Independently Tested Hand Dryer Energy Consumption
The most important aspect of energy efficiency with a hand dryer is not only the rated power, but also the effective dry speed time. As we previously pointed out in the Dry Speed comparison tests, these results are mean’t as a comparative guide as opposed to demonstrating the likely energy consumption of a hand dryer when in use. The reason being is that the Dry tests we have conducted provide perfect conditions to compare one hand dryer’s performance against another but they are more stringent than a normal hand washing/rinsing scenario.
The dry test was conducted at Intertek in a independent lab and involved imersing one identical pair of hands for 5 seconds in a temperature controlled tank and drip drying without shaking for 5 seconds before inserting the hands under or in the hand dryer for 15 seconds and measuring the mositure reduction using a pre-weighed paper towel.
The Energy consumption was measured using pre-calibrated measuring equipment, including a voltage control device to precisely stabalise the electrical supply.
The Dry Test Results (in 15 secs) combined with rated power
The D-flow blade hand dryer 95.2% average mositure reduction. The D-flow has an adjustable motor so dry speed and efficiency was tested on ECO and TURBO mode. Eco mode rated power measured 0.468kw and Turbo mode measured at 1.103. D-Flow on Turbo mode used 4.59 watts, on Eco it required 20 seconds to achieve 95% moisture reduction and therefore consumed 2.6 watts
The Mitsubishi Jet Towel 94% average moisture reduction. The Jet towel also has an adjustable motor and optional heater element. Based on the information available the Jet Towel on Turbo would achieve a 95% mositure reduction in 16 seconds and tested at a rated power of 1.24kw therefore consuming 5.52 watts per dry and on ECO mode the rated power was measured at 0.541kw and produced a approx 18 second dry time. Therefore consuming just 2.7 watts per dry. There was so little difference in the performance of the Mitsubishi Jet Towel between Turbo and ECO mode that it seems sensible to purchase the unheated, lower cost version.
Xlerator NEW 0.5kw version achieved a 85.6% moisture reduction and measured at just 0.498kw. Test information is not complete as with the Turboforce so this only tells us that the Xlerator used 2.08 watts in 15 seconds but Dry hands were not yet achieved. We can approximate that Dry hands (95% mositure reduction) would be achieved at around 20 seconds therefore it remains very energy efficient at 2.78 watts per dry
The Dyson airblade produced 96.3% average moisture reduction. Rated power measured at 1.608kw. Airblade used approx 6.25 to 6.4 watts per dry (to achieve 95% moisture reduction defined as DRY)
TurboForce MARK II achieved a 92% average moisture reduction and achieved a complete dry in approx 17 seconds. The TurboForce has an adjustable motor but was only tested this at a rated power of 1.522kw. It can be reduced to no heat at 0.7kw and down further still to a ECO 0.35kw mode, so the Turboforce requires further testing to know its optimum energy efficiency setting. Energy consumption to achieve a 95% mositure reduction was 7.18kw. Expected energy on 0.7kw would be 3.8 watts per dry and a further reduction on ECO mode.
G-Force TURBO 85.2% moisture reduction was achieved at a power output of 1.120kw and a 95% moisture reduction took 20 seconds therefore energy consumption was 6.22 watts. The ECO model of the G-Force still requires testing
Airforce 83.2% moisture reduction achieved and the Airforce took a somewhere between 23-25 seconds to achieve 95% mositure reduction. The power rating was measured 1.136kw therefore consumption per dry was between 7.25 and 7.88 watts per dry
C-Force 80% reduction and measured at 0.89kw on warm air setting. ECO setting not available and test results not obtained beyond 15 seconds
Vortex 71% mositure reduction with a rated power measured at 0.475kw. The product was not tested beyond 15 seconds so we have no accurate assessment of consumption per dry. It is fair to say though that based on other hand dryers performance the Vortex would not achieve 95% moisture reduction in less than 25 seconds. Assuming this we would estimate a energy consumption of somewhere around 3.25 to 3.75 watts per dry, so still energy efficient despite weak drying performance (over 15 seconds it was weaker than UltraDry Pro 1)
The UltraDry Pro 1 – Achieved 75% mositure reduction in 15 seconds and despite being one of the best performing conventional hand dryers had not achieved 95% mositure reduction after 30 seconds. We estimate at 33 seconds the UltraDry pro 1 would achieve this, therefore approximate energy consumption based on the rated power measured at 2.225kw would be 20.5 watts per dry. As this is one of the very best conventional hand dryers will a higher RPM motor it shows how much more energy many warm air hand dryers would use than the new breed of high speed hand dryer.