Part L of the Building Regulations Harnesses High Efficiency Boil
Introduced in 2005 the new Building Regulations Part L has changed the scene as far as boilers are concerned. According to the new requirement, all boilers replaced or installed must be of high efficiency rating. This includes condensing and combination boilers which utilize a larger heat exchanger (or a secondary heat exchanger) to recoup some of the heat that would normally be released into the atmosphere with the exhaust gases. Since some of the energy can be reused, the boiler can generate the same amount of heat with less fuel.
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.
Since Part L of the building regulation was introduced, domestic heating in the UK has seen a remarkable drop in the volume of carbon emissions that is generated annually. According to analysis conducted by the heating industry, a reduction of around 2.4 million tonnes of carbon was made since the new regulations were introduced. As a reference point, the analysis shows that if the industry did not adopt Part L and kept on relying on SEDBUK D rated boilers, the carbon emissions level would have increased by over one million tonnes since 2005.
As things stand, there are massive opportunities to reduce the carbon emissions levels resulting from domestic heating in the UK. It is estimated that there are around four million old and inefficient boilers still in operation around the country. Replacing these boilers with a high efficiency A rated boiler would reduce the carbon emissions by around 30% per boiler. A typical UK household generates around 5 tonnes of CO2 annually. It is estimated that UK home heating accounts for approximately 16% of the total carbon dioxide emission for the UK as a whole.
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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