Originally Posted by kalutika
Water expands when it freezes. If you melt one cubic foot of ice you will not have one cubic foot of water. Basically there is no way for the water level to rise from melting ice.
The only things that will greatly affect the volume of smoke is the heat management or the quality of the seals. Personally i have experienced denser clouds with ice in the base.
Water level can rise from melting ice if the ice is piled up above the water line. ^_^ But yeah, water expands upon freezing, not vise versa. It is one of the few things that exhibit this feature.
Also, back to the original post, cooler water generally does give the appearance of bigger clouds because the smoke is moving slower (elementary physics here folks).