First off, you do have something heating your hot water! I would start by checking the restrictor/strainer in the showerhead. unscrew the showerhead from the shower arm and check for debris clogging it. After that I would follow the path back to the water source to see what is causing the problem. You may be wanting a plumber.
Mixer valve
The shower valve needs to be repaired! As for the water not shutting off when you turned off the main that is also needing replacement when it shut of by turning on other faucets you were simply diverting the flow from the leaking main shut off.
Temperature balance shower body needs to be adjusted
There is rust in the steel pipes of your house, possibly the water heater. Have them looked at soon
The only thing that could cause this is outside air has leaked into the house and is cooling off the pipes. If the water heater is producing the temp that is set on the thermostat, then it will come out the same temp everywhere, unless you just think the faucets are getting hotter. If your water heater is electric, the elements could be getting bad or dirty from hard water,which will cause inefficient heating. But besides this,only cold air could cause the pipes to cool.
Have you got two single faucets or a single lever faucet? It could be a pressure imbalance or it could just need maintenance
No, in a typical plumbing system, the main water line does not go to the water heater first. The main water line usually goes directly to the faucets and fixtures in the house, and a separate line connects to the water heater to supply it with water.
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AnswerIt could be a blocked pipe or a damaged valve. Do you get hot water in other areas of the house? If not, check the valve on the water heater. If other parts of the house get hot water, replace the hot water valve assembly or repair the hot water valve. If you have hot water at the sink, but not in the shower, the hot water side of the shower valve is clogged by something like rust. Esp. if you have had the hw heater replaced. and you have galvanized pipe instead of copper. Esp if your sink aerators get clogged by rust particles.Search for fixing Delta faucets, open up the valve, and flush out the rust.Buy a kit for replacing parts while you have it opened up.
Moen faucets are very modern and stylish. It is possible that they will have a great appearance to match your house. You can also look at Kohler faucets.
To effectively winterize your house plumbing, you can insulate exposed pipes, seal any drafts, and drain outdoor faucets. Additionally, keep your home heated to prevent freezing and consider using heat tape or a space heater in vulnerable areas.
My wife wants to buy some kitchen faucets for our new house. Where can I purchase such items cheap in the US?