Worcester Bosch Flow Regulator 13 Ltr Olive Green 87161070450

The Worcester Bosch 87161070450 is a flow regulator, also listed as a flow restrictor, rated at 13 litres and finished in olive green. It sits in the hydraulic section of the boiler and controls the rate at which water passes through the domestic hot water circuit, holding flow within the appliance's design range so the boiler can modulate and maintain a stable outlet temperature. It is a Worcester Bosch component used across Greenstar and British Gas