Easy to replace
"We were able to replace the UV lamp ourselves, with US Water's guidance, saving on labor costs. Also set auto reorder schedule to stay on maintenance plan."



US Water 20 GPM Replacement Ultraviolet Lamp
Order by 12 PM EST and this system will be on its way the very next day.
Free standard shipping on most products over $199.
Free shipping on most orders over $199 in the continental USA. $299 minimum for extended delivery states: AK, AL, AZ, CA, HI, ID, MD, ME, MN, MS, MT, NH, NV, OR, UT, VA, VT, WA, WV. Freight orders excluded. Speak to a water expert for more details.
Our Master Water Specialists and Certified Water Specialists review your water analysis and address your specific water problems. WE then design a system that we'll guarantee will solve your water problem(s) and back it with our One-Year Money Back Promise (Guarantee).
It all starts with a Laboratory Test of your water. Then, our Master Water Specialists and Certified Water Specialists will review the results of your water analysis and scientifically discuss the best way to treat your water, provide on estimate of how to do that, and then we provide you a One-Year Guarantee of Satisfaction. It's our Promise to You that our system will do what we say or we will give you your money back*


Genuine Factory Replacement Bulb
Fits system ballast pictured to the right
Overall rating: 4.616667 / 5 from 60 reviews.
The US Water Replacement Ultraviolet Lamp 20 GPM is praised for its easy replacement process and the clean, safe water it provides. Customers appreciate the genuine factory replacement bulb and its compatibility with specific UV systems.
Review topics: [quality, replacement, light, system, experience, customer service, service, water, lamp, shipping, works].
"We were able to replace the UV lamp ourselves, with US Water's guidance, saving on labor costs. Also set auto reorder schedule to stay on maintenance plan."
— Joe B. (5/5)
"This Ultraviolet Lamp works fine I believe but if your not using your water system for 6 months it has a counter by days that you cannot reset thus causing an alarm that goes off signaling that it is time to replace it once a year. So, I have to purchase two of these in one year to stop the alarm."
— Steven S. (3/5)
"Love the whole system. I also wanted to show how dirty my filter was after one year. . . notice the comparison to a clean one."
— Scott D. (5/5)
"Great product. Easy to replace. Comes with new 365 day key fob for controller"
— Tim S. (5/5)
"When the UV light reaches 9000 hours the bulbs controller tells you that it needs replaced. The part came quickly and installation was simple with few tools depending on your installation."
— Mike S. (5/5)
"Love my us water systems setup. Bought a uv light several months in advance and never opened the box until it was time to install. Upon opening the box the light was broken which happened during shipping. At first us water system didn’t want to replace it but after several calls and explaining what happened they eventually replaced it and retained one happy customer. Thanks US Water Systems"
— Duane B. (5/5)
"The light works as expected. We have clear, quality water. Easy to replace on a yearly basis."
— Jeff M. (5/5)
"Came in a well-packed box and was easy to install. It has a good reminder system."
— Kishore G. (5/5)
"I didn't realize the light needed to be replaced at the year mark. The alarm alerted me to expiration of the original bulb. I have hit the 1 year mark since installing the Defender unit. It was easy to install and works great. Replacing the bulb was quick an simple. They entire process took less than 5 minutes. The support team at US Water System is always there to help."
— John S. (5/5)
"Very happy with our RO system. I feel much better and safer about the water we are using in our home. The UV light is one of the things we really like about this unit. It is high quality and very easy to replace. Last about a year."
— Jody O. (5/5)
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