I just recently bought a house and since we moved in it hasn't had any cold water. When I turn on the cold water in the kitchen sink it stays cold for about 20 seconds then it gets hot. Then no matter what position the handle is at it stays the same temperature. My shower is the same way I can't change the temperature by turning the nozzle, it just stays at one constant hot temperature. The other day I noticed that the water in the toilet is hot too. What could be the problem here?