"Our research showed that a successful product would produce 12 liters (13 US quarts) of potable water in a 24 hour cycle - enough to support the needs of a large family"
每天可以產生12升飲水
http://www.elementfour.com/products

"The WaterMill is designed to minimize energy use. It's so efficient that producing one liter of water costs only three to four cents."
每產生一升水約花費3~4美分電費,約台幣1元
http://www.elementfour.com/products/the-watermill

由台電網頁得知,大約一升水要用掉1/3.3239=0.3度,說實在也不算貴
http://www.taipower.com.tw/left_bar...l_bill_idea.htm