I can get hot water in 1st floor bathroom and kitchen sinks but 1st and 2nd floor showers no hot water nor 2nd floor sink please help

In the area of the water heater, can you see the pipes? Can you tell if the water going to the kitchen and the first floor bath are on one pipe and the water going to the 1st and 2nd floor baths are on another? Are there any valves on these pipes?

Found out the promblem calcium depposit in lines thanks for answering though