Yes you should because it MAYBE start a fire.
Yes why pay to heat the water while you are away. safer too
Because it is burning.
A leaking water heater can be very dangerous and should not be used if it is leaking. Also, you should clean the leakage and keep it away from any other electronics.
Yes. I would. If you are replacing the hot water lines, it is also a good time to drain the hot water heater and get rid of all the junk at the bottom of the hot water heater. That should be done once a year. Your hot water heater must be off when you do that, your hot water heater should be off when you drain your hot water heater. You will see boiler scale come out of your water heater. Leaving the boiler scale in your water heater makes it less efficient. It makes it harder to heat your water. It is the same as throwing money down the drain. If you want to give your money away, you should give it to the Salvation Army instead of the Utility Company.
A solar water heater reduces the amount of electricity required to heat a given amount of water. Essentially its a preheater. Though during the summer water heating is almost completely unnecessary.
From 100 to 150 mm from the front face of the baseboard heater.
no.....??
18 inches
You could do it with 8-gauge wire, assuming you could even get a 110v water heater like that--4000-watt water heaters are all 220v.
It erodes it- wears it away over a period of time.
That depends on how far away is the fixture requiring hot water as a tankless has no return circulation thus your using a lot of water that cools on longer runs. It also would depend on the fixture units required ( GPM max and min flow)
Go to your doctor straight away.
No. Not directly. It needs to be 18 inches away... in length, not distance according to the UPC. An 18 inch water heater flex would work or 18 inches of copper tube with a pex adapter on the end will work.