Why isn't my electric hot water tank producing hot water?
Hot water will depend on the recovery time of the heater. Being off, it will take longer than normal since there is no residual heat. Does this water heater have any adjustable settings, an off, vacation or hold, or adjustable thermostat? I suggest waiting about half a day and see what it does. If it still is cold water temp, you have a wiring or element issue. If it is warm, wait until the next day and test again. If it's hot, you're good, still warm? Check elements or settings (if it has any). 

As for pressure, have the water off, and I assume drained from the plumbing, you may have sediment washed into the aerator or valves. Pull your aerator of each sink, if it can be, and check for sediment. Clean and reinstall. If that doesn't help, try to open and close the valves under the sink a few times, check the aerator again.