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Viqua UVMax E4-50+ Whole House UV Sterilizer - #650638-R

for applications where water quality conditions result in less than ideal UV transmission (as low as 50% UVT) and where a UV intensity monitor is desired to ensure disinfection performance

Viqua UVMax Model E4-50+
UV Sterilizer (#650638-R)

The Viqua UVMax Model E4-50+
UV Sterilizer (#650638-R) has been replaced by the
Viqua VH410M
which features:

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Viqua UVMax Model E4-50+<br>UV Sterilizer (#650638-R)

  • Description
  • Specs
  • Parts & Accessories
  • Similar Models
  • Reviews
  • FAQ
  • About UV
  • Install / Manual
  • Warranty

Description, Features & Benefits

UVMax E4-50+ Controller The Viqua UVMax Model E4-50+ has been specially designed for water sources with known clarity and UVT problems. The E4-50+ effectively disinfects water with UVT values as low as 50% for flow rates up to 7 gallons per minute while providing the added peace-of-mind of a real time UV intensity monitor.

Viqua UVMax E4-50+ UV sterilizer is a popular choice for average homes with 1 to 3 bathrooms. It is designed to treat bacteria (such as e.coli and coliform), viruses, and other microbiological contaminants including giardia (beaver fever) and cryptosporidium without the use of chemicals. It is suitable for the treatment of private wells and surface water supplies, as well as municipal water for those seeking a higher level of confidence in the safety of their water supply. The E4-50+ provides a UV dose of no less than 40 mJ/cm2 for flow rates up to 7 gallons per minute (based on a UVT level of 50% and at the end of lamp life).

The E4-50+ features a real time UV intensity monitor which monitors the feed water quality and UV sleeve clarity to ensure that your system is able to safely disinfect your water. If conditions change and the system is no longer able to ensure safe treatment of your water, an alarm will sound. The use of a model with a UV intensity monitor is generally recommended where a known E.coli or other serious problem is present or the feed water parameters may cause problems with UV tramsmittance from time to time (sediment flushing, iron or hard water scale build-up on the UV sleeve etc.). The E4-50+ is able to monitor water with low UVT transmittance that would cause constant alarms on typical systems with UV intensity monitors which are usually calibrated to alarm at higher UVT levels.

The UVMax E4-50+ is manufactured by Viqua, the residential and light commercial division of Trojan Technologies, the world leader in UV water disinfection technology. Viqua has the largest installed base of UV sterilizers in the world spanning some 600,000+ systems. Trojan is ISO9001:2008 registered and has more than 800 employees in 8 countries. Like all Viqua systems, the E4-50+ is manufactured in Canada and uses UV lamps custom-manufactured in the USA.

Key to the long-standing popularity of the UVMax product line is its brand reputation, feature-rich controller, and no-tools maintenance. The high output lamp results in a system with a very compact size relative to its treatment capacity, and its constant current power supply ensures a uniform UV dose even when the source power supply fluctuates. The LCD display ensures all important system information is available at a glance.

UV disinfection is safe, effective, economical, and best of all, does not add undesirable chemicals to your water like chlorine or chloramine.

Wolrd Leading UV Brand
Industry leading brand you can trust...
  • World leader in UV water disinfection
  • Top-selling UV model ever!
  • Made in Canada (Lamps Made in USA)
Color LCD Display
Robust features...
  • UV intensity monitor w/ low UVT capacity
  • Audible/visual lamp failure alarm w/ mute
  • Lamp life countdown display w/ alarm
  • Large color LCD screen
Simple Maintenance
Simple maintenance...
  • Simple annual lamp replacement
  • No tools required!
  • Low cost of operation

Not all UV systems are created equal...A good UV sterilizer is far more than a UV lamp in a tube. You rely on your UV sterilizer to protect the quality and safety of your drinking water and the health of your family. You deserve the best insurance that you can buy for your money. Viqua and its parent company, Trojan Technologies, are literally the world leaders in UV technology. Their systems are backed by decades of bio-assay validation, computer-aided flow dynamics testing, and millions of dollars in lamp and ballast/power supply research and product development. The result is a product that you can have confidence in to work when you need it.

