Where is an expansion tank typically located in a hot water system?

An expansion tank is typically located at the top of the system in a hot water heating setup to accommodate the thermal expansion of water as it heats up. As water is heated, it expands and creates increased pressure within the system. The expansion tank allows for this increase in volume by providing space for the expanded water, preventing excessive pressure that could lead to system failure or leaks.

Positioning the expansion tank at the top helps it to effectively manage the pressure changes that occur during the heating cycle. Gravity assists in maintaining the water level and ensures that the tank operates efficiently. By being at the highest point, it also minimizes the risks of air becoming trapped in the system, which could hinder the proper operation of the heating system.

Placing the expansion tank near the boiler could result in ineffective pressure management if the hot water does not reach the tank efficiently. Similarly, positioning it at the bottom or in the middle of the heating loop would undermine its primary function of handling expansion effectively. Thus, situating the expansion tank at the top is critical for optimal performance and reliability in a hot water system.