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Posted by HeatPro on January 07, 2005 at 09:45:45:
In Reply to: Re: Can a tankless coil heat baseboards? posted by HeatPro on January 07, 2005 at 09:39:36:
A consideration is that water pressure is 40 psig in many homes, so the city water pressure can drive the water thorugh and still have 25 psig water pressure left. The pressure drop can be severe at 5 gpm through a tube bundle, so the pump must pump INTO the coil with the expansion tank on the inlet of the pump to assure drive through the bundle and the pump might have to be high-head to get the required flow. Two pumps in a loop-subloop might be required; one to drive the water through the tankless coil at 2.5 gpm, and another to give even heat from beginning to end of the baseboard loop at 10 gpm.