 2 ppm[5] |
| Water temperature | 39–100 °F, cold water only[4] | 39–100 °F, cold water only[5] |
- AquaTru Classic, size (w x d x h): An undated AquaTru specification sheet hosted by a retailer lists 11.5 in wide and 16.3 lb. We use the current product page.
- AquaTru Classic, tap water tank: From an undated manufacturer sheet. The current product page does not state tap-tank size.
- AquaTru Carafe, rated flow: The previous 10.24.R3 data sheet listed 0.0317 gal/min. We use the newer 09.25.R5 sheet.
- AquaTru Carafe, daily production rate: The 2022 owner's manual says 54 gal/day. We use the newer data sheet.
- AquaTru Carafe, efficiency rating: The 2022 owner's manual describes about 3/4 gallon of treated water per gallon of tap water. The data sheet and AquaTru's FAQ both state 63%.
Sources for this table (5)
- AquaTru Classic product page, AquaTru. Accessed November 2, 2026.
- AquaTru Carafe product page, AquaTru. Accessed November 2, 2026.
- AquaTru Model AT2000, AT2010 Specifications, hosted by The Home Depot, AquaTru. Accessed November 2, 2026.
- AquaTru Countertop Model Performance Data Sheet, AquaTru, version 10.24.R4. Accessed November 2, 2026.
- AquaTru Carafe Model Performance Data Sheet, AquaTru, version 09.25.R5. Accessed November 2, 2026.
Several of these values come with caveats, listed under the table. These are the differences most likely to matter:
- Width. The Carafe is 4.5 inches narrower. Depth and height are similar, so don’t count on saving much in those directions.
- Output. The Classic’s stated output and flow are higher. Either figure well exceeds what most homes would treat in a day, so the time to fill a tank matters more in daily use.
- How you get the water. The Classic has a push-button dispenser. The Carafe has a removable glass carafe that AquaTru describes as fridge-friendly.
- Stated efficiency. The sheets list 75% for the Classic and 63% for the Carafe, which is about 1.33 and 1.59 gallons of tap water per treated gallon.
Neither model’s sheet tells you it will work well in your water. Both share the same limits on what goes in, including hardness, as the table shows. If your water is harder than that, read AquaTru’s own warning about scale first.
Certification and reduction claims
Both data sheets state certification by IAPMO R&T for NSF/ANSI 42, 53, 58, 372 and 401 claims. On November 2, 2026, we searched the IAPMO R&T directory for the listed models AT2000 and AT100. Both returned active AquaTru, LLC files for those standards. The directory’s search appears to match partial text, and we didn’t open each file, so check your exact model number before relying on this.
One conflict to note: AquaTru’s FAQ still described the Carafe’s certification as pending when we checked. The newer data sheet and the directory results suggest the FAQ is out of date, but we can’t confirm that from AquaTru itself.
Selected certified reduction claims, as reported on each data sheet
| Substance | AquaTru Classic | AquaTru Carafe |
|---|---|---|
| Lead | Average reduction 99.1%. Minimum reduction 97.5%. Allowed in treated water: 0.010 mg/L. Test challenge: 0.15 mg/L ±10%. NSF/ANSI 58[1] | Average reduction 99.2%. Minimum reduction 98%. Allowed in treated water: 0.005 mg/L. Test challenge: 0.15 mg/L ±10%. NSF/ANSI 58[2] |
| PFOA and PFOS | Minimum reduction 97.5%. Allowed in treated water: 0.02 µg/L. Test challenge: 1.5 µg/L ±10%. NSF/ANSI 53[1] | Average reduction 99.9%. Allowed in treated water: 0.02 µg/L. Test challenge: 1.5 µg/L ±20%. NSF/ANSI 53 and 58[2] |
| Fluoride | Average reduction 93.5%. Minimum reduction 91.8%. Allowed in treated water: 1.5 mg/L. Test challenge: 8 mg/L ±10%. NSF/ANSI 58[1] | Average reduction 96.4%. Minimum reduction 94.2%. Allowed in treated water: 1.5 mg/L. Test challenge: 8 mg/L ±10%. NSF/ANSI 58[2] |
| Hexavalent chromium | Average reduction 97.2%. Minimum reduction 94.3%. Allowed in treated water: 0.10 mg/L. Test challenge: 0.30 mg/L ±10%. NSF/ANSI 58[1] | Average reduction 97.5%. Minimum reduction 90.1%. Allowed in treated water: 0.1 mg/L. Test challenge: 0.3 mg/L ±10%. NSF/ANSI 58[2] |
| Free available chlorine | Average reduction 97%. Test challenge: 2.0 mg/L ±10%. NSF/ANSI 42[1] | Average reduction 96.8%. Test challenge: 2.0 ppm ±0.2. NSF/ANSI 42[2] |
| Microplastics, 0.5 to under 1 µm | Average reduction 96.48%. Test challenge: 1,400,000 particles/mL. NSF/ANSI 401[1] | Average reduction 98.96%. Test challenge: 8,500,000 particles/mL. NSF/ANSI 401[2] |
- Laboratory results reported by the manufacturer. Actual performance varies, and not every substance is present in every water supply.
- The two data sheets report different statistics for some rows, so differences of a point or two are not evidence that one model performs better in your home.
Sources for this table (2)
- AquaTru Countertop Model Performance Data Sheet, AquaTru, version 10.24.R4. Accessed November 2, 2026.
- AquaTru Carafe Model Performance Data Sheet, AquaTru, version 09.25.R5. Accessed November 2, 2026.
