The application of heat to raise the temperature of the environment, ambient or local, or the systems for accomplishing this effect. It is distinguished from HEAT, the physical property and principle of physics.
    

concept

The labelled interior of a boiler room at a military hospital in St. Petersburg. Lithograph.

Two surgeons treating two seated male patients in a surgery, many surgeons' dishes are hanging from the ceiling. Line engraving by W. Kilian, 1652, after C. Ortz.

A receptacle for burning coal to heat cautery instruments. Engraving.

Specification of Joseph Bramah : steam engines and boilers.

District heating in American housing : the report of a mission to the United States of America February - April 1947.

Healthy houses : a handbook to the history, defects and remedies of drainage, ventilation, warming and kindred subjects, with estimates for the best systems in use and upwards of 300 illustrations / by William Eassie.

Explanation of a new method for warming and purifying the air in private houses and public buildings : for totally destroying smoke, for purifying the air in stables, and every kind of buildings [sic] in which animals are lodged.

Specification of William Clerk : stoves and fire-places for dwellings, &c.

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Specification of Joseph Bramah : steam engines and boilers.

District heating in American housing : the report of a mission to the United States of America February - April 1947.

Healthy houses : a handbook to the history, defects and remedies of drainage, ventilation, warming and kindred subjects, with estimates for the best systems in use and upwards of 300 illustrations / by William Eassie.

Explanation of a new method for warming and purifying the air in private houses and public buildings : for totally destroying smoke, for purifying the air in stables, and every kind of buildings [sic] in which animals are lodged.

Specification of William Clerk : stoves and fire-places for dwellings, &c.