Your H/W tank is sludged up. If you haven't cleaned it for along while this is common. Cleaning it now may do the trick -Try this, -
Drain a H/W tankYou first turn OFF the power to tank, then attach a hose pipe to the bottom fitting, lead it outside or to any drain, turn on the valve by it, turn OFF your inlet valve and open the relief valve so air can enter the H/W tank.Let the whole tank empty -takes about 30 -40 minutes. Next, when empty turn ON the inlet valve and let cold water run through the tank and out the hose, now you will see the sludge coming out. Let this run 5-7 minutes or until water is coming through clean. Now you are done . Let it fill, then turn on power.
That water is used in the cold taps in your bathroom and for the heated water you use. Don't drink from these taps.
if someone put in a hot water tank they may have the lines switched.
Usually there are no letters on French taps; some old taps bear the letters C (for chaud = hot) and F (froid = cold). Hot water taps are always located on the left side, cold water taps on the right. It is also standard to find color marks (blue for cold, red for hot) on the taps. On newer models, having a central lever instead of two taps, you turn the lever to the left for hot water and to the right for more cold water. Also the blue and red marks may be found on these type of taps.
The aerator to the cold taps may be jammed, otherwise check to see that the cold water valve is switched on.
Singapore's 4 national taps Singapore's 4 national taps are:1) Water from local catchment2) Imported water from Johor3) Desalinated water from the sea4) Reclaimed/Recycled water from local waste water (NEWater)
Possibly your hot water tank is rusting out on the inside and will need replacement soon.
You call them
taps
Taps need not be made with metal.... But most taps are because they don't melt if hot water passes through............
Check the upstairs taps for blockage in aerator or internally.
turn of taps
The four national taps are the Local Catchment water, Imported water, NEWater and Desalinated water.