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Posted by Heatpro on January 19, 2006 at 21:26:04:
In Reply to: Re: Heatmanager vs Honeywell T475A posted by Dave on January 19, 2006 at 15:43:32:
It is hard to say because the system determines efficiency. I don't know where the ductwork is to the 2 fan coils. When you control the water temperature with the T475A, there is a probability that the fans will have to run longer to move the air through the ducts. If the ducts are in crawl or attic spaces, then the usual poor insulation on the ducts loses heat to the unoccupied cold spaces it runs through. So although the boiler would run less cycles at lower temperature, there could be more losses from ductwork due to longer fan on cycles and fan power being used longer getting heat to the rooms at lower coil temperatures.
I think the HeatManager would enable the higher temperatures when needed and give a more responsive system to such varied heat needs as domestic water, fan coils and radiant floors in one system.
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