Observation

Most of the candidates were able to:

• state the purpose of ball valve in plumbing;
• list four types of ball valve.

However some of them were unable to:

• sketch a multi-point storage water heater and label the following parts:

(i)         cold water storage cistern;
(ii)        boiler.

• explain a circulator heater

                        The required response to questions 4. (b) and (c) are given below.

   .(b)sketch of a multi-point storage water heater and labelling of:

(c) Explanation of a circulator heater;
                        A circulator heater is connected to the hot water storage cylinder or tank with a flow and return pipe. The heater may provide the sole means of providing hot water or be used as a booster to a solid fuel boiler.