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Posted by Heatpro on July 10, 2006 at 15:46:39:
In Reply to: Aquabooster versus water heater posted by Gerry on July 10, 2006 at 15:29:48:
Aquaboosters, if meant to describe a boiler-fired indirect water heater, are more efficient in that they don't have a flue to lose heat from while they sit all day staying hot as a water heater does. Usually, an indirect heater is better insulated as well; they also make more hot water quicker.
However, there are also well-insulated, high-efficiency 94% AFUE direct vent (no open chimney flue) condensing water heaters with excellent insulation.
http://oee.nrcan.gc.ca/publications/infosource/pub/home/Heating_With_Gas_Section9.cfm
http://www.aceee.org/pubs/a042_w1.pdf
http://www.modbs.co.uk/news/fullstory.php/aid/1337/High-efficiency_condensing_water_heaters_%97_paradox_or_paradigm_.html