UltraAqua ULTRATHERM™ UV Steriliser Lamps
Replacement ULTRATHERM™ UV steriliser lamps for UltraAqua MR-series and open channel systems. Lamps are rated to 16,000 hours, roughly two years of continuous operation, and are listed to suit 75W, 220W, 350W and 440W systems.
UV steriliser lamp life and driver matching
Amalgam construction is what gives these lamps their output density and their tolerance of cold water. Vapour pressure is buffered by the solid alloy rather than tracking wall temperature, so a system treating winter intake water holds dose where a conventional low-pressure lamp would not. That behaviour depends on the driver as much as the lamp. ULTRATHERM™ drivers regulate lamp current to keep the amalgam at its operating temperature, which is why a generic ballast is not a substitute. It will strike the lamp, but rated output, rated life and any confidence in reactor dose go with it. Replacement drivers are listed on the UltraAqua UV Sensors & Lamp Drivers page.
Output declines gradually and without visible sign. Emissive coating is lost from the electrodes at each strike, so heavily cycled systems age faster than those left running, and the quartz envelope solarises with exposure. The 16,000 hour rating is the point at which remaining output can still be relied upon, not the point of failure. Where a UV sensor is fitted, a slow decline that survives a sleeve clean is the signal to change lamps. Without one, run to hours.
Older units — check the pins
At 220W and 350W the lamp changed with the unit generation, and the pin shape is the quick way to tell them apart. Current HOXL G3 lamps have diamond pins and suit units with a UV ID starting with 8. Earlier units, UV ID 7 or lower, take a square pin lamp. The two are not interchangeable, so check the base of the lamp you are pulling out, or the UV ID on the control cabinet, before ordering.
Both are held in stock. The square-pin versions are listed below the current models. The 440W lamp is unaffected and has only ever been supplied in one version.
Handling and disposal
Handle lamps with gloves. Skin oil on the quartz creates hot spots that etch the envelope and take life off the lamp. Allow lamps to cool before removal, and do not view an operating lamp outside its housing, as UV-C causes corneal and skin injury with no sensation of heat to warn you.
Replace the quartz sleeve O-rings while the unit is open. Used lamps contain mercury and must go to a licensed lamp recycler rather than general waste. If you are unsure which UV steriliser lamp your system takes, send us the serial number from the control cabinet and we will confirm it before you order.
Related spares:
We can also source and supply other spare parts not listed here. To find the part you are looking for, please contact us at Fresh By Design.
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