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  • Publisher
  • Product CodeGVB1/16
  • Number of pages178
  • Publication DateMay 2016
  • ISBN9781906846732

GVB1/16 CIBSE Guide B1: Heating 2016


PDF Format







PDF Format






GVB1/16 CIBSE Guide B1: Heating 2016

Notice about delivery of hard copy publications during the current coronavirus situation

As a result of the coronavirus lockdown, we are only able to post hard copy publications every few weeks. Apologies for any inconvenience this may cause. To check on the status of your order, please email

The initial pdf of this omitted the Appendix 1.A1: Hydronic System Design and the Index to Guide B1. These are incorporated in a corrected pdf (see above) but to download these separatey click here. See also the 3 Corrigenda described below.

Guide B provides guidance on the practical design of heating, ventilation and air conditioning systems. It represents a consensus on what constitutes relevant good practice guidance. This has developed over more than 70 years, with the Steering Groups for each edition of the Guide expanding and pruning the content to reflect the evolution of technology and priorities.

Since the last edition of Guide B in 2005, the European Energy Performance of Buildings Directive has been introduced. This requires national building energy regulations to be based on calculations that integrate the impact of the building envelope and the building services systems, formalising what was already recognised as good design practice. In addition, the use of voluntary energy efficiency and sustainability indicators has increased. 

These changes have influenced the content of Guide B, but the emphasis remains on system design. 

Corridenda (May 2018)

Following a Corrigenda issued in November 2016, another was issued in May 2018. Pages amended are detailed below.

Corrigenda and reprints
November 2016 makes corrections to pages: 1-27, 1-30, 1-71, 1-89, 1-90, 1-99, 1-100, 1-106, 1-119 and 1-129
May 2018 (dated 14 May 2018) makes corrections to pages: 1-26, 1-37, 1-48, 1-49, 1-51, 1-74, 1-76,  1-153 and 1-163
June 2019 (dated 26 June 2019) makes amendments to page 1-147

The June 2019 Corrigenda itself can be downloaded here.

Purchasers of the hard copy will receive this with the book which will be incorporated in a repront at the earliest opportunity. The pdf of the Guide downloadable using the button above will be corrected with these changes and clearly identified as such.

Structure of the Guide

Guide B deals with systems to provide heating, ventilation and air conditioning services, and is divided into several chapters which are published separately. It will usually be necessary to refer to several – perhaps all – chapters since decisions based on one service will commonly affect the provision of others.

This edition of CIBSE Guide B was published in 2016 in five separate chapters plus a combined index across all five. These are:

  • Chapter B0: Applications and activities. This Chapter on how different types of building and different activities within buildings influence the choice of system. This chapter is now available in printed form, but can be freely downloaded as a pdf from the CIBSE website. For many activities and types of building, more detailed design information is available in specialist guidance.

Chapters B1 to B4 address issues relating to specific services. There are usually several possible design solutions to any situation, and the Guide does not attempt to be prescriptive but rather to highlight the strengths and weaknesses of different options. These are available as hard copy or pdf:

All chapters of CIBSE Guide B can be downloaded or purchased from our website.

Since August 2018 a full set of all 6 Chapters is available to purchase at a discounted price from here.

Guide B1 Heating

This document, which forms chapter 1 of CIBSE Guide B, deals with the selection, design, commissioning, operation and management of most types of heating systems in buildings. It deals specifically with nondomestic buildings though much of the contents will apply to domestic communal heating. Such systems provide space (including ventilation) heating and/or hot water services and installations such as swimming pools. Virtually every building (outside the tropics), contains a heating system. In most cases its primary purpose is to produce acceptable levels of thermal comfort – paramount for the health and wellbeing of building occupants and provide domestic hot water – or to protect the building fabric or its contents.

