A hot water blower coil is a type of heating system that uses hot water to generate warm air. It is a type of forced-air heating system that utilizes a hot water-filled coil to heat air as it passes through the coil. The hot water is circulated through the coil by a pump, and the air is forced through the coil by a fan. The hot water is heated by a boiler, typically powered by natural gas, propane, or electricity. The hot water is then circulated through the coil, which warms the air as it passes through. The heated air is then delivered to the space to be heated. Hot water blower coils are an efficient and cost-effective way to heat a space, and are often used in residential and commercial applications. They are also a great option for heating larger spaces, as they can provide a steady and consistent temperature throughout the space.