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Methods for assessing thermal performance of boilers for steam, hot water and high temperature heat transfer fluids - Concise procedure Ingestion-build-48974 Ensuring the quality of your1 Scope This Part of BS 845 describes a concise procedure for conducting thermal performance assessments, using the indirect (losses) procedure, to give results within a tolerance of 2 percentage points1) for boilers for steam, hot water or high temperature heat transfer fluids and for presenting the results in tabular form. Test results are based on either the gross or the net calorific value of the fuel. This concise procedure provides a convenient