The minimum diameter of the primary flow and return pipework from a high output solid fuel boiler, to an indirect cylinder, is

The requirements of single feed indirect copper cylinders can be found in

Which one of the following domestic systems is outside the scope of BS 6700?

A device used within a storage vessel that creates an air lock to prevent primary water mixing with the hot supply, would be found in a

The main reason that 'dead legs' are best avoided in the layout of hot water systems is

Refer to Figure 1. The BS symbol shown is

The drain valve which permits the secondary circuit of an indirect hot water storage cylinder to be emptied, should be

Which one of the following grades of copper pipe would be the most suitable for producing the open vent pipe connection to a cold water storage cistern without fittings?

The purpose of a fullway gate valve is to

A shower booster pump with twin impellor is

The loss of air seal in a single feed indirect cylinder, can be remedied by

One method of preventing backflow on a mains fed shower is to fit a

14 Pillar taps to a washbasin are to be replaced with a mixer tap that mixes water in the body of the tap. The hot tap is supplied from storage and the cold tap from the supply pipe. The type of valve that must be fitted to the hot and cold basin pipework is a

When testing rigid pipe installations, what is the period of time that the system should be left to stand, between charging to the required test pressure and taking a further reading?

When decommissioning a primary circuit to an indirect hot water storage vessel, a fullway gate valve is identified on the cold feed pipe from the feed and expansion cistern. What action should be taken?

A plumber needs to turn off the hot water supply to an office block canteen. Which of the following would be the most appropriate to advise first?

18 Work is to begin on replacing a shower mixer valve which is supplied from an old galvanised cold water storage cistern (CWSC). Which one of the following, details the action that should be taken before replacing the shower?

When installing a fullway gate valve following the temporary decommissioning of a system, it is a Water Regulation requirement that it is

A combination boiler is to replace a conventional indirect hot water heating system. The best method of terminating the cold water supply to the two storage cisterns would be to

With reference to contract work on a factory, a record of permanent decommissioning of a plumbing system should be given by the plumbing company to the

Which one of the following documents states the requirements for insulating exposed domestic hot water system pipework?

A routine maintenance inspection reveals corroded and scaled lead pipework. The best option to avoid future problems would be to

System noise in a direct hot water system installed in a hard water area, is most likely to be caused by lime scale deposits in the

To confirm the safe isolation of an electrical immersion heater a plumber would use a

Which one of the following types of hot water system components would contain a coil type heat exchanger?

At what temperature will an immersion heater thermostat usually be set?

Which one of the following should be used to measure the temperature of a primary hot water circulator?

When replacing an immersion heater in a hot water storage cylinder, a plumber finds that the heater cannot be easily removed. Which of the following will ensure a minimum of damage to the cylinder boss in order to remove the heater?

Flow rates for an instantaneous electric water heater would be found in the

The purpose of a packing gland on a hot water pillar tap is to

Which one of the following system components uses replacement washers as a maintenance activity?

A plumbing company has a contract to maintain the hot water systems in a block of flats. The type of work to be undertaken would be stated in the

When a new instantaneous water heater supplied by the plumbing company fails to operate, a plumbing operative should

Refer to Figure 2. The recommended minimum distance ‘X’ from the cylinder top connection to the vertical open vent pipe shown, is

Refer to Figure 2. The pipework arrangement shown is required in order to prevent

The working separation in a single feed indirect hot water storage cylinder is based on

A hot tap is opened and there is no water flow. The tap has not been used for some time and all other taps are working. The most likely cause of the problem is that the

An old brass drain valve fitted directly to a copper combination storage vessel has sheared off during the draining down process. This is most likely to have been caused by

The temperature of the hot water from the hot tap can be increased by turning up the

The pressure at the outlet of a gravity fed thermostatic shower is extremely poor. An investigation reveals that the head is only 440 mm. To satisfy minimum recommended head requirements, the cold water storage cistern would usually have to be raised by another

When an indirectly supplied cold tap is turned on at the washbasin mixer tap, the water runs warm for a short period, on some occasions. The most likely reason is that

If a live supply accidentally touched the neutral terminal on a properly earthed instantaneous electric shower, the result would be that the

Before starting work in a customer’s bathroom, the plumber notices a wall mounted electric double pole switch to the shower hanging loosely on exposed cables. The most appropriate course of action would be to

Information regarding approved jointing materials for hot water systems can be obtained from