Water heating is a heat transfer process that uses an energy source to heat water above its initial temperature. Typical domestic uses of hot water include cooking, cleaning, bathing, and space heating. In industry, hot water and water heated to steam have many uses.

Water is Too Hot 
This is likely related to the thermostat(s) where the temperature is set too high. Simply gain access to the thermostat and adjust as needed. This may also be needed when transitioning from cold to warm seasons. 

Water Takes Too Long to Reheat 
This is one of the downsides with electric water heaters. On average, recovery time (time it takes to reheat entire supply of water) on an electric model is double that of a comparable gas model. The amount of time it takes to heat up water can vary quite a bit between different models. Newer is usually better. 

Low Hot Water Pressure 
Most often, those reporting to have low hot water pressure have an older home with 1/2-inch diameter galvanized piping that enters and leaves the water heater. Since water pressure is automatically limited, the only solution is to install modern 3/4-inch piping which allows more water to flow through. 

Water Heater is Making Strange Noises 
If you hear popping, hissing, banging, knocking, or other strange noises from your water heater, it’s most commonly due to scale build-up on your heating elements or too much sediment build-up in the bottom of the tank. 

Dirty or Rusty Colored Water 
Rusty hot water is often a sign of corrosion of the anode rod or even tank itself. If left untreated, your water heater will most likely need replacing once the corrosion gets serious enough for the tank to develop a leak. Replacing the anode rod is easy to do and can add years to your water heater.