Read these for what they are. Each number is from a laboratory test under set conditions, reported by the manufacturer. They aren’t a measure of what you’d get at home, and NSF cautions that certification doesn’t cover every possible contaminant. The sheets don’t always give the same statistic, so small differences don’t show that one model is better. We left nitrate plus nitrite out of the table: the Carafe sheet shows a minimum reduction above its average, which can’t both be right as printed. Consult the Classic and Carafe sheets directly, and ask AquaTru, if nitrate matters to you.
The Classic’s data sheet also says AquaTru may not remove all contaminants, and that it shouldn’t be used with microbiologically unsafe water without disinfection.
Three-year cost
Prices for the Classic’s filters and the Carafe’s filters matched when we checked, but the Carafe’s are rated for half the gallons. So its cost climbs faster with use. The filter limits come from each part’s page: Classic VOC and RO, and Carafe VOC and RO.
Filter purchases and cost over 3 years, by daily use
| Assumption | AquaTru Classic | AquaTru Carafe |
|---|---|---|
| Purchase price | $475.00[1] | $375.00[2] |
| Rated filter life, whichever comes first | Pre/Carbon: 6 months or 600 gal; VOC Carbon: 12 months or 600 gal; Reverse Osmosis: 24 months or 1,200 gal[3][4][5] | Pre/Carbon: 6 months or 300 gal; VOC Carbon: 12 months or 300 gal; Reverse Osmosis: 24 months or 600 gal[6][7] |
| Replacement filter prices | Pre/Carbon: $29.95; VOC Carbon: $39.95; Reverse Osmosis: $59.95[3][4][5] | Pre/Carbon: $29.95; VOC Carbon: $39.95; Reverse Osmosis: $59.95[8][9][7] |
| Using 0.5 gal/day | 3-year total $764.60Filter spend $289.60: 5 Pre/Carbon, 2 VOC Carbon, 1 Reverse Osmosis | 3-year total $664.60Filter spend $289.60: 5 Pre/Carbon, 2 VOC Carbon, 1 Reverse Osmosis |
| Using 1 gal/day | 3-year total $764.60Filter spend $289.60: 5 Pre/Carbon, 2 VOC Carbon, 1 Reverse Osmosis | 3-year total $704.55Filter spend $329.55: 5 Pre/Carbon, 3 VOC Carbon, 1 Reverse Osmosis |
| Using 2 gal/day | 3-year total $804.55Filter spend $329.55: 5 Pre/Carbon, 3 VOC Carbon, 1 Reverse Osmosis | 3-year total $1,044.15Filter spend $669.15: 7 Pre/Carbon, 7 VOC Carbon, 3 Reverse Osmosis |
| Using 4 gal/day | 3-year total $1,144.15Filter spend $669.15: 7 Pre/Carbon, 7 VOC Carbon, 3 Reverse Osmosis | 3-year total $1,773.25Filter spend $1,398.25: 14 Pre/Carbon, 14 VOC Carbon, 7 Reverse Osmosis |
- Each filter is replaced at its stated time limit or gallon limit, whichever comes first. The set that ships with the purifier covers the first interval.
- Excludes sales tax, shipping, electricity, tap water, descaling supplies and any early replacement caused by hard water or poor feed-water quality. Electricity is left out because neither manufacturer page we checked publishes wattage.
- Manufacturer list prices checked on November 2, 2026. Retail prices change: confirm before you buy.
Sources for this table (9)
- AquaTru Classic product page, AquaTru. Accessed November 2, 2026.
- AquaTru Carafe product page, AquaTru. Accessed November 2, 2026.
- Classic Pre/Carbon Filter, AquaTru. Accessed November 2, 2026.
- Classic VOC Carbon Filter, AquaTru. Accessed November 2, 2026.
- Classic Reverse Osmosis Filter, AquaTru. Accessed November 2, 2026.
- AquaTru Carafe Owner's Manual, AquaTru, version 08.22.R3. Accessed November 2, 2026.
- Carafe ONLY Reverse Osmosis Filter, AquaTru. Accessed November 2, 2026.
- Carafe ONLY Pre/Carbon Filter, AquaTru. Accessed November 2, 2026.
- Carafe ONLY VOC Carbon Filter, AquaTru. Accessed November 2, 2026.
Filters aren’t interchangeable: AquaTru says the Classic isn’t compatible with Carafe filters. For the method behind this table, and what it leaves out, see how to compare replacement-filter costs.
The daily routine
Both are fill-by-hand systems. You carry a tank to the sink, and you discard the leftover water at each refill, as the Classic and Carafe manuals describe. The Classic’s manual gives about 15 minutes to make a tank in normal use, and suggests RO replacement if it passes 30 minutes.
The manuals are older than the data sheets, and they can disagree with them. The Classic’s tap-tank size comes from an undated sheet, and the Carafe’s 2022 manual gives a daily output that doesn’t match its newer data sheet. Where they conflict, we use the newer document and note the difference.
Which one fits your home?
The Carafe may suit you if:
- Counter width is your tightest limit.
- One or two people use it, mostly for drinking.
- You’d like to keep a glass carafe in the fridge.
The Classic may suit you if:
- You use about 2 gallons a day or more, or expect to.
- You’d rather have a push-button dispenser than a carafe.
- You can give up another 4.5 inches of counter.
Consider neither if:
- Your water report doesn’t show a problem you want to solve. The choosing guide covers this question first.
- Your water’s hardness is over the sheet’s limit and you won’t soften or descale.
- A refill routine won’t suit you. In that case, see countertop vs. under-sink.