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So you have 2 heating elements in your hot water heater. A top and a bottom. From the sounds of it your top element has went bad however they are only about $17 a piece new and it is recommended you replace both at the same time. Thats why it takes you long run to get hot water the top water heater water is still cold and long run gets to the bottom and gives you hot water.
If the water temp is fluctuating from very hot and cool the problem could lie with a blockage in the inlet to the shower, scale inside the heater can, shower hose needs replacing or the shower head needs to be cleaned The problem is a "slowing" of the water across the heating elements which causes the water to pick up too much heat
Your hot water must come from your coil in boiler and not from a seperate hot water heater - more then likely furnace hasn't been on for heating your house nor has it been on for any draw of hot water. You have to wait till it goes on and brings the water temperature up to your setting or get a hot water tank put in or a new type wall mounted gas instant hot water unit.
I had the same problem. It was my heater/boiler this one runs my home heating and water. There's a 3 way gateway for central heating and hot water for shower etc. Probaly you got a aire bubble in there. Find the 3 way gateway and give it a knock, the bubble will disapear and the hot water will flow again. I'm sorry for my english but i'm Dutch.
There is something caught in the hot side of the faucet manifold (main faucet body). You have to remove the trim and guts to access it. Use a flash light and look inside. Hopefully you can find the object. Oh by the way, you need to turn the water off to the whole house to do this. If you don't see anything have someone turn on the water slowly with the valve out of the manifold to rinse out the pipe leading to the valve body. Hopefully it will remove whats in there. If what you see is a white looking material that is stiff but brittle, then it's from the water heater and the water heater needs to be replaced. Sometimes there can be small stones that get "washed" into the lines when the main is worked on within the area of your home. But most likey it's from the water heater. Good luck! Don't forget to turn the water off before you remove the faucet guts.
This is a problem that should be looked at by a Pro. I don't know if you have a water heater or you are getting your hot water from a domestic coil on a boiler. "Your home heating unit" It is hard to give a solution to this problem without seeing it.