On Feb 8, 2005, at 11:02 PM, Ted Mittelstaedt wrote:
The Bosch AquaStar line is rated at a maximum efficiency of .66 - .78 energy factor, here is the link:
http://www.controlledenergy.com/html/aquastar/design_features.html
The tanked units on this page range from .62 to .65 energy factor
http://www.aceee.org/consumerguide/topwater.htm
This is not a particularly large difference. The .05 or so difference of the tanked models is simply due to the fact that since they have hot water tanks, those tanks lose heat, whereas a point-of-use model has no heat loss except when it's in operation.
But this has to be offset by the increased cost of manufacturing several
of these devices instead of just 1 heater, the increased maintainence
costs because now you have many things that can break down instead of
just one, and you have to run gas piping all over the place, and you
have to put in an exhaust vent for each unit.
You are obviously behind the times, Ted. Here is one that is tankless and only requires one per house (or one per tanked unit replaced). I just found this from googling and have no personal experience with it. It is electric.
<http://www.gotankless.com/faq_1.html>
Where the savings comes in is that they are typically used in locations where there are very low infrequent usage of water. And in those situations they save a huge amount of money. But in the typical 2 parent, 2.5 child single family home the point-of-use models save very little.
wrong. see above
To compare this to 20 year old technology is foolish.
Not every industry has technological advances at the rate of the computer industry. Consider that you could take a 100-year-old telephone set and plug it into the telephone network today, and it would still work.
We are not talking about phones.
Chad
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