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Posted by HeatPro on September 17, 2009 at 12:08:30:
In Reply to: Tankless vs. Indirect Domestic Water Heater posted by Mark on September 17, 2009 at 11:44:38:
You will then have two units to service, both with burners capable of heating the house. Most areas replace indirect water heaters in five years due to liming of the exchanger and controls. They are serviced yearly in Europe and replaced here as most are used to not servicing a tank water heater than lasts a decade or more.
Try this idea:
http://www.heatpro.us/designtree/documents/tanklesssys.htm
There are many installations working now with a $1000 heater and a tank that costs less than a separate boiler and seperate water heater.