I saw this post over at the K-cup Exchange and thought it was really interesting re: the cost per cup in terms of electricity and the issue of whether or not to leave your Keurig on all day long.
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I have a device that was designed to measure electricity usage in real time and demonstrate the many ways our appliances waste energy. I used it to find the answers to the following questions.
1: How much power does a Keurig consume if left on all day?
2: How much does it cost to brew a cup of coffee with a Keurig?
And for comparison...
3: How much does it cost to brew a cup of coffee with a Mister Coffee?
Using my Keurig Model B60 and 12 cup Mister Coffee I made the measurements and here are the results.
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1: How much power does a Keurig consume if left on all day?
Starting from a warm machine I left the B60 on for a 12 hour period. My meter displayed that it would cost only 1/3 cent per hour or approx 8 cents per 24 hour day to just leave the Keurig on.
The Details: The B60 uses 17 watts/.14 amps of electricity when left on but not brewing. Probably for the display. Every minute or so the heater comes on and current spikes to 420 watts for a few seconds as it maintains the internal reservoir water temperature.
2: How much does it cost to brew a cup of coffee with a Keurig?
I then did a second test making 4 large cups of coffee ( 9.75 oz) starting from a cold machine and turning it off after 1 hour. The total cost for running a B60 for 1 hour and brewing 4 cups during that hour was almost 2 cents or approx 1/2 cent per cup.
The Details: Upon startup the B60 draws 1290 watts/10.75 amps for about a minute. While brewing a cup it varies from a low of 420 watts to a high of 1290 watts as it takes water from the external reservoir and heats it or holds it for the next cup. Between cups it draws 17 watts at noted before.
A Surprise........My Keurig B60 turned off but left plugged in still draws 9 watts continuously which would cost about 38 cents per month.
3: How much does it cost to brew a cup of coffee with a Mister Coffee?
I brewed a 12 cup (60 oz.) pot of coffee and kept it warm for 4 hours. The brewing cycle plus the first hour costs 3 cents and about a 1 cent per hour to keep a pot warm.
I remembered that the Keurig systems let you set your water temp, but not my MrC. So I measured the water temp of a fresh made pot and it was only 172 degrees. Hummmm?!
The Details: From startup till first pot brewed the MrC draws 900 watts/7.6 amps. Afterward every few minutes while warming the pot it cycles from 8 to 900 watts and .06 amps to 7.6 amps.
Further testing revealed it still uses 8 watts/.06 amps when turned off. So like the Keurig it costs about 1 cent per day if you leave it plugged in.
***These numbers are taken from a Model4460 KillAWatt Power Meter. Some of these readings were pretty low and one could get better results with longer test periods. The dollar amounts are based upon my electricity costs of 13.4 cents per kilowatt hour which are high for VA and US averages. Look on your bill to find your cost. Some bills show electricity rates as 2 numbers, if yours does, you must add the costs of both electric production and electric distribution together to determine the real total. Heres a link to the average state costs for electricity...
http://www.eia.doe.gov/cneaf/electricit ... 5_6_a.html
Happy Brewing
Al (user name = Margo & Al)