I use cold.
the type of material you can use to make the temperature of water is to, use boiling water or cold water and if you mix them together you can get warm water, and if you use hot water you'll have hot steamy water and for cold water you'll have an ice cold water.
Cold
Some toys use cold and others use hot but what i would do is look and see what it uses. But i usually use warm water.
true, the water is going to get hot either if you use cold or hot water You did not answer my question of if it was "true" or a "myth" that the water had to be from the cold water faucet. From what you did respond to it sounds as if the question I generated means it is a myth that the water "has" to be from the cold water facuet.
Use a thermometer. =====================
The boy poured a bucket of cold water on himself to stay awake.
hot water contains more energy than cold water. cold water causes the water molegules to vibrate more.
It's best to use cold, tap water in your fountain :)
Cold water is preferable for washing out blood stains because warm water can actually set the stain into fabric fibers. You can also use cold water for treating blood stains on clothing before laundering them.
Short Answer: Yes. It is an enzyme based cleaner that was designed to use cold water. If the water is too hot, it will destroy the enzymes and be ineffective.
NO. PVC is for cold water only, CPVC is for hot or cold. I say forget the CPVC and just use pex.