Where should shut-off valves be installed on a boiler?

Shut-off valves should be installed on both the supply and return sides of a boiler to ensure safe and efficient operation. This configuration allows for complete isolation of the boiler for maintenance or repair purposes without disrupting the entire heating system. By having valves on both sides, technicians can perform service work, such as replacing the boiler or servicing components, while minimizing the need to drain the entire system.

Shut-off valves also play a crucial role in system maintenance, allowing for localized control of water flow. In the event of a leak or malfunction, shutting the valve on either the supply or return side can prevent water loss and system downtime, which is critical for maintaining comfortable indoor temperatures and ensuring system longevity.

The installation of shut-off valves solely on the supply side or return side limits accessibility and can lead to complications during maintenance. Placing valves only on the discharge side does not provide the necessary controls for the entire system. Therefore, the installation of shut-off valves on both the supply and return sides not only promotes efficient operation but also enhances safety and serviceability of the boiler system.