Viqua PRO10
#1 in Up to 12 GPMFull review
For a home whose well, lender or health department needs a certified Class A system. Overkill for a cabin that just wants a budget backstop.
Amazon $3,174.98$3,174.98
The Viqua PRO10 is the better UV water purifier overall, rated 3.4 to 2.4. The Viqua PRO10 leads on certification, warranty and lamp life. The HQUA TWS-12 costs $2,914.99 less ($259.99 vs $3,174.98).
HQUA TWS-12
#5 in Up to 12 GPMFull review
A compact budget unit for a tight utility room, with cheap lamps. Like other budget units it tells you little about the dose.
Amazon $259.99$259.99
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 PRO10 for certification (NSF/ANSI 55 Class A vs not NSF/ANSI 55 certified, and no UV dose published), warranty (5-year warranty vs 1-year warranty) and lamp life (18,000 hour mercury lamp vs 9,000 hour mercury lamp).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 12 GPM UV water purifier; a clear win is highlighted. How we rank explains each one.
| Factor weight | Viqua PRO10 | HQUA TWS-12 |
|---|---|---|
| Overall rating | 3.4/5 | 2.4/5 |
| Value 25% | 0 $317.50 per GPM ($3,174.98, 10 GPM at 40 mJ/cm²) | 63 $54.16 per GPM ($259.99, 4.8 GPM at 40 mJ/cm², from 12 GPM at an unstated dose taken as 16) |
| Certification 20% | 100 NSF/ANSI 55 Class A | 0 not NSF/ANSI 55 certified, and no UV dose published |
| Monitoring 20% | 100 UV intensity sensor, lamp failure alarm, shutoff valve, lamp change countdown | 50 monitoring not published (neutral score used) |
| Lamp life 10% | 44 18,000 hour mercury lamp | 6 9,000 hour mercury lamp |
| Warranty 25% | 44 5-year warranty | 0 1-year warranty |
Specifications
| Viqua PRO10 | HQUA TWS-12 | |
|---|---|---|
| Disinfection | ||
| Rated flow | 10 GPM at 40 mJ/cm² | 12 GPM |
| NSF/ANSI 55 | Class A | No |
| Lamp | Mercury | Mercury |
| Lamp power | 100 W | 55 W |
| Lamp life | 18,000 hours | 9,000 hours |
| Monitoring | ||
| UV intensity sensor | Yes | - |
| Lamp failure alarm | Yes | - |
| Lamp change countdown | Yes | - |
| Shutoff valve | Yes | - |
| Build | ||
| Chamber | 316L stainless steel | - |
| Ports | 1.2 in | 0.8 in |
| Maximum pressure | 125 psi | - |
| Voltage | 120 V | 120 V |
| Warranty | 5 years | 1 year |