Energy efficiency for gas-fired
and oil-fired domestic heating
and hot water systems
Session B:
Course recap and revision
Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems
Session B – course recap and revision
Session objectives and activities
During this session you will:
• Be briefed on the end of course assessment
• Revise topics covered throughout the course
• Complete practice calculations
• Have opportunities to ask about anything from the
course you are unsure about
Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems
Session B – course recap and revision
End of course assessment
•
The end of course test is designed to confirm your knowledge of topics
covered throughout the course.
•
•
Keep calm and read each question carefully.
We will review key points from the course today and go through some
practice calculations.
•
It is recommended that you complete additional revision outside of class.
•
You may find it useful in your revision to:
• review materials in your course handbook
• revisit key regulations and associated guidance online
• make sure you are familiar with key regulatory criteria (including
important numbers)
• ensure you are familiar with key calculation methods
• talk to colleagues and other students about the course
Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems
Session B – course recap and revision
End of course assessment
Having completed this course you should know about:
• the regulatory requirements and sources of guidance for energy
efficiency standards for gas-fired and oil-fired heating appliances
connected to ‘wet’ heating circuits
• the requirements of minimum boiler efficiency standards for gasfired and oil-fired heating appliances connected to ‘wet’ heating
circuits
• how able to determine if a non-condensing boiler installation would
be acceptable
• the requirement relating to space heating primary circuits type and
design for gas-fired and oil-fired ‘wet’ heating systems
• the compliance standards requirement for hot water storage vessels
Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems
Session B – course recap and revision
End of course assessment (continued)
Having completed this course you should know about:
• the requirements relating to the preparation and water treatment of
hot water systems and wet central heating systems
• the requirements relating to the commissioning of hot water systems
and wet central heating systems
• the requirements of the minimum standards for the control of gasfired and oil-fired wet central heating systems
• the requirements of the minimum standards for insulation of
pipework for gas-fired and oil-fired wet central heating and hot water
storage systems
• the requirements relating to stand-alone, glandless heating systems
circulators
Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems
Session B – course recap and revision
Regulatory requirements and sources of guidance for energy efficiency
standards for gas-fired and oil-fired heating appliances connected to
‘wet’ heating circuits
Key websites:
• https://www.gov.uk/government/organisations/department-forcommunities-and-local-government
Key points to remember:
• Revision documents are available to you via the resource material or
web link previously given.
• Regulatory documents L1A (New Dwellings) and L1B (Existing
Dwellings) should be researched / read.
• Regulatory document Domestic Building Services Compliance
Guide is the key document to the majority of information required for
this course.
Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems
Session B – course recap and revision
Non-condensing and condensing boiler installations
Key points to remember:
• Where installation of a condensing boiler may be difficult, an assessment should be
completed to see if a non-condensing boiler would be allowed
• If it is suspected that a building may not be suitable for a condensing boiler, a
standard form must be completed to assess whether a non-condensing boiler can be
fitted for a specified fuel.
• Compared to non-condensing boilers, condensing boilers:
– discharge gases from the flue terminal which are cooler, less buoyant and often
form a visible plume
– discharge gases which may wet surfaces too close to the terminal, or be a
nuisance to neighbouring property or people passing nearby
– cannot use a flue designed for a non-condensing boiler or share a flue with a
non-condensing boiler
– form liquid condensate within the boiler which must be discharged to a suitable
drain or soak away
Key websites:
• The Guide to the Condensing Boiler Installation Assessment Procedure for Dwellings
www.planningportal.gov.uk/uploads/br/BR_PDF_PTL_CONDBOILER.pdf
• Appendix G of Part L of the Building Regulations – form for assessing when noncondensing boilers are permitted
www.planningportal.gov.uk/buildingregulations/approveddocuments/partl/approved
Energy efficiency for gas-fired and oil-fired domestic heating and hot water systems
Session B – course recap and revision
Non-condensing and condensing boiler installations
Example calculation:
Use the form - Appendix G of Part L of the Building Regulations and the
following example to work out whether a condensing boiler would be allowed