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If the electrical panel is within site of the water heater then no shut off needed. Just turn off the breaker.

You don't need a 40 amp breaker in the sub panel. You need a 40 amp breaker in the panel feeding the sub panel. Where are getting the info that you need a main in the sub panel? I am not aware of that rule.

It is a crimp connection. You can't disconnect it unless you saw it off.

In my opinion a mag starter is the wrong device for the compressor. All you need is a disconnect on the wall and the pressure switch turns the motor on and off.

most like they are for drainage to allow any water build up to drain from behind the wall.

Your sevice can supply up the value of your main breaker.

If you use 14/2 then you must use a 15 amp breaker. If you want 20 amps then you must use #12 for all the cables.

The first two option are not to code. I would not use anyone who suggested that option. When replacing the panel you have to meet the clearance requirements. Option 3 is the best. You can use GFCI breakers and replace the receptacle with three prong versions. they will not be grounded but will...

Use a rubber coupling. You can slide it onto one pipe, align them and slide back onto the other pipe. They come in all sizes and brands.

You can install panels direct to the stud.

The powder will brush off but then you need to address the moisture issue. Find where it is coming from and repair the issue. If this is a basement maybe all you need is a dehumidifier.

It is effervescence from moisture.

It is not against code to use 10 on a 20 amp circuit but as you have discovered, working with #10 is a pain for lighting.

It could be the power to the dryer. If one of the hot lines is out the motor will still run but no heat. I would try turning off the breaker and back on as a first step.

You will get different results from different search engines. I normally use duckduckgo, but if I am not getting results I will try google.

There could be reasons the brick was needed such as fire stopping or support column.

With no heat you need to get the water out of traps or they will freeze and crack.

The traps under the sinks and tubs and the toilet should be drained and filled with rv antifreeze. Only the toilet bowl needs antifreeze. The tank can be left empty.

pressure washer??

I would take the chain and bar off and brush and scrape. Then reassemble.