Proper pre-treatment is important to ensure that your UV system performs at its best. See UV Pre-Treatment Requirements for details.

Why UV? - UV Advantages

UV water treatment offers many advantages for the treatment of microbiological contaminants like bacteria (including coliform and e.coli), viruses, molds, algae, yeast, and oocysts like cryptosporidium and giardia. Every year, these contaminants are responsible for thousands of serious illnesses due to the failure of city treatment plants or consumption of untreated well or surface water.

Unlike other disinfection options, UV sterilizers do not add any chemicals to the water, do not produce harmful by-products (THMs and HAs), and do not alter the taste, pH, mineral content, or other properties of the water. Accordingly, in addition to producing safe drinking water, UV disinfection is not harmful to your plumbing and septic system. Furthermore, it is easy and cost-effective to install and maintain without any special training.

UV sterilizers are one of the most popular and respected water treatment technologies in use today. They can be found in a wide range of water treatment applications ranging from simple under sink water filters to huge city water treatment plants.

Safe and effective UV
Safe and effective...
  • Treats bacteria including coliforms and e.coli
  • Treats very wide range of harmful viruses
  • Inactivates cryptosporidium and giardia
Chemical Free Water Disinfection
Chemical-free disinfection...
  • Absolutely no chemicals added
  • No disinfection by-products
  • Doesn't change taste or smell
Easy to Maintain
Easy to maintain...
  • Just clean the sleeve and replace the lamp once per year (or 2)
  • No tools maintenance
  • Low operating cost

With the infrastructure of cities all over North America crumbling under neglect and budget constraints, many customers have asked us if there was a product that they could add to their water system that would provide them with additional insurance and peace-of-mind against the possibility of a failure of their municipal water treatment system. These concerns have arisen due to several high-profile cases of contamination in city water supplies across the continent, some of which have resulted in illness and even death. UV disinfection is a great option to provide this extra level of insurance in your water supply.

Specifications & Operating Conditions - UVMax E4-50+ (#650638-R)

Viqua UVMax Model E4-50+ Features & Specifications
Manufacturer Part Number: #650638-R
Application: average homes, 1 to 3 bathrooms
Maximum Flow Rate (UV Dose > 40mJ/cm2) Recommended!:* 7 GPM (26 LPM)
Maximum Flow Rate (UV Dose > 30mJ/cm2):* 9 GPM (34 LPM)
Real Time UV Intensity Monitor: Has Feature
Large Full Color LCD Screen: Has Feature
Audible/Visual Lamp Failure Alarm: Has Feature
No Tools Maintenance: Has Feature
Constant Current Electronic Power Supply: Has Feature
Lamp Timer Display and Reset: Has Feature
Alarm Mute: Has Feature
Emergency Solenoid Shut-Off Valve Kit: Optional
Flow Restrictor: Optional, 6 GPM to 8 GPM recommended
Water Chamber Material: Stainless Steel (304)
Inlet/Oulet: 1 inch NPT
Electrical: 100-240v, 50/60HZ
Max. Current (AMPS): 0.85
Max. Power (Watts): 83
Lamp Power (Watts): 70
Lamp Length: 25.5" / 65cm
Replacement Lamp Part #: #602806
Replacement Quartz UV Sleeve Part #: #602733
Replacement Lamp/Sleeve Combo Part # (SAVE!): #602810-103
Replacement Controller Part #: #650733R-001
Replacement Intensity Monitor Sensor Part #: #650731-R
Control Module Size: 8.5 x 6" / 22 x 15 cm
Chamber Assembly Size: 30 x 4" /76 x 10cm
Installation: Vertical (Recommended) or Horizontal
Electrical Safety Certification: UL U.S. / Canada
Country of Manufacture: Made in Canada (Lamps Made in U.S.A.)
* For most residential applications, we recommend a UV dose of at least 40 mJ/cm2. Flow rate capacities listed are based on the stated dosage, 50% UV transmittance (UVT), and end of lamp life. If you would like assistance in selecting an appropriate model for your conditions, please feel free to call us toll free at 1-866-376-2690.

