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How Often Should You Replace the UV Lamp in a Water Sterilizer, and How Do You Do It?
- Replace about every 12 months
- Glowing ≠ working
- Clean the quartz sleeve
- Switch off before opening
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Why a Glowing Lamp May Not Be Working
UV sterilizers kill bacteria and viruses with invisible UV-C light. The lamp also gives off some visible blue light, which keeps shining long after the UV-C output has dropped too low to disinfect. That is why replacement is done by time, not by whether the lamp is on.
Replacement Schedule
| Part | Typical interval |
|---|---|
| UV lamp | About every 12 months / ~9,000 hours (follow the maker) |
| Quartz sleeve cleaning | Every 3–6 months, more often with hard or iron-rich water |
| Quartz sleeve | When scratched, cracked or permanently cloudy |
| O-rings | When the sleeve is changed or if leaking |
| Pre-filters (sediment, carbon) | As scheduled; dirty water shields germs from UV |
Signs the Lamp or Sleeve Needs Attention
- The lamp is about a year old.
- The lamp-out alarm or indicator shows a fault.
- A lab test finds bacteria after the UV.
- The quartz sleeve looks cloudy, brown or scaled.
How to Replace a UV Lamp Safely
- Switch off and unplug the ballast; never look at a lit UV lamp.
- Let the lamp cool for a few minutes.
- Remove the lamp connector and pull the lamp straight out of the sleeve, holding it by the ends.
- Fit the new lamp without touching the glass with bare fingers (use gloves or a clean cloth).
- Reconnect, power on and check the indicator.
- Every few months: close the water, release pressure, remove and clean the quartz sleeve with a mild descaler, rinse and refit with good O-rings.
Replacement Lamps and UV Units
H-TECH UV and ozone replacement range: lamp options
| Model / size | Price |
|---|---|
| 1 lamp 16w | KSh 11,600 |
| 1 lamp 25w | KSh 13,000 |
| 1 lamp 40w | KSh 26,500 |
| 2 lamp 40w | KSh 31,900 |
| 1 lamp 55w | KSh 40,000 |
| 2 lamp 75w | KSh 63,800 |
Current listed prices incl. VAT (updated 13 October 2026). Order: H-TECH UV and Ozone Replacement Range.
H-Tech 0.4GPM 6W UV SterilizerKSh 5,000
H-Tech 0.65GPM 10W UV SterilizerKSh 5,300
H-Tech 1GPM 12W UV SterilizerKSh 6,000
H-Tech 2GPM 16W UV SterilizerKSh 11,600
H-Tech 6GPM 25W UV SterilizerKSh 13,000
H-Tech 12GPM 55W UV SterilizerKSh 40,000
UV Steriliser 12w, 1/4″ InletKSh 10,000| Product | Price |
|---|---|
| H-Tech 0.4GPM 6W UV Sterilizer | KSh 5,000 |
| H-Tech 0.65GPM 10W UV Sterilizer | KSh 5,300 |
| H-Tech 1GPM 12W UV Sterilizer | KSh 6,000 |
| H-Tech 2GPM 16W UV Sterilizer | KSh 11,600 |
| H-Tech 6GPM 25W UV Sterilizer | KSh 13,000 |
| H-Tech 12GPM 55W UV Sterilizer | KSh 40,000 |
| UV Steriliser 12w, 1/4″ Inlet | KSh 10,000 |
Current listed prices incl. VAT (updated 13 October 2026).
Sizing a new unit? Use the UV sterilizer size calculator and see UV sterilizer price and sizing.
UV Works Best on Clean Water
Sediment and colour cast shadows that protect germs. Fit UV after sediment and carbon filters (and after RO in a vending plant). Hard water scales the sleeve, so a softener helps. See UV vs ozone.
Watch: RO purifiers and water ATMs
Frequently asked questions
How often should I replace my UV water sterilizer lamp?
About every 12 months of continuous use, or as the manufacturer states.
Does a UV lamp still work if it is glowing?
Not necessarily; UV-C output fades while visible light continues.
How often should I clean the quartz sleeve?
Every 3–6 months, more often with hard or iron-rich water.
Can I touch a UV lamp?
Avoid touching the glass with bare hands; skin oils create hot spots. Never look at a lit lamp.
Should UV come before or after filters?
After sediment and carbon filtration (and after RO), on clear water.