Building Regulations Part L to Help Reduce Carbon Emissions
Part L was introduced as part of the 2005 Building Regulations and it set a new standard with regards to energy efficiency. It called for all new boilers installed or replaced to meet the required standards for achieving high efficiency rating. Boilers such as condensing and combination (also known as ‘combi’) boilers which use extra large heat exchanger or a secondary heat exchanger qualify for this requirement. By extracting the heat from previously expelled gases, the high efficiency boilers reduce the required fuel to generate the same about of heat.
The new requirements are much more demanding than previously in terms of the professional level of the system designer, the installer and the service engineer. The new systems are more integrated than old systems as all components are specifically designed to provide the right output (in terms of power) or demand the right input (such as in the case of heating controls). The engineer has to have good understanding in order to maximize the efficiency of the system.
Industry research calculated that since the introduction of part L of the building regulations, the savings of carbon emissions made by the UK domestic heating market have been substantial. Recently conducted research puts the amount of carbon emission reduction at around 2.4 million tonnes. The researchers further calculated that if the industry did not apply the new Part L requirements, and continued installing SEDBUK D rated boilers, the carbon emissions from domestic heating would have grown by over one million tonnes since 2005.
At present there is still plenty of room for improvement in terms of the amount of carbon generated and emitted by domestic heating in the UK. There are around four million old boilers still installed around the country which have significantly lower efficiency compared to modern A rated boilers. Installing a modern A rated boiler as a replacement, would reduce their respective carbon emissions by around 30%. A typical home in the UK generates around 5 tonnes of carbon dioxide emissions every year. Overall carbon emitted from domestic heating sources is responsible for around 16% of the total UK national CO2 emissions.
The government is trying to encourage carbon reducing behaviour within the home heating sector. It has scrapped stamp duty for carbon neutral homes and has introduced the home information packs which have an energy performance certificate as part of the pack. However, the stamp duty benefit does not apply to the vast majority of inefficient homes around the country making it less effective. The home information packs (with their energy performance certificate component) also have drawbacks in that they are only produced when the house is sold, and thus not having enough of an impact at other times to encourage reduction in carbon emissions.
There are several alternatives to adopt that can further reduce the carbon emission resulting from domestic heating within the UK. The most effective among them is the application of renewable energy technologies, such as solar water heating. If just 10% of the new homes that the government plans to build between now and 2020 adopt such technologies, it is estimated that around 150,000 tonnes of carbon emissions would be cut on an annual basis.
There are several options for the government to reduce the carbon emissions from the UK housing stock and meet the challenging targets it set. It is important to note that any relevant plan would be met with a prepared and professional group of plumbing and heating companies that are investing in professional development and staff training for the new technologies.
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