Pre-Treatment Requirements

Minimum pre-filtration shall consist of a 5 micron sediment filter. All UV sterilizers require 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 or treated with a salt-free hard water conditioner 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 (mg/l) or manganese levels exceeding 0.05 ppm (mg/l) 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 50% after the above-mentioned pre-treatment, activated carbon or ion exchange filtration may be desirable to improve UV transmittance.

We recommend that you have your water tested for the following parameters before selecting a UV sterilizer. Proper pre-treatment to ensure that your water meets these parameters will maximize the performance of your UV system. It will also reduce your maintenance requirements. If your conditions do not meet these parameters, please call us toll free at 1-866-376-2690 to discuss pre-treatment options or to discuss how the performance of your UV system will be affected.

Not sure about your feed water quality? We do free water testing for all of the parameters necessary to ensure proper operation of your UV sterilizer! Click Here for details!

Feed Water Quality Parameters
UV Transmittance (UVT): Minimum 50%
Hardness: less than 120 ppm (120 mg/l) (7 grains per gallon)
Iron: less than 0.3 ppm (0.3 mg/L)
Manganese: less than 0.05 ppm (0.05 mg/L)
Maximum Water Temperature: 86F (30C)
Maximum Recommended Water Pressure: 90 psi

Replacement Parts and Popular Accessories

10 GPM Sediment Pre-Filter Package - 5 Micron - WH1B+

10 GPM Sediment Pre-Filter Package - 5 Micron - WH1B+

MSRP: US$135.00
Our Price: US$99.95
You save: $35.05

- More Info -

E4-50+ Replacement Lamp/Sleeve Combo Part#:602810-103

E4-50+ Replacement Lamp/Sleeve Combo Part#:602810-103

MSRP: US$245.00
Our Price: US$208.00
You save: $37.00

- More Info -

E4-50+ Replacement Lamp

E4-50+ Replacement Lamp <br>Part#:602806

MSRP: US$199.00
Our Price: US$169.00
You save: $30.00

- More Info -

E4-50+ Replacement Sleeve

E4-50+ Replacement Sleeve <br>Part#:602733

MSRP: US$89.00
Our Price: US$76.00
You save: $13.00

- More Info -

Solenoid Shut-off Valve Kit Part#:650717-002

Solenoid Shut-off Valve Kit Part#:650717-002

MSRP: US$832.00
Our Price: US$707.00
You save: $125.00

- More Info -

Viqua 6 GPM
Flow Restrictor

Viqua 6 GPM <br>Flow Restrictor

MSRP: US$121.00
Our Price: US$56.00
You save: $65.00

- More Info -

Viqua 8 GPM
Flow Restrictor

Viqua 8 GPM <br>Flow Restrictor

MSRP: US$126.00
Our Price: US$107.00
You save: $19.00

- More Info -

UV Intensity Monitor Sensor for E4-50+ (Part#:650731-R)

UV Intensity Monitor Sensor for E4-50+ (Part#:650731-R)

MSRP: US$425.00
Our Price: US$361.00
You save: $64.00

- More Info -

UVMax Model E4-50+ Replacement Ballast/Power Supply

UVMax Model E4-50+ Replacement Ballast/Power Supply

MSRP: US$739.00
Our Price: US$628.00
You save: $111.00

- More Info -

Similar Models

The following UV models are similar to the UVMax E4-50+ in that they are from the same product family or provide similar treatment capacity.

