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Field testing of boiler economy devices

A number of commercially promoted boiler economy devices have been tested for their effect on the operation of a twin boiler system in a working primary school. Both boiler efficiency and site gas usage were measured. It was found that most of the devices had no effect on either aspect of performance. The only device to produce measurable reductions in gas usage and an increase in boiler efficiency appeared to achieve this by effecting unacceptable reductions in average boiler temperature.