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Boiler Identification Stroma Certification Ltd CPD Assessment Guide: Boiler Identification This Guide explains boiler identification and use of PCDF according to the RdSAP software. There is a question section at the end of the Guide for you to complete in order to pass this section of the CPD. If you have any questions regarding boiler identification that are not covered in this Guide, please email [email protected] with details of your enquiry. Alternatively, please call Stroma Certification on 0845 621 11 11. Date: 24 October 2014 Revision: v1.1 © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 1 of 22 Contents Regular Boilers ................................................................................................................................................ 3 Combi Boilers .................................................................................................................................................. 6 Condensing Boilers ......................................................................................................................................... 7 CPSU – Combined Power and Storage Units ............................................................................................. 10 Electric Central Heating ................................................................................................................................ 10 Types of Electric Boiler ................................................................................................................................. 11 Heating systems: Boiler Identification ........................................................................................................ 12 The PCDF Method .......................................................................................................................................... 13 SAP Table Data Entry Method ...................................................................................................................... 14 Boiler Identification Question Sheet ............................................................................................................ 18 © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 2 of 22 One area of audit failure is when a boiler is incorrectly identified. This can lead to a variance in the rating and/or the recommendations on the EPC. If the rating varies by more than 5 SAP points or if there is an incorrect recommendation (or lack of correct recommendation), then the EPC will fail for technical reasons and you will need to relodge the report. It is therefore vital that you identify the boiler correctly. This document will focus on the heating systems that are identifiable via the PCDF database and via the SAP table method. It will also focus on the traditional heating systems involving a boiler. Any heating system that can ONLY be inputted via the SAP table method is not included. The rarer systems are also not covered. You should consult the RdSAP Methodology Manual, located in the Stroma members area, for a more detailed breakdown of all heating systems available in RdSAP. Let’s begin by looking at the type of boiler in a domestic property. Boilers are split into two types of system: Regular/standard boilers (sometimes called system boilers) Combi boilers Regular Boilers If you assess a property with a regular boiler (this is a boiler that does space heating only). The water heating should be provided by the main system, even if the tank has an immersion heater. This is assumed to heat the water in summer and should not be selected. Heating Cold water header tank storage Hot water Hot water cylinder Control valve Radiators Conventional boiler: Oil or gas fired A regular boiler can be described and identified as: The boiler heats the water that flows around the heating and hot water systems. The water used for heating is fed from a header or feed tank usually found in the loft. As the water flows around the heating system, it expands. An expansion pipe is fitted to the heating system to discharge any build up in pressure in the system to the header tank. More modern sealed systems do not require the feed/expansion tank as they have expansion vessels instead. © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 3 of 22 Key ways to identify a regular boiler: Usually only 3 pipes (gas supply, flow and return) Hot water tank usually present Simple boiler design – few controls on boiler Data Entry You should always record the heating system via the PCDF method if you can identify the make and model of the boiler. A photograph should be taken to prove this. If you cannot locate the boiler in the PCDF or the boiler has no make and/or model qualifier then you should use the SAP table data entry method. Regular Boiler with no cylinder located As mentioned above, you would typically find this type of boiler in conjunction with a hot water cylinder. From time to time, you may find that you cannot locate the cylinder. In this case please enter the following: Water Heating type – From Main Heating System Cylinder Size – No Access © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 4 of 22 Your site notes should back this up (i.e. a relevant note or photo showing suspected location). If you can be sure that the cylinder has been removed, then you need to do the following in the RSAP+ software: Water Heating Type – No Water Heating Present You will need to document this adequately in your site notes – i.e. annotated photo showing space where cylinder should be with disconnected pipework. © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 5 of 22 Combi Boilers Combi (combination) boilers are standalone boilers that provide space and water heating and will not be connected to a cylinder for storing hot water. Below is a basic diagram of a combi boiler within a heating system. A combi system Domestic hot water Combi Central heating flow Central heating return Mains cold water Identification Combination boilers will have 5 or more pipes emanating from the bottom of the boiler; o Heating flow (from boiler to radiators) o Heating return (radiators back to boiler) o Gas / oil supply o Mains cold water o Hot water supply (from boiler to taps) The boiler will fire when you turn the hot water tap on Lack of a hot water tank or cylinder Combination boilers tend to have fan-assisted flues © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 6 of 22 Examples Data Entry You should always record the heating system via the PCDF method if you can identify the make and model of the boiler. A photograph should be taken to prove this. If you cannot locate the boiler in the PCDF or the boiler has no make and/or model qualifier then you should use the SAP Table data entry method. Condensing Boilers These are more efficient/more modern versions of the two standard types of boiler. There are: Condensing combi boilers; and Condensing regular boilers They are identified by the presence of a white or grey plastic pipe that carries the liquid condensate from the boiler to a drain or soak away. © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 7 of 22 Examples Condensing combi with white pipe Condensate pipe on exterior of property Data Entry You should always record the heating system via the PCDF method if you can identify the make and model of the boiler. A photograph should be taken to prove this. If you cannot locate the boiler in the PCDF or the boiler has no make and/or model qualifier then you should use the SAP table data entry method. Back Boiler Another common type of heating system uses a back boiler for heat and water heat generation. Back boilers can be fuelled by many fuel types. They are normally located behind a fire – hence the name ‘back boiler.’ They are always standard boilers connected to a cylinder, or there will be a multipoint water heater elsewhere in the property. A clue to their location is that the programmer is normally located on the chimney breast, next to the fire which contains the back boiler. It is possible to install a modern condensing back boiler, but they are difficult to upgrade due to their location. Instead of upgrading the back boiler, the boiler is normally relocated and a standard or combi condensing boiler is installed. Therefore back boilers are becoming rarer as time goes on. The key to identification is locating the boiler itself. It is likely that that a boiler won’t be immediately found within the property, but there will be a gas fire with radiators present. The boiler will be hidden behind the fire making the exact make and model difficult to ascertain. Indeed, it becomes very difficult to take photographic evidence of the make and model as the identification panel is often difficult to access. © Stroma Certification Ltd Boiler Identification CPD Guide v1.1 Page 8 of 22 If it can be identified by a make and model identification plate/panel/label, then the DEA should enter the boiler via the PCDF method. In the likely event, the DEA should use the SAP table data entry method (known as the ‘Alternative Method’ in the RdSAP manual). Back boilers normally have an open flue but some can have a fan flue (more modern back boilers). Evidence will need to be provided to show the fan flue. Most back boilers are therefore entered as below. If a back boiler behind a fire has been identified, either via the PCDF or SAP table data entry method, it is essential that the fire itself is also entered as
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