Models with a similar flow rate capacity or are from the same product family
Viqua VH410M
Viqua VH410M
14 GPM - higher UV alarm threshold (requires higher feed water UVT) - very economical

- More Info -
UVMax Pro10
UVMax Pro10
10 GPM - Simply the best! All the bells and whistles! Industry-leading technology, NSF/ANSI Standard 55 Class A Validated

- More Info -

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Viqua UVMax Model E4-50+ UV Sterilizer (#650638-R) Customer Questions & Answers

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How Ultraviolet (UV) Disinfection Works

How the Viqua UVMax E4-50+ UV Sterilizer works

UV sterilizers are an innovative technology that kills bacteria, viruses, and other microbiological water contaminants without the use of chemicals.

A great way to think about a UV sterilizer is to consider the effect of ordinary sunlight when we spend too much time outdoors in the sun - we can get a sunburn and our skin can be damaged. UV water disinfection is a similar process except it is dramatically more powerful then sunlight. A special lamp, surrounded by a quartz glass sleeve inside the stainless steel chamber that the water flows through, produces UV light concentrated at a specific wavelength that is most damaging to microorganisms. Inside the chamber, the contaminants are exposed to the UV light which damages their DNA. Once the DNA of the organism is damaged, the microorganism is unable to regulate its functions and reproduction. It either dies or is no longer able to reproduce and cause illness. We call this inactivation.

Just as the extent of your sunburn can vary depending on how much time you spend in the sun and the intensity of the sunlight on a hot summer day, the amount of UV light the contaminants are exposed to determines the effectiveness of the UV sterilizer. This is known as the UV dose. The 2 factors that contribute to UV dose are the exposure time which is directly related to the flow rate of the water through the UV chamber, and the intensity of the UV light is related to the effectiveness and design of the UV lamp and chamber, the age of the lamp, the clarity of the sleeve, and the clarity of the water being treated. We refer to the clarity of the water as UV transmittance or UVT. It is important to note that sometimes water with a high level of organics can appear virtually clear but have poor UVT since many organics can absorb UV light. We recommend that you have the UVT of your water tested.

UV Dose = UV Intensity x Exposure Time (Flow Rate)

To ensure a high UV intensity, it is important that the UV sleeve be cleaned periodically and that the water is properly pre-treated to remove minerals that can foul the UV sleeve (hardness, iron, and manganese). It is also important to pre-treat to remove sediment as well as organics and tannins that could absorb UV light. Pre-filtration to a minimum level of 5 microns is required by all UV manufacturers.

This model is equipped with a special sensor that continuously monitors the intensity of the UV light in the treatment chamber. If the UV intensity ever drops so low that the UV system is no longer able to safely disinfect your water, the system will produce an audible alarm to notify you. If the system is equipped with an optional emergency solenoid shut-off valve (sold separately), the system will also shut your water off. This is an excellent feature to have on systems that are subject to water quality variations or where additional safety is desired (children, elderly, or immune compromised).

As a UV lamp ages, the intensity of the UV light it produces will decline. UV manufacturers test the performance of their UV systems to ensure that they are capable of safely treating the water based on the UV output of their lamp at the end of its stated life. Beyond this point, the UV lamp might still be illuminated, but the specific wavelength of UV light might not be intense enough to safely disinfect the water. This is why it is very important to replace the UV lamp based on the manufacturer's stated lamp life. Most UV lamps have a service life of 9,000 hours or 1 year.

Many of our competitors advertise the capacity of their UV sterilizers based on a dosage of 30 mJ/cm2. We provide this information for comparative purposes, however, we strongly recommend that you size your UV sterilizer based on a dosage of 40 mJ/cm2. This ensures better disinfection when the UVT is less than optimal and provides extra protection against more resistant viruses. See our UV dose chart for a list of UV dosage levels required to treat common bacteria and other pathogens.

With proper pre-treatment and scheduled lamp replacement, UV disinfection is a highly effective and economical means of disinfecting drinking water. It is the most popular disinfection technology for well water and other private water supplies. It is also growing in popularity as a whole house treatment for homes connected to a city water supply as homeowners seek additional assurance that their water supply is safe, especially in light of recent prominent infrastructure failures in the news across the country.

