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Several conditions contribute. Distance your shower stall is from the hot water heater. Type and age and size of pipe to your shower stall from your hot water heater and climate. Cold weather climate tends to cool the static water in the pipes while waiting to be turned on. Old pipes have a build up of rust / minerals inside slowing the normal flow. Distance, well it takes a while for the hot water to leave the tank and get to the faucet especially if the other two factors are involved.
If you can, insulate the pipes. This will help save energy and keep the water in the pipes hotter longer. If the water still takes an unacceptable time to warm up (Assuming you're only running the hot water to warm it up) you can buy a circulation pump that circulates water from the hot line to the water heater through the cold line. This means that you'll have hot water at the hot tap immediatly. (Actually, the circ pumps I've ssen for this job are usually timed) The down side is you'll also have hot water on the cold faucet too! If you can install a return line (basically another cold water line connected at the inlet to the water heater) the pump idea will work very well.
Turn on the hot water to the lav. and or tub. Then shut off faucet when water gets hot. It only takes a few seconds to do this. Then your shower will have hot water very fast.
The pressure reading of a hot water tank will also contribute to this problem. If the pressure is low and if distance is a problem this could equate for the long time for it to arrive. However, nowadays because of technology, most hot water tanks are made to the maximum pressure rating (600kpa) thus solving this problem. The idea above about opening a bath tap first is also a good idea.
What else can I help you with?
What causes variable hot water temperatures while a shower is running and no other water is running?
means you are running out of hot water
Have you ever experienced the frustration of running out of hot water in the middle of a shower?
Yes, have you ever run out of hot water during a shower?
Why does the hot water keep running out so quickly in my shower?
The hot water in your shower may be running out quickly due to a small water heater, high demand for hot water in your household, or a malfunctioning heating element in the water heater.
What causes hot water to decrease while taking a shower?
You are running the water heater out of hot water faster than it can heat the incoming cold water.
Can smoking with the hot shower running stop the smell?
No. All you get is smoke and steam. Not smoking stops the smell. Running water like that waste water as well.
Does the shower only have hot water available?
No, the shower has both hot and cold water available.
Why does the hot water not last long in the shower?
The hot water in the shower does not last long because the water heater has a limited capacity to heat and store hot water, which can be quickly used up when taking a shower.
Why is the shower water not hot enough?
The shower water may not be hot enough due to issues with the water heater, such as a malfunction or setting adjustment.
How did pioneers take a shower?
They didn't shower. No one did in the 1800's. People washed in tubs of water or did a wash cloth type cleaning. Remember there was no running hot water so water had to be heated by bucketfuls to take a warm bath.
Why does the hot water in my shower not last long?
The hot water in your shower may not last long due to a small water heater, high demand for hot water, or a malfunctioning heating element.
Why is the shower turned off but the water is still running?
The shower is turned off but the water is still running because there may be a leak in the faucet or showerhead, causing water to continue flowing even when the shower is not in use.
Why does the hot water run out so fast in my shower?
The hot water runs out quickly in your shower because the water heater may be too small to meet the demand of hot water needed for a long shower. This can also happen if there are multiple people using hot water at the same time in your home.
