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 $3,174.98The Viqua PRO10 rates 3.4 among up to 12 GPM UV water purifiers; the Viqua VH410M rates 3.0 among over 12 GPM ones. The Viqua VH410M costs $1,864.98 less ($1,310 vs $3,174.98).

The monitored version of Viqua’s large home unit, for well owners who want to know the dose is actually being delivered. Worth the premium over the plain VH410 if no one checks the water regularly.
Amazon $1,310Prices 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.
Scores side by side
These two sit in different flow classes (up to 12 GPM and over 12 GPM), and each is scored against the reference points for its own class, so a rating says how well each does among its own flow peers. How we rank explains each factor.
| Factor weight | Viqua PRO10 | Viqua VH410M |
|---|---|---|
| Overall rating | 3.4/5 | 3.0/5 |
| Value 25% | 0 $317.50 per GPM ($3,174.98, 10 GPM at 40 mJ/cm²) | 43 $93.57 per GPM ($1,310, 14 GPM at 40 mJ/cm²) |
| Certification 20% | 100 NSF/ANSI 55 Class A | 30 not NSF/ANSI 55 certified; flow rated at a stated 40 mJ/cm² dose |
| Monitoring 20% | 100 UV intensity sensor, lamp failure alarm, shutoff valve, lamp change countdown | 100 UV intensity sensor, lamp failure alarm, shutoff valve, lamp change countdown |
| Lamp life 10% | 44 18,000 hour mercury lamp | 6 9,000 hour mercury lamp |
| Warranty 25% | 44 5-year warranty | 22 3-year warranty |
Specifications
| Viqua PRO10 | Viqua VH410M | |
|---|---|---|
| Disinfection | ||
| Rated flow | 10 GPM at 40 mJ/cm² | 14 GPM at 40 mJ/cm² |
| NSF/ANSI 55 | Class A | No |
| Lamp | Mercury | Mercury |
| Lamp power | 100 W | 46 W |
| Lamp life | 18,000 hours | 9,000 hours |
| Monitoring | ||
| UV intensity sensor | Yes | Yes |
| Lamp failure alarm | Yes | Yes |
| Lamp change countdown | Yes | Yes |
| Shutoff valve | Yes | Yes |
| Build | ||
| Chamber | 316L stainless steel | 304 stainless steel |
| Ports | 1.2 in | 1 in |
| Maximum pressure | 125 psi | 125 psi |
| Voltage | 120 V | 120 V |
| Warranty | 5 years | 3 years |