Viqua PRO20

Last updated: November 2, 2026

Viqua PRO20

The certified pick for a large home or a small business on a private well. It costs a lot, but the dose is measured and certified.

  • 20 GPM at 40 mJ/cm²Flow
  • Class ANSF/ANSI 55
  • MercuryLamp
  • 5 yearsWarranty
Check price at Amazon$3,840

Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • Certified by NSF to NSF/ANSI 55 Class A at a full 20 GPM, enough for a large home
  • UV sensor plus flow meter show the real dose, and a plug in valve can stop water if it drops
  • Amalgam lamp lasts about two years between changes
  • 5 year controller and 10 year chamber warranty
Cons
  • Priced for professional installs, several times a budget 24 GPM unit
  • Must be mounted vertically, and the 31 in chamber needs clearance above it for lamp changes
  • The shutoff valve is sold separately

The Viqua PRO family

Every Viqua PRO model we rank, smallest first. Ratings compare each against its own flow.

ModelFlowRatingPrice
Viqua PRO1010 GPM at 40 mJ/cm²3.4/5$3,174.98
Viqua PRO20 (this one)20 GPM at 40 mJ/cm²3.6/5$3,840
Viqua PRO3030 GPM at 40 mJ/cm²3.6/5$5,030

How it scores

The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its flow. How we rank explains each one.

Specifications

Model number650653
Disinfection
Rated flow20 GPM at 40 mJ/cm²
NSF/ANSI 55Class A
LampMercury
Lamp power140 W
Lamp life18,000 hours
Monitoring
UV intensity sensorYes
Lamp failure alarmYes
Lamp change countdownYes
Shutoff valveYes
Build
Chamber316L stainless steel
Ports1.2 in
Maximum pressure125 psi
Voltage120 V
Warranty5 years

Alternatives in this flow

Viqua VH410M

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 $1,310
$1,310

Compare

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