A small amount to keep the pilot light going.
You are running the water heater out of hot water faster than it can heat the incoming cold water.
means you are running out of hot water
Please be more specific ... heater gives off heat, then cold air OR The heater fan runs for awhile then stops running
I am going to assume that you are pondering why the heater only maintains heat while the engine is running. The answer is quite simple. The engine uses a combination of anti-freeze and water to help keep it cool. The water is circulated by a water pump. The hot water moves through the heater core, which is a small radiator. The blower draws air through the fins of the heater core and heat is pulled from it. The water pump is usually belt driven, and the engine must be on in order for the coolant to circulate.
The meaning of running water is that the water is moving and not standing still. Running water is what comes out of a faucet while water in a bowl is just called water.
The kitchen sink is the farthest appliance from the water heater. Have a plumber install a circulating pump under the sink for instant hot water.
Is it a Fast Food Establishment? If it is, then Yes. I once worked for a Fast Food establishment that was shut down for a day because the hot water heater stopped working while the inspector was there.
All the energy gels are is a easy to consume and digest gel that provides caloric energy. or in less scientific terms, its easy to eat while running food that gives you energy. As you run your body burns calories and thus to continue to have energy while running longer distances easy to consume/digest forms of energy can be beneficial. For the average runner 100 calories / 45 minutes or running can maintain your energy level which conveniently is the size most energy gel packets come in. However all they really come down to is a different form for food that is easier to consume while running, no real magic.
You run out hot water because you must have a small water heater. A water heater gets water, and heats it up, so if you have a small one, then once you use up all the hot water, you need to wait a while for the heater to heat up more.
drain the water tank
Why would your hot water heater water while it's heating but doesn't when it isn't
get the hose running over the car while you sit inside and check for various places where the water is coming, it coule also be coming in from under the car. This is usually caused by a leaking heater core. If the above doesn't reveal anything, then the heater core is suspect.