Overhead

Charges of a fairly fixed nature which do not vary with the volume of activity. Light water rent and some taxes are overhead items.
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Fixed charges which do not vary proportionately with the amount of business done.

Overhead and profit

Costs involved in doing business such as office staff, rent, supplies, equipment job-related overhead is building permits, fees, inspections, utility hook-up charges, blueprints, surveys, and other such tasks. Profit is positive return on investment. Overhead and profit become an issue in replacement cost settlement of property losses.

Overheating

Excessive heating. If a boiler or self-fired pressure vessel accidentally suffers a general deficiency of water while working, severe damage may be caused to the boiler shell, firebox, etc. The risk is insurable as a whole or, in the case of a multi-tubular boiler, limited if desired to the overheating of the tubes only. The cover is for ‘self damage’ only and is put into effect as an extension of the boiler and pressure plant policy.