A heating circuit in which the flow and return pipes are completely separated until they connect to the boiler is known as a

A British Standard that includes detail on the requirements for installing open vented central heating systems in dwellings is

What is the recommended actual capacity of the feed and expansion cistern
in a small open vented indirect central heating system?

Which one of the following gas boilers overcomes the need for a cold water
storage cistern, feed and expansion cistern and hot water storage vessel?

What is the recommended maximum clip spacing distance for a vertical 15 mm copper pipe?

The Domestic Heating Compliance Guide supports which document?

Minimum controls which must be provided when replacing a gravity fed cylinder supplied from a gas boiler, as laid down in the Domestic Heating Compliance Guide, is

The minimum size of the cold feed pipe to a fully pumped heating system in a domestic dwelling is

A three-port mid-position valve can provide heated water to

What type of central heating control component is normally used in conjunction with a frost thermostat to conserve energy when exposed parts of a central heating system are required to be protected against frost damage?

Water in a wet central heating system is normally treated with

The method by which panel radiators transmit most of their heat is

The water level in the feed and expansion cistern of a central heating system should be set to allow sufficient room for

The normal position for a cylinder thermostat that is strapped to a cylinder is approximately

The type of heating system that uses 2 x two port motorised valves is known as a

Which component is used in a heating system fitted with a low water content boiler to ensure that a minimum water flow rate is maintained through the boiler heat exchanger at all times?

A central heating control component which can regulate the on/off periods of two or more zones in a system is known as a

Before you carry out a hydraulic pressure test on a new central heating system you should perform

The following diagram shows the actions of which component in a heating system?