Hot-Water Heating Systems - Classification

Hot-water heating systems can be classified by temperature and pressure.

Hot-water systems can be classified by operating temperature into three groups

where

operates within a temperature of 250^oF (121^oC). The maximum allowable working pressure for a LTW system is usual 30 psi (2 bar).
LTW systems are in general used for space heating in homes, residential buildings, offices, local distribution of district heating systems and similar.

MTW systems operates at a temperature of 350^oF (177^oC) or less. The maximum allowable working pressure for a MTW system is usual 150 psi (10.5 bar)
MTW systems are often used in large hot-water distribution systems like district heating, and in systems where process applications requires higher temperatures than achievable by LTW systems

HTW systems operates at temperatures exceeding 350^oF (177^oC) or more. The maximum operating pressure for a HTW system is usual less than 300 psi (20.7 bar).
HTW systems are used like MTW systems in large distribution and process application systems.

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