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Daniel - thanks for the further explanation - with the use a 160F operating temperature as a constant that means the ambient air temperature could be 60F to 140F? Not sure that makes sense. Are we sure the values at the top are not fluid temperature? ...

The Delta T row in the above table (very top row) is the difference between water temp (ti) and the ambient air (to). So we are just providing that variable for the user. That way, we don't have to assume what the ambient temp is, or what the water temp ...

That makes sense! And agree. So how do the Uponor charts account for that difference? Looks like they assume a constant heat transfer rate for that equation - the delta T is for fluid temperature drop. What am I misunderstanding? ------------------------------ ...