School Comparison Tool

This tool allows you to compare the energy performance of a number of schools within a Local Authority group or across the whole of Energy Sparks. The aim is to allow you to identify the best and worst performing schools to provide examples of best practice and to identify the schools needing the most support to improve their energy management.

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Hot Water Efficiency

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Hot water in schools is generally provided by a central gas boiler which then continuously circulates the hot water in a loop around the school. Sometimes these gas-based systems are supplemented by more local electrically powered immersion or point of use heaters.

The circulatory gas-based systems in schools are generally very inefficient. These inefficiencies offer significant cost and carbon emission saving opportunities if addressed.

These systems are inefficient because they circulate hot water permanently in a loop around the school so hot water is immediately available when someone turns on a tap rather than having to wait for the hot water to come all the way from the boiler room. The circulatory pipework used to do this is often poorly insulated and loses heat. Often these types of systems are only 15% efficient compared with direct point of use water heaters which can be over 90% efficient. Replacing the pipework insulation is generally not a cost-efficient investment.

Drilling down to an individual school's hot water analysis provides more detailed information on how a school can reduce its hot water costs.

The charts and table below analyse the efficiency of schools' hot water systems and the potential savings from either improving the timing control of existing hot water systems or replacing it completely with point of use electric hot water systems.

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