How high must open-type expansion tanks be located above the highest heating element?

The correct requirement for the height of open-type expansion tanks is that they must be located at least 4 feet above the highest heating element. This specification is important for several reasons.

An open-type expansion tank serves as a crucial component in a hot water heating system, allowing for the expansion of water as it heats up. By positioning the tank at least 4 feet higher than the highest heating element, it ensures proper operation by maintaining the necessary pressure and preventing the potential for air pockets in the system. This height also helps to prevent any backflow of water from the heating system into the expansion tank, allowing for optimal performance and safety in the heating system.

Furthermore, this height requirement is based on industry standards and building codes, which are established to ensure the safe and effective operation of heating systems. Failing to comply with this height requirement could result in malfunctions and safety hazards.

All of these factors underline why a minimum height of 4 feet is specified for open-type expansion tanks above the highest heating element.