"Great melting service cables, Batman!"
I thought the 9.5kW units we have over here pulled a lot of current. They've become more common in recent years, often fitted to supply hot water in a location remote from the main tank, for example: Triton 9.5kW Water heater
One thing you need to remember with these units is that the output temperature is inversely related to the flow rate. In the U.K. one above, for example, to get water out at 140 degrees you'd be looking at only about 3/4 gal. per minute flow rate based on our average water supply temperature.
According to the specs on that 22kW American unit linked to above, you could get only just over 1-1/2 gals. per minute for 140 degrees out with water going in at 50 deg.
[This message has been edited by pauluk (edited 09-03-2005).]