Read the text and give a title

One method of heating a building is to circulate hot water through radiators which are located in each room. The water is heated in a boiler by a burner and is kept at a constant temperature by a thermostat device called an aquastat. The aquastat is located on the outlet pipe from the boiler. The pipe runs in a continuous loop from the boiler to the radiators and back to the boiler. The function of a radiator is to transfer the heat from the hot water to the air in the room. Therefore they are made of a material which has the property of high thermal conductivity. The shape of the radiator is also important because the greater the surface area the more rapidly it gives off heat. One type of radiator, called a fin tube, consists of a number of thin fins shaped like a circle which are welded to a pipe passing through their centres. A thermostat in the room can be set to the required temperature. When the air temperature in the room decreases, the thermostat switches on the pump which is located on the return line from the radiators. When the room reaches the set temperature, the thermostat switches off the pump. An expansion tank is provided to allow for expansion of the water as it heats. A safety valve, located on the pipe leading to this tank, serves to relieve the pressure in the boiler if it is too high.

Make true statements by matching these halves of sentences:

a) When the pump is switched on

b) When the temperature of the water in the boiler decreases

c) When the temperature of the water in the boiler reaches the set temperature

d) When the air temperature decreases

e) When the radiator is turned on

f) When the water in the boiler expands

g) When the boiler pressure is too high

the aquast at shuts down the burner.

the safety valve relieves the pressure.

the thermostat switches on the burner.

it flows into the expansion tank.

the aquast at starts up the burner.

heat is transferred from the hot water to the air in the room,

hot water flows through the pipe to the radiators.