In kitchens and bathrooms, mixer taps are more commonly used. In this case, hot and cold water from the two valves is mixed together before reaching the outlet, allowing the water to emerge at any temperature between that of the hot and cold water supplies.
For baths and showers, mixer taps frequently incorporate some sort of pressure balancing feature so that the hot/cold mixture ratio will not be affected by transient changes in the pressure of one or the other of the supplies. This helps avoid scalding or uncomfortable chilling as other water loads occur (such as the flushing of a toilet). Rather than two separate valves, mixer taps frequently use a single, more complex, valve controlled by a single handle (single handle mixer).
If separate taps are fitted, it may not be immediately clear which tap is hot and which is cold. The hot tap generally has a red indicator while the cold tap generally has a blue or green indicator. Mixer taps may have a red-blue stripe or arrows indicating which side will give hot and which cold.
Most bath faucets, lavatory faucets and kitchen-sink faucets are made with renewable seats which are replaceable when they become worn. Seats in faucets that are not removable may be reground with reseating tools.
Kitchen sink faucets come in a great variety of patterns. Concealed faucets are mounted underneath the sink; only handle flanges and spout are visible. Exposed faucets are mounted on top of the sink, with or without sprays.