Electricity is usually modest: VIQUA Arros 9/15/22 are rated around 33W, 46W and 60W. The larger recurring expense is the scheduled lamp-unit replacement plus any prefilters.
Electricity cost
At continuous operation, 33W uses about 289 kWh/year, 46W about 403 kWh/year and 60W about 526 kWh/year. Multiply by the local electricity rate for the annual power cost.
Lamp replacement
Residential UV systems generally use a scheduled lamp or lamp-unit replacement interval because UV output declines with operating time even if the lamp still visibly glows.
Quartz sleeve cleaning
The sleeve is reusable until damaged or permanently fouled, but it should be inspected and cleaned during maintenance because scale or staining reduces UV transmission.
Prefilter cost
If the UV system depends on sediment or carbon prefiltration, those cartridge replacements belong in the UV ownership budget too.
How to size and install UV Water System Maintenance Cost per Year
Equipment performance depends on matching capacity to the load rather than choosing the largest model. For pumps and heaters, that means required flow, pressure or temperature rise. For dehumidifiers and pool equipment, it means the environmental or hydraulic load. For UV treatment, it means validated flow at the required dose with appropriate upstream water quality.
Check electrical service, drainage, plumbing connections, clearance and ambient operating limits before purchase. A system can look ideal on a specification table but become expensive when the installation requires a new circuit, condensate pump, larger plumbing, structural changes or professional labor that was not included in the hardware price.
Operating cost, maintenance and failure points
Compare energy use and consumables over several years. Pumps, heaters, dehumidifiers and UV systems add electricity cost; pool and spa equipment may add filter or chemical maintenance; leak-detection devices may require batteries, valves or hub hardware. A lower purchase price can lose its advantage when operating cost or replacement parts are materially higher.
Look for serviceable components, warranty terms, replacement-part availability and the maintenance tasks the owner will actually perform. Equipment that depends on inaccessible proprietary parts or frequent neglected maintenance carries more long-term risk than a slightly more expensive system with clear service support.