Proper Installation of a Header Tank

Radiators

• Header tanks on radiators help prevent the loss of coolant. Header tanks on radiators also provide extra space for coolant to expand, reducing the risk of a pressure rupture. "Light and Heavy Vehicle Technology" states: "In modern practice, the header tank proper may be mounted separately from the radiator."

Engines

• Header tanks are used in both oil tanks and fuel tanks. Header tanks can hold the initial amount of fuel required for an engine to start. Header tanks acting as a bubble trap must allow air to escape. Fuel header tanks in aircraft must be installed so they feed fuel when the aircraft is upside down and the main fuel lines don't work.

Water

• Header tanks for home water use capture rain water or store water for use in the home. The water tank can be in a loft or on the roof. It must be installed at a level higher than any water usage. Water from the header tank is gravity fed to the rest of the home.

Calorifier

• A calorifier uses waste engine heat to heat water for use elsewhere in a craft or building. The water does not come into contact with the engine. Engine coolant flows through a pipe in the calorifier before cycling back to the engine. According to "How to Install a New Diesel Engine," "...you should install a calorifier with its coil on the same level as, or below, the engine cooling header tank".