On Sun, 19 Sep 2010 14:46:05 -0400, Sam Takoy
wrote:

On 9/19/2010 1:32 PM, Molly Brown wrote:
On Sep 19, 10:24 am, Sam wrote:
Hi,

Yesterday, for the first time I saw what was inside a baseboard
radiation: 3/4" copper tube with fins. I see how the fins can be
efficient at releasing the heat. But the volume of water is minuscule.
Over an 8' run, the amount of water in the tubing is

pi*(3/8)^2*8*12*0.0173160173 = 0.734398282 quarts

But how much heat can be contained in less than a quart of water?

Many thank in advance!

Sam

How many GPM are you re-circulating?

I don't know. I've always assumed (incorrectly?) that the pump stays on
just long enough to replace cold water in the system with hot water. So
I figured in one cycle, the water in the fin tubing get replaced just once.
The pump runs CONSTANTLY