HTHW systems operate above what temperature and pressure?

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Multiple Choice

HTHW systems operate above what temperature and pressure?

Explanation:
High-temperature, high-pressure water systems are defined by using liquid water at temperatures above 250°F and pressures above 160 psi. At these conditions the water stays in the liquid state while carrying heat, which makes it an efficient heat-transfer medium without turning into steam. The elevated pressure prevents boiling as the temperature climbs, enabling higher heat delivery within a compact system. The threshold of 250°F and 160 psi is the convention used to distinguish HTHW from regular hot-water or steam systems, which operate at lower temperatures and/or pressures.

High-temperature, high-pressure water systems are defined by using liquid water at temperatures above 250°F and pressures above 160 psi. At these conditions the water stays in the liquid state while carrying heat, which makes it an efficient heat-transfer medium without turning into steam. The elevated pressure prevents boiling as the temperature climbs, enabling higher heat delivery within a compact system. The threshold of 250°F and 160 psi is the convention used to distinguish HTHW from regular hot-water or steam systems, which operate at lower temperatures and/or pressures.

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