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71-97406 Controls for Oil-Fired Heating - Honeywell
customer.honeywell.comlighter grades of fuel have lower Btu content than heavier grades. The chart below lists differences in Btu content of the various grades of fuel oil. Table 1. Btu Content per Oil Grade. Viscosity is determined by measuring the amount of time required for a sample of oil to flow naturally through a capillary restriction.