My ResMed 7 says 100v at 2.2a. (Recall the basic elect. formula W = A x V) That would be 100 volts x 2.2 amperes = 220 watts, or about the same as three 75 watt light bulbs. It uses residual power (light, etc.) when not in use. My GoodKnight is rated at 20 watts, or about the same as a low wattage fluorescent. It also uses some residual power when not in use (e.g. keeping time etc.) You can reduce your electricity use by unplugging when not in use.

You should be able to find the amperage or wattage rating either on the back/underside of your machine or in your user's manual.

If you use your machine 8 hours a night then multiply the 220 watts by 8 to get your watt-hours. Your utility company charges by kilowatt hours. 220 watts at 8 hours is 1.76 kWh. Let's say your power company charges 10 cent a kilowatt hour. Gee, that sounds like a bargain to me at less than 20 cents a night or about $5 a month. If I used my GoodKnight instead of my ResMed, I would be paying a tenth of that!

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Additional Comments: ResMed S7; Goodknight machine for travel |