Contents of Guide B1:

1.1 Introduction

1.1.1 General

1.1.2 Other CIBSE publications

1.2 Strategic design decisions

1.2.1 General

1.2.2 Purposes of heating systems

1.2.3 External design conditions

1.2.4 Site related issues

1.2.5 Interaction with building design, fabric, services and facilities

1.2.6 Occupancy

1.2.7 UK regulatory requirements

1.2.8 Energy performance of building regulations outside the UK

1.2.9 Environmental performance targets

1.2.10 Economic considerations

1.2.11 Future requirements

1.3 Design criteria

1.3.1 General

1.3.2 Internal design conditions

1.3.3 Design criteria for human comfort and well being

1.3.4 Design criteria for other than human comfort

1.3.5 Environmental performance target

1.3.6 Part L Building Regulations 2013 (England)

1.3.7 Energy and CO2 emissions benchmarks for existing buildings

1.3.8 NOx, SOx, particulates and greenhouse gases other than CO2

1.3.9 Environmental assessment schemes

1.4 Choice of system

1.4.1 General

1.4.2 System classification

1.4.3 Choice of centralised or decentralised systems

1.4.4 Particular applications

1.4.5 Choice of fuel or energy source

1.4.6 Choice of heat generator

1.4.7 Choice of heat emitters

1.4.8 Choice of distribution medium

1.4.9 Choice of domestic hot water system

1.5 Heating load calculations and sizing methodology

1.5.1 General

1.5.2 Calculation principles

1.5.3 Room design heating load

1.5.4 Mechanical ventilation heat loss

1.5.5 Domestic hot water

1.5.6 Distribution losses

1.5.7 Heat generator peak heating load

1.5.8 Design margins

1.5.9 Choice of number and duties of heat generators

1.6 Energy sources

1.6.1 General

1.6.2 Factors affecting choice of energy source

1.6.3 Gaseous fuels

1.6.4 Liquid fuels

1.6.5 Solid fuels

1.6.6 Electricity

1.6.7 Solar source

1.6.8 Handling and storage of fuels and regulations

1.7 Heat generators

1.7.1 Choice of heat source

1.7.2 Boilers

1.7.3 Gasfired boilers

1.7.4 Oil fired boilers

1.7.5 Solid fuel boilers (general)

1.7.6 Solid fuel boilers (biomass)

1.7.7 Steam boilers

1.7.8 Combustion of fuels

1.7.9 Heat pumps

1.7.10 Combined heat and power

1.7.11 Solar water heating collectors

1.7.12 Chimneys and flues

1.7.13 Corrosion in boilers, flues and chimneys

1.8 Hydronic systems

1.8.1 General

1.8.2 Choice of flow and return water temperatures

1.8.3 General arrangement of LTHW systems

1.8.4 Secondary circuit(s)

1.8.5 Primary circuit

1.8.6 Interface between primary and secondary circuits

1.8.7 General arrangement of MTHW and HTHW systems

1.8.8 Integration of renewable/low carbon heat generators

1.8.9 Heat output rate of heat emitters

1.9 Steam systems

1.9.1 General

1.9.2 System design

1.9.3 Distribution

1.9.4 Condensate

1.9.5 Guidance and standards

1.10 Air systems

1.10.1 General

1.10.2 Heat sources

1.10.3 Distribution

1.10.4 Heating combined with air conditioning

1.10.5 Controls

1.10.6 Other standards and guidance

1.11 Unitary systems

1.11.1 General

1.11.2 Indirect gas and oilfired heaters

1.11.3 Direct electric heaters

1.11.4 Electric underfloor heating

1.11.5 Standalone heat pumps

1.11.6 Radiant systems characteristics

1.11.7 Convective heating characteristics

1.11.8 Controls

1.12 Domestic hot water systems

1.12.1 General

1.12.2 Classification of DHW systems

1.12.3 Regulations relevant to DHW systems

1.12.4 Generic dhw systems

1.12.5 Choice of dhw system

1.12.6 dhw demand and energy consumption

1.12.7 Solar hot water heating

1.12.8 Sizing of dhw systems

1.13 Connecting to heat networks

1.13.1 Introduction

1.13.2 Existing UK heat network performance

1.13.3 Key design points for heat networks

1.13.4 Networkconsumer interface

1.13.5 Implications for design of building heating system

1.14 Operation, maintenance and energy management

1.14.1 General

1.14.2 ‘Commissionability’ and ‘maintainability’

1.14.3 Life cycle issues

1.14.4 Construction (Design and Management) Regulations (UK)

1.14.5 Operation and maintenance manuals

1.14.6 Log books

1.14.7 Energy management, monitoring and targeting

Appendix 1.A1 Hydronic system design


Guide B1 Steering Committee:

Mike Campbell (Chair), Paul Barnard, Robin Curtis, Richard Davies, Tony Day, David Hughes, Simon Mitchell, David Palmer, Chris Parsloe, Martin Ratcliffe, Martin Wilkinson, Paul Woods, 


Richard Brailsford, Peter Clackett, Will Pitt