not if your heating with gas
and not if you have city water
The hot water warms the refrigerator, which forces it to turn on to cool it off.
Hot water
Not pure water - salt water can - hot or cold.
No, cold water is piped into the hot water tank and is heated by electricity or gas, it then flows out to the hot water taps.
thermopile
There are several possibilities; some of them indicate plumbing problems, and some of them are just consequences of physics. If the ceiling in the room with the shower drips all over during a hot shower, it may simply be that water vapor from the hot water is condensing on the relatively cool ceiling and dripping. If the ceiling in the room with the shower drips in a particular place, then it may be that the hot water pipe is leaking. (It's unusual for the hot water pipe to run through the ceiling instead of running up inside the wall, but it's not impossible.) It's also possible that it's condensation again, but that the condensation is only occurring at a particularly cool spot... perhaps where the ventilation system or a cold water pipe runs through the ceiling above. If the ceiling in the room underneath the shower drips after someone takes a shower, but only a hot shower, again it's probably the hot water pipe. If the celing in the room underneath the shower drips regardless of whether hot or cold water is used, then it's most likely a drip in the shower drain pan.
Hot WATER goes on the WATER bill, and making it probably goes on the electric bill.
I take it you are talking about the large (header) tank in your loft which feeds your hot water cylinder. If so its the ball valve leaking and needs a washer replacing. hope this helps. Gaz
Not significantly. Using less hot water in general will save.
Yes, your gas water heater will still distribute hot water.
yah but it's a waste of money
Yes, hot water usage is typically included in the electric bill as it is often heated using electricity.