At what pressure is a low pressure hot water boiler considered low pressure?

A low pressure hot water boiler is defined as one that operates at pressures typically below 160 psig. The distinction between low pressure and high pressure in boiler systems is crucial for understanding operational standards and safety regulations.

In the context of New York regulations and general industry practice, low pressure hot water boilers generally operate at pressures of 15 psig or less, though systems can be designed to operate up to 160 psig and still be classified as low pressure. As a result, pressures above 160 psig would classify a boiler as high pressure, subjecting it to more stringent inspection and operational requirements.

Therefore, the correct choice aligns with this regulatory standard, as it indicates the upper limit that still maintains the classification of low pressure. Understanding these limits helps ensure compliance with safety standards and regulations in boiler operation.