I replaced kitchen faucet as I thought water flow problem was faucet so faucet is new. The hot water heater is in garage next to kitchen and is about 4 years old, but unused for last 2 years. I turned on faucet in kitchen and it runs a few minutes then flow slows to a stop using hot water, it runs cold water however it is very reduced in flow. The tub water runs fine in the bathroom but the hot water does not run in that bathroom sink or in my other bathroom sink. I can not figure it out, hope you can help. The house has copper pipes.Thanks lots.