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Void
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9:42 am - October 26th, 2009
Gravity.
Since you are not going to be able to heat the water to a boil, use a funnel and a stopcock valve on the top.
You probably won’t get a true reading unless you have enough water to completely fill the system, so you’ll also need a stopcock on the bottom.
Measure your change in temperature of the H20 over, say, 5 minutes. (Fill system, wait 5 minutes, drain system and measure temp in outlet flow.)
And, if possible, use copper – better heat absorption.