Worcester Bosch Filling Loop Valve 8716118463

The Worcester Bosch filling loop and drain valve, part 8716118463, is a combined isolation valve assembly used on Worcester Bosch central heating boilers. It allows water to be introduced manually into the sealed heating circuit when the system pressure has dropped below the level the boiler needs to operate. The drain side of the assembly provides a single point for emptying the system during service or repair work.

• System pressure falls repeatedly and cannot be held at the correct level after topping up.
• Water weeps or drips from the filling loop body, the valve spindle or the drain outlet.
• The valve handle turns without resistance or will not shut off fully, so the loop cannot be isolated.
• Scale or corrosion around the connection points, often seen as white or green deposits.
• The drain outlet fails to seal after the system has been emptied.

• Check the GC number and model on the boiler data badge against the compatibility list, as several Greenstar Highflow variants use different assemblies.
• Confirm the part number on the existing valve matches 8716118463 or the alternative number 1020165 before ordering.
• Inspect the sealing washers and connections on removal; a replacement seal may be needed to complete the job.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.