How to Replace a UV Lamp

How do I know when it’s time for a UV bulb replacement?

Ultraviolet water purification maintenanceMost UV lamps are designed to run continuously for about 9,000 hours or 12 months before losing their effectiveness. 

Unlike regular light bulbs, UV lamps do not burn out – they solarize. This means that they gradually lose their light wave intensity to about 60% of what a new UV bulb provides.

Thus, even if the lamp hasn’t burnt out at 9K hours or 12 months, the ultraviolet bulb should still be replaced as a precaution. 

Some UV systems have a "ballast" or controller that will indicate it is time to change out the lamp. The indicator may be a green light on the controller or a countdown from 365 until replacement due date. 

If your system doesn't have a lamp countdown, we suggest setting a calendar alarm for yourself. And as a courtesy, we send our ESP Water Product customers emails reminding them when the UV lamp is due for replacement.

Instructions for Replacing a UV Lamp:

Before you change a UV light bulb, it's best to refer to the owner's manual for your specific UV system. There are many different UV filtration system manufacturers, and the  instructions we provide are meant to be only a general guideline. 

If you have your new replacement lamp, o-rings, and latex gloves (optional), then let's get started:

  1. Close all faucets and turn off the water supply.
  2. Press the pressure button to release the pressure from the cartridges.
  3. Unplug the power. There may be an alarm that goes off as a warning.
  4. Check to make sure the UV system is not too warm. You may want to allow the system to cool down for 10 minutes.
  5. Carefully remove the protective cover or safety cap (at the top of the UV system) by squeezing the tabs, but make sure the lamp plug wires remain connected.
  6. Remove the lamp plug, but make sure the strain relief wires remain connected.
  7. You may consider putting on latex gloves before removing the lamp or sleeve as the oils on skin can damage the UV lamp and sleeve. Diagram of UV Lamp and Sleeve
  8. Remove the lamp/sleeve assembly along with the sleeve bolt from the chamber.
  9. Unscrew the UV lamp by holding the sleeve bolt.
  10. Unscrew the sleeve bolt and remove o-rings from the quartz sleeve.
  11. Clean or replace the quartz sleeve. To clean, use a cloth soaked in CLR, vinegar or some other mild acid. Rinse with water.
  12. Insert new o-rings and tighten the sleeve bolt to the quartz sleeve.
  13. Install and secure the new lamp into sleeve being careful not to over tighten which can break the sleeve.
  14. Insert and secure the lamp/sleeve assembly.
  15. Carefully align connections by rotating the ring clamp and installing the lamp plug.
  16. Insert the safety cap and plug the system in again.
  17. Open the faucets and turn on the water supply.
  18. Check for leaks.
  19. Perform the disinfection procedure per your owner’s manual.

If you own a VIQUA Ultraviolet Disinfection System, the following information will provide additional help.

Viqua Lamp Sleeve replacement instructions


Video courtesy of Viqua

Replacement lamps and sleeves for Viqua, Pura and more