12 GPM | D4 & Prefilters | UV Max | UV Water System | VIQUA HOME

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Viqua UV Max Home Ultraviolet Sterilizers

VIQUA UV MAX Prefiltration + UV Water Systems for Whole-Home

IHS12-D4 - 12 GPM - D4 Ultraviolet Sterilizer with 10" Sediment & 20" Carbon Filter with Lead Reduction
Ideal For: Bacteria, Chlorine, Lead, Turbidity/Cloudiness

VIQUA HOME Series Ultraviolet Disinfection Systems are specifically designed for point-of-entry water treatment in homes or light commercial applications where microbiological control is required. VIQUA UV MAX D4 compact UV disinfection systems provide a reliable, economical, and chemical-free way to safeguard drinking water in any residential application. Viqua UV Max IHS12-D4 series point of entry systems (also known as whole house systems) are intended to be plumbed in where your water enters your home.  

Product Specifications for VIQUA Point of Use Home Ultraviolet UV System Installation Instructions for VIQUA Point of Use Home UV System

VIQUA's UV MAX UV Drinking Water Systems are mounted on heavy duty, painted steel brackets and provide three stages of water treatment:
  • Stage 1:  10" 5 Micron Sediment Filter.   Removes Dirt, Rust, Sand, Grit, and other Suspended Solids from the water. In addition to providing cleaner water and protecting downstream equipment, sediment prefiltration before a UV system ensures optimal disinfection of the water.  Dirt, rust, or other suspended particles in water may block the transmission of the UV by giving microbes particles to "hide behind".    Removing these impurities  with sediment filtration increases the waters UVT (UV Transmittence), increasing effective transmission of the ultraviolet energy.
  • Stage 2: 20" High Flow Granular Activated Carbon (GAC) Filter Cartridge with Lead Reduction.  Carbon filtration provides absorbs chlorine, chlorine by-products, and lead from the water as well as removing unlpleasant tastes, odors and turbidty (cloudy water), resulting in clean, clear, and better tasting drinking water from every tap in your home.
  • Stage 3:  Viqua UVMax D4 Ultraviolet Water Disinfection System for 99.99% destruction of bacteria, virus & protozoan cysts (Giardia Lamblia & Cryptosporidium) at rated flow. Energy efficient, and chemical-free disinfection.

Features of UV Max D4 UV System:

  • Equipped to inactivate chlorine resistant parasites such as Cryptosporidium and Giardia, harmful bacteria like E.Coli, and viruses not visible to the naked eye.
  • The special lamp plug ensures that no one can power the UV lamp if it’s not in the UV chamber
  • Lamps and sleeves are assembled together for ease of handling. They can be replaced separately, in minutes and without tools.
  • Our high output UV lamp is engineered to maximize UV output.
  • Indicator lights show the status of system components and warning lights appear when system maintenance is required.
  • Standard controller features a countdown to annual lamp replacement, a countdown restart button, and a warning alarm silencing button.
  • Highly featured whole-home UV disinfection system with graphical interface designed for recommended flow rates up to 12 gpm (45 lpm)
  • Overall foot print is extremely compact due to advanced lamp/chamber technology
  • Visual "Power On" and "Lamp Life Remaining" Indicators.
  • Audible Lamp Failure Alarm and Lamp Replacement Reminder.


Specifications for IHS12-D4

UV Max Model: IHS12-D4
Recommended Flow Rate* 12 GPM (45 LPM)
UV System Included: VIQUA UV MAX D4
Prefilter Stage 1:
10" High Flow 5 Micron Sediment Filter for Dirt and Rust
Prefilter Stage 2:
20" High Flow Carbon Filter for Chlorine, Taste, and Odor Plus Lead Reduction
Plug: N. America (NEMA P-15)
Voltage: 100-240v/50-60Hz
Power Consumption: 50W
Connection: 3/4" FNPT/MNPT
System Dimensions: 25½" x 12" x 28"
Lamp Life: 9,000 Hours
Max. Operating Pressure: 125 psi (8.62 bar)
Ambient Water Temperature: 36-104ºF  (2-40°C)
Chamber Material: 304SS
Replaces Models:
Sterilight SC320-DWS12,
Sterilight SCM320-DWS12

*Factory recommended flow rate is calculated at a UV dose of 30 mj/cm².  See manufacturer's specification sheet for flow rates at different doses.

What Size of UV System do I need?

What Size of UV      
System Do I Need?    

Choose a UV System with a recommended flow that meets or exceeds your peak flow rate. When in doubt, always choose the next size up.

Don't know your flow rate?  

Visit our  Flow Rate & Sizing Guide for help.


UV MAX IHS12-D4 Controller

Controller: Standard
Visual "Power On": YES
Visual Lamp Life Remaining: YES
Audible Lamp Failure: YES
Audible Lamp Replacement Reminder: YES
UV Sensor: NO


Replacement Parts for IHS12-D4

602805 UV Lamp for D4 UV System
602732 UV Quartz Sleeve for D4
CMB-510-HF Sediment Filter for IHS12-D4

Carbon Filter with Lead Reduction for IHS12-D4
650733R-002 Controller for D4

Benefits of Ultraviolet Disinfection

  • 99.99% destruction of bacteria, virus & protozoan cysts (Giardia Lamblia & Cryptosporidium) at rated flow.
  • Chemical-free 
  • Easy to install and service
  • Economical and energy efficient

Viqua Whole House UV System Installation Diagram

Typical Installation of VIQUA UV Max IHS12-D4 Whole-House Ultraviolet Water Treatment System.  (Click to Enlarge.)

Note: The IHS12-D4 replaces the Sterilight SC320-DWS12 and SCM320-DWS12 systems.