Viqua VP600
#5 in Over 12 GPMFull review
A plain high flow Viqua for large homes that don’t need a sensor, at well under the price of the certified PRO units. Add the VP600M if you want monitoring.
Amazon $1,230$1,230
The Viqua VP600 is the better UV water purifier overall, rated 2.7 to 2.6. The Viqua VP600 leads on certification. The HQUA TWS-24S costs $730.01 less ($499.99 vs $1,230).
HQUA TWS-24S
#6 in Over 12 GPMFull review
A cheap high flow unit for a large home that wants a UV backstop in a small space. The rating is unverified, so size it generously.
Amazon $499.99$499.99
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Viqua VP600 for certification (not NSF/ANSI 55 certified; flow rated at a stated 40 mJ/cm² dose vs not NSF/ANSI 55 certified, and no UV dose published).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every over 12 GPM UV water purifier; a clear win is highlighted. How we rank explains each one.
| Factor weight | Viqua VP600 | HQUA TWS-24S |
|---|---|---|
| Overall rating | 2.7/5 | 2.6/5 |
| Value 25% | 55 $68.33 per GPM ($1,230, 18 GPM at 40 mJ/cm²) | 65 $52.08 per GPM ($499.99, 9.6 GPM at 40 mJ/cm², from 24 GPM at an unstated dose taken as 16) |
| Certification 20% | 30 not NSF/ANSI 55 certified; flow rated at a stated 40 mJ/cm² dose | 0 not NSF/ANSI 55 certified, and no UV dose published |
| Monitoring 20% | 40 lamp failure alarm, lamp change countdown | 50 monitoring not published (neutral score used) |
| Lamp life 10% | 6 9,000 hour mercury lamp | 50 lamp life not published (neutral score used) |
| Warranty 25% | 22 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Viqua VP600 | HQUA TWS-24S | |
|---|---|---|
| Disinfection | ||
| Rated flow | 18 GPM at 40 mJ/cm² | 24 GPM |
| NSF/ANSI 55 | No | No |
| Lamp | Mercury | Mercury |
| Lamp power | 58 W | 80 W |
| Lamp life | 9,000 hours | - |
| Monitoring | ||
| UV intensity sensor | No | - |
| Lamp failure alarm | Yes | - |
| Lamp change countdown | Yes | - |
| Shutoff valve | No | - |
| Build | ||
| Chamber | 304 stainless steel | 304 stainless steel |
| Ports | 1 in | 1 in |
| Maximum pressure | 125 psi | - |
| Voltage | 120 V | 120 V |
| Warranty | 3 years | - |