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Sterilight S12Q-PA Ultraviolet (UV) Sterilizer

The Sterilight S12Q-PA Ultraviolet (UV) water sterilizer is a popular and economical choice for average whole house water purification to kill bacteria (including coliform and e.coli), viruses, cryptosporidium, giardia, and a wide range of other microbioogical contaminants, where the maximum required flow rate is not greater than 15.1 gallons per minute (GPM) or 57.0 litres per minute (LPM).

The Sterilight S12Q-PA (part of Sterilights's Silver Series) includes many poluar convenience features including a visual "lamp on" indicator light, audible lamp failure alarm, and LED display that indicates lamp life remaining and total controller run time. The S12Q-PA also features a stainless steel reactor chamber, a fire-polished domed quartz sleeve, and Sterilights' popular Sterilume™-EX coated low pressure germicidal UV lamp which can be easily changed without interrupting the water flow. It also incorporates Sterilight's Silver controller which automatically senses line voltage between 100 and 240 volts for consistent UV output and performance in varying electrical operating conditions.

This model does NOT include a UV intensity monitor and it CANNOT be connected to an emergency solenoid shut-off valve. If either of these features appeal to you, we recommend that you consider the Sterilight Silver Plus Series UV Sterilizers.

Sterilight S12Q-PA Specifications

Applications whole house (average house)
Max. Flow Rate
(UV dose >30,000 µWs/cm2)*
15.1 GPM (57.0 LPG)
Max. Flow Rate
(UV dose >40,000 µWs/cm2)*
11.1 GPM (42.0 LPM)
Water Chamber Material 304 Stainless Steel
Chamber Length 37.0 inches / 94.0 cm
Chamber Diameter 3.5 inches / 8.9 cm
Controller Size 7.3 x 3.2 x 2.5 inches
(19.0 x 8.1 x 6.4 cm)
Lamp Sterilume-EX
Model S36RL
Sleeve Quartz
Model QS-012
Electrical 100-240v, 50/60HZ
Power Consumption 48 watts
Lamp Power 39 watts
Inlet / Outlet Plumbing Ports Combo 3/4" FNPT, 1" MNPT
"Power-On" Indicator Light
Audible Lamp Failure Alarm
Lamp Replacement Reminder
LED Display: Lamp Life Remaining, Total Controller Runtime
Sterilight best price guarantee

US $499.00
+ free shipping

*Note: Maximum recommended flow rates based on 95% UV transmittance. Actual dosage depends on flow rate, water quality, and maintenance (cleaning ov UV sleeve). UV dosage will be lower when the UV transmittance capacity of the water drops below 95% - if in doubt, select a model rated for a higher flow rate than you actually require. We recommend a UV dose of not less than 30,000 µWs/cm2.

Pre-treatment Requirements:

All UV sterilizers required sediment pre-filtration to reduce or eliminate the possibility that a targeted contaminant could "hide" behind a sediment particle in the "shadow" of the UV light and therefore not receive a full dose of UV light. Accordingly, the manufacturer strongly recommends sediment pre-filtration down to a level of 5 microns or smaller.

Water exceeding 120 ppm in hardness (7 grains per gallon) should be softened to reduce the risk that hard water mineral scale will build-up on the UV sleeve thereby reducing UV light distribution into the UV chamber. Similarly, iron levels exceeding 0.3 ppm or manganese levels exceeding 0.05 ppm should also be treated to prevent staining of the UV sleeve.

Elevated levels of certain other contaminants, such as tannins, can cause a reduction in UV transmittance (the ability of the water to transmit UV light). If the UV transmittance (UVT) of your water is less than 75% after the above-mentioned pre-treatment, activated carbon filtration may be desirable to improve UV transmittance. The majority of deep wells have a UVT of 85% or greater. If your UVT is unknown, select a model with a higher flow rate capacity then you feel you will really require (this will provide a higher UV dose at your desired flow rate), or add an activated carbon pre-filter to your system. We recommend the following pre-filter equipment:
sediment pre-filter for UV sterilizer sediment and activated carbon pre-filter for UV system iron reduction filter
5 Micron Sediment
Pre-Filter Package

excellent overall sediment pre-treatment to 5 micron level
Sediment & Activated
Carbon Pre-Filter Package

sediment pre-treatment to 5 microns and improves UV transmittance by removing tannins and other contaminants that reduce UVT
Iron Reduction
Filter Package

very cost effective iron pre-treatment filter for iron levels ranging from 0.3 to 5.0 ppm


The Sterilight S12Q-PA can be equipped with a flow restrictor to ensure that you do not exceed the maximum flow capacity of the system. We recommend that you choose a flow restrictor rated for slightly less flow than the UV sterilizer based on a UV dose of 40,000 µWs/cm2. For more details, review our Sterilight flow restrictors page.

Recommended Flow Restrictors for S12Q-PA

Model Price
Sterilight FRSS-10 Flow Restrictor Sterilight
Flow Restrictor

10.0 GPM


1" x 1"
free shipping

Sterilight FRSS-12 Flow Restrictor Sterilight
Flow Restrictor

12.0 GPM


1" x 1"
free shipping

Sterilight FRSS-15 Flow Restrictor Sterilight
Flow Restrictor

15.0 GPM


1" x 1"
free shipping

Sterilight S12Q-PA UV Purifier

Sterilight S12Q-PA Silver Series brochure
S12Q-PA Silver Series Brochure

(Adobe PDF)
Sterilight S12Q-PA Silver Series Owners Manual
S12Q-PA Silver Series Owner's Manual

(Adobe PDF)

Sterilight S12Q-PA Certifications & Approvals

Feed Water Quality Parameters
Iron < 0.3 ppm
(0.3 mg/L)
Manganese < 0.05 ppm
(0.05 mg/L)
Tannins < 0.1 ppm
(0.1 mg/L)
Turbidity < 1 NTU
Hardness < 120 ppm
(7 grains / gallon)
UV Transmittance (UVT): > 75%
Maximum Temperature: 104F (40C)
Maximum Pressure: 125 psi

Sterilight S12Q-PA Warranty:

Reaction Chamber: 7 years
Lamp: 1 year
All Other components: 2 years

Replacement Parts:

Replacement UV Lamp for
Sterilight S12Q-PA

Sterilight S36RL Lamp

Sterilight S36RL Lamp

+ free shipping

Replacement Sleeve for S12Q-PA

Sterilight QS-012 Sleeve

Sterilight QS-012 Sleeve

+ $9.95 shipping

BACK to Sterilight Main Page

BACK to Sterilight
Silver Series Page

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