How Much Electricity Does an Air Purifier Use in Singapore?

A 45W air purifier uses 0.36 kWh when operated for eight hours at a constant 45W. That costs approximately S$3.37 per 30-day month at Singapore’s October–December 2026 regulated electricity rate. Running it continuously at the same power would cost about S$10.10 per month.

The APEX+ Aero Smart Air Purifier has a supplied power rating of 45W. These figures are calculated estimates, not measured Aero energy-use results. Actual power draw depends on the selected mode and operating conditions.

How much electricity does an air purifier consume?

The answer depends on its wattage and how long you run it. Watts measure the rate of electricity use; kilowatt-hours (kWh) measure the energy consumed over time. A 45W rating is 0.045 kilowatts. If that draw stays constant for one hour, the purifier consumes 0.045 kWh.

Energy used (kWh) = watts ÷ 1,000 × operating hours.
Running cost = energy used × your electricity rate per kWh.

Singapore electricity rate used in this guide

The Energy Market Authority lists the October–December 2026 regulated tariff as 31.16 cents per kWh including GST, equivalent to S$0.3116/kWh. All cost examples below use that rate. Your retailer’s rate may differ; substitute the rate on your own bill. Tariffs change, so these are dated examples rather than a permanent cost promise.

APEX+ Aero electricity cost: 45W example

For eight hours daily: 45 ÷ 1,000 × 8 × 30 × S$0.3116 = S$3.36528, rounded to S$3.37. The table assumes a constant 45W draw and excludes filter replacement costs.

Does an air purifier use a lot of electricity?

Compare actual wattage rather than assuming every air purifier has the same running cost. The examples below illustrate different constant power draws; they are not specifications for particular products or claims about the market average.

Also compare cleaning capacity. A lower-wattage model is not automatically the better choice for a larger room. Aero’s published particle CADR is 300 m³/h; room fit and electricity use should be considered together. See our CADR and room-size guide.

Sleep Mode, automatic mode and actual consumption

Aero includes Sleep Mode, smart sensors and Wi-Fi app control. The supplied specifications do not provide separate wattages for each fan speed, Sleep Mode or standby. We therefore do not assign a lower electricity cost to those modes. To find actual use, measure your usual routine with a compatible plug-in energy meter and multiply its recorded kWh by your tariff.

How to manage air purifier running costs

• Use the timer to match operating hours to your routine.
• Choose a model with suitable cleaning capacity for the room you intend to treat.
• Keep the intake and outlet unobstructed and maintain filters according to the instructions.
• Compare electricity costs and replacement-filter costs separately when budgeting.

Frequently asked questions

How much does it cost to run an air purifier overnight?

At a constant 45W, an eight-hour night uses 0.36 kWh and costs approximately S$0.11 at the tariff used here. Thirty such nights cost about S$3.37.

How much does a 45W air purifier cost to run 24/7?

At a constant 45W for 30 days, it consumes 32.4 kWh and costs approximately S$10.10 at S$0.3116/kWh.

Is 45W the electricity consumed every hour?

45W is a power rating, not an energy total. One hour at a constant 45W consumes 0.045 kWh. Actual operating draw may differ from the rating.

Does this include replacement filters?

No. Electricity and consumable filters are separate ownership costs. Contact ULTI for current compatible-filter availability and pricing.

Explore the APEX+ Aero

View the APEX+ Aero Smart Air Purifier for H13 HEPA filtration, activated carbon, smart controls and a 2-year ULTI warranty. For a broader comparison, read our Singapore air purifier buying guide.

Calculations checked on 13 October 2026. Costs use the October–December 2026 regulated tariff including GST and are rounded to the nearest cent.