The ideal location to install an expansion tank is indeed near the hot water source, with the tank positioned hanging downwards. This configuration allows the expansion tank to effectively accommodate the thermal expansion of water as it heats up. The downward orientation helps in facilitating the flow of water into the tank and allows for better pressure management within the system.
Positioning the expansion tank close to the hot water source ensures that it can respond quickly to the changes in pressure caused by the heating water, protecting the plumbing system from excessive pressure buildup. This is crucial in preventing potential damage to pipes, fittings, and appliances connected to the water supply.
Hanging the tank downward is beneficial because it utilizes gravity to help manage the water flow and expansion, ensuring that the system operates efficiently. Additionally, this setup maintains proper water levels in the tank, allowing for optimal functioning.
In contrast, placing the expansion tank under the sink might lead to accessibility issues for maintenance, and it may not effectively handle the pressure changes. An upward installation could impede water flow and might not perform as intended. Similarly, situating the expansion tank in the attic is generally not advisable due to the potential for freezing conditions and difficult access for maintenance.