What percentage of system size should an external expansion vessel be a minimum of?

The system compromises of a cylinder in which a vent pipe comes off the hot distribution pipe

The secondary water is heated via primary coil through convection

The Secondary water is heated via an immersion heater

The average UK domestic immersion heater is 3kw

What are the 3 different tiers of safety in an unvented system

What temperature does a temperature relief valve discharge at?

What temperature is secondary water once heated in the cylinder

D1 pipework from the Temperature relief valve and Expansion relief valve can be joined togther

D2 pipework should be at least one pipe size greater than D1

2 advantages to an unvented system are

2 advantages to a vented system are

The term double-feed system means

that there are two cold feeds supplying

water to the system.

In a Double Fed system the cold feed to the primary pipework is supplied via what?

An open vent pipe must be a minimum of 22mm?

All cylinders must be manufactured to which Building Reg

An ascending spray bidet can be installed within a system using a combi boiler

Where on a domestic hot water cylinder should the cold feed be connected

What is meant by the term heat recovery

A connection for a secondary return is a made 1/4 of the way down a cylinder. Alternatively a connection can be made via which fitting?

A bronze pump is used on a secondary return

Building Reg part G states that all new domestic dwellings must have a TMV on the bath, what temperature must it not exceed

On an unvented cylinder, a discharge valve must be located within how many mm of a tundish

Fill in the Blank:

There must be a ............... vertical pipe from the tundish to the first bend on the d2 pipework

Diaphragm and Bladder are 2 different types of what

D1 & D2 pipework must have a minimum fall of what?

Trace Heating can be used as an alternative to a Secondary Return

The co-efficient of Linear Expansion for copper is

Which cylinder can a central heating inhibitor NOT be added to the system?

Which cylinder is said to work in 'reverse'

The following 2 statements best describe which type of cylinder:

The main problem with this type of cylinder is the lack of water pressure at the taps due to the lack of head height.

These cannot be attached to a pump, due to the cold water storage capacity.

What is the minimum size supply pipe from the CWSC to the Cylinder

A high limit stat activates the closure of the 2 port valve in the event of secondary water overheating in an indirect system

A CWSC supplying a hot water cylinder only should be a minimum of what size?