Learn More

UV dose required to kill common bacteria, viruses, and cysts

Alternative treatment technologies

Recommended Viqua (Trojan) UVMax UV sterilizer accessories

How to remove e.coli from water with UV

Installation, Manuals & Resources

We recommend that UV sterilizers be installed by a licensed plumber; however, your warranty is valid as long as your system is installed in accordance with local plumbing codes and the manufacturer's Owner's Manual. For a homeowner with basic plumbing experience, the installation of a UV sterilizer is relatively simple.

We generally recommend that all UV sterilizers be installed with the treatment chamber in a vertical position, especially those equipped with UV intensity monitors. However, it is acceptable to install the UVMax E4-50+ horizontally if absolutely necessary. You will need access to a nearby standard electrical outlet to power the unit.

Viqua UVMax E4-50+ Owners Manual
UVMax E4-50+ Installation and Owners Manual
Viqua UVMax Lamp/Sleeve Instructions
UVMax Lamp/Sleeve Replacement Instructions

Viqua UVMax E4-50+ Manufacturer's Warranty

All Viqua UV sterilizers are backed by a comprehensive manufacturer's warranty against defects in material and workmanship so you can have the highest confidence in your UV system. In addition to the manufacturer's warranty, when you purchase from HomePlus Water, you have access to some of the country's foremost experts in residential and light commercial UV treatment. We would be pleased to assist you in resolving any technical problem you encounter.

10 Years

Ten-Year Limited Warranty for VIQUA UV Chamber

VIQUA warrants the UV chamber on the VIQUA product to be free from defects in material and workmanship for a period of ten (10) years from the date of purchase. During this time, VIQUA will repair or replace, at its option, any defective VIQUA UV chamber.

3 Years

Three-Year Limited Warranty for Electrical and Hardware Components

VIQUA warrants the electrical (controller) and hardware components to be free from defects in material and workmanship for a period of three (3) years from the date of purchase. During this time, VIQUA will repair or replace, at its option, any defective parts covered by the warranty.

1 Year

One-Year Limited Warranty for Lamps, Sleeves, and UV Sensors

VIQUA warrants lamps, sleeves, and UV sensors to be free from defects in material and workmanship for a period of one (1) year from the date of purchase. During this time, VIQUA will repair or replace, at its option, any defective parts covered by the warranty.

Note: Use only genuine VIQUA replacement lamps and sleeves in your system. Failure to do so may seriously compromise disinfection performance and affect warranty coverage.

General Conditions and Limitations

None of the above warranties cover damage caused by improper use or maintenance, accidents, acts of God or minor scratches or imperfections that do not materially impair the operation of the product. The warranties also do not cover products that are not installed as outlined in the applicable Owner's Manual.

Parts repaired or replaced under these warranties will be covered under warranty up to the end of the warranty period applicable to the original part.

The above warranties do not include the cost of shipping and handling of returned items The limited warranties described above are the only warranties applicable to the VIQUA range of products. These limited warranties outline the exclusive remedy for all claims based on a failure of or defect in any of these products, whether the claim is based on contract, tort (including negligence), strict liability or otherwise. These warranties are in lieu of all other warranties whether written, oral, implied or statutory. Without limitation, no warranty of merchantability or of fitness for a particular purpose shall apply to any of these products.

VIQUA does not assume any liability for personal injury or property damage caused by the use or misuse of any of the above products. VIQUA shall not in any event be liable for special, incidental, indirect or consequential damages. VIQUA's liability shall, in all instances, be limited to repair or replacement of the defective product or part and this liability will terminate upon expiration of the applicable warranty period.

If you are unsure whether an equipment problem or failure is covered by warranty, contact the Viqua Technical Support team at 1-800-265-7246 or e-mail Their technicians will help you troubleshoot the problem and identify a solution. Have ready the model number, system serial number, the date of purchase, the name of the dealer from whom you purchased your VIQUA product, as well as a description of the problem you are experiencing.