Energy Saving Case Study 14
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House Age: Modern (1970 - Now)
Energy Saving Improvement 1
Description: Glowworm 30cxi gas condensing combination boiler installed in hall cupboard with vertical flue
Cost: £0 (value £2,000 in 2013)
Energy Saving Improvement 2
Energy Saving Improvements Details
This is a 2 bedroom detached bungalow originally thought to have been built on the site of 1940s “Prefabs”. In 1987 the council owned property was rebuilt with a factory manufactured construction system, an external brick skin and double glazing. The home has a pitched roof and is located near the heart of a small village and has a mains gas supply.
It its original condition the house would have scored SAP55 in EPC band D and is estimated to have required 320kWh/m2 of gas for heating and hot water, producing 3.7 tonnes CO2.and costing £733 per year.
The loft insulation was increased recently so that it now reaches 300mm thickness and this would have resulted in a reduction in the heating load of 6% and saving 0.2 tonnes CO2.
A new condensing combination boiler was installed to replace the previous one which was over 20 years old. This achieved a further energy reduction, bringing the total saving up to 30% based on the EPC assessment.
Finally, the property was included in a pilot scheme run by the County Council and was amongst a number of homes fitted with external wall insulation. Cavity wall insulation was not considered possible with the type of construction and so external wall insulation was suggested. This reduced the energy requirement to 186kWh/m2 and carbon emissions to 2.2tCO2.
This indicates that even a fairly modern building can achieve significant savings with a few improvement measures. The bungalow now achieves an energy efficiency rating of SAP71 with a combined heating and hot water energy cost estimated to be no more than £250 each year. The annual environmental impact of the property has reduced by 41% from 3.7 to 2.2 tonnes CO2.