In article >, dsi1 >
wrote:


> at the same temperature. Boiling water and cooling it is supposed to
> provide clear icecubes when frozen because the dissolved gases have been
> removed. My guess is that setting water in a container under a strong
> vacuum might be the better way to go if you want to de-gas water.

Boiling water before making ice seems like a bad idea for people at
home, and most of us don't have a good source of vacuum. In addition,
home fridges and freezers do poorly at making large quantities of ice.

Companies that make ice are all designed for this. The machines that
produce cold also produce a lot of waste heat. That heat is used to
boil the water.

> Whenever I have to boil water, I always start with the hottest tap water
> I have. When filling ice cube trays, I'll always use cold tap water. To
> do otherwise would be a waste of energy.

Most people have to pay to heat that tap water. You have to heat not
only the water that you actually use, but also all the water you let run
down the drain while it was coming up to temperature. Afterwards, you
are left with pipes full of hot water, all of which you paid to heat.

--
Dan Abel
Petaluma, California USA