evaporation
Yes, pH depends on the temperature.
I recently had water overflowing from my central heating header tank. I replaced the ballvalve, which had no effect. I isolated the water supply, and it still overflowed (about 1 gallon per week). In this situation, the only way for water to get into the central heating system was via the coil in the copper storage cylinder. If your central heating header is higher than your cold water storage, then it would happen the other way round. I hope this is not your problem, or you are competent at diy, as the plumbers will charge
Nothing because the microwave does not work when thy door is open.
Why would your hot water heater water while it's heating but doesn't when it isn't
no
In that case, it would be less efficient. Hot water rises to the top, mixing the water (if the heating element is at the bottom). When it is at the top, the water won't mix as well, and more heat would be wasted.
Water turns to ice.
Tankless water heaters work by quickly and efficiently heating water as it is demanded. They provide sufficient hot water because the heating implement goes on while water is turned on, avoiding the energy waste of tank water heaters.
The salt dissolves in the water, as its ionic bonds are broken when mixed with the polar water molecules. Heating the solution can speed up the dissolution process but does not significantly alter the chemical reaction. Heating the saltwater solution may also increase the rate of evaporation of the water.
Hot water baseboard heating is called a Hydronic heating system.
Sun heating water, normally for domestic use,
It dies. But it takes a while for it to die.