Ok Ive been checking into these now and would like to have hot water
for washing hands only. I have a few questions on them though.

Ive been looking at the PowerStream Ae12
(http://www.tanklesswaterheatersdirec...treamIndex.htm)
for under the sink,
The ariston 4
gl(http://www.tanklesswaterheatersdirec...istonIndex.htm)
for under the sink and a
GE 2.5 gallon water
heater(http://www.homedepot.com/prel80/HDUS...20308985-22733)
for under the sink.
I understand the Ariston 4gl would have to be plugged into the wall
full time so it can heat and keep the stored 4gl water hot. It has a
1500 element which sounds like its going to be pricey in my electric
bill if left on all the time and if plugged in when only needed it'll
take alot longer to heat the water and end up using a lot of
electricity.

The powerstream ae12 appears to be the cheapest at $169.00 and sounds a
bit pricey for hook up with 8 gauge wire and 2 breakers but for a one
time cost of installation and the way I understood it to operate would
be the better choice as the hot water is only heated when you turn on
the water. When the water isnt on there is no electricity being used.
Please correct me if I read it wrong. Also at 240v's how would I
determine a size breaker I would need? Any formulas for this?

I just heard about the Ge 2.5 gl water heater but the guy at home depot
said its better than the tankless.It'll use less electricity. To me it
sounds similar to the ariston 4 gl as the ge has 1440 watts and plugs
in as well.Not to mention it holds less water in the tank. So to my
knowledge it would cost roughly the same in electricity use to keep the
water warm just as the ariston.

It sounded to me that the smaller powerstream under the sink type
tankless water heaters were more cost efficient in usage as it only
uses electricity to warm the water when the hot water is in use. Is the
powerstream ae12 giving you 12 gallons per hour?
The units are priced near the $180 mark and under except for the
aristone that was $129.
Anyone know any different? Am I reading between the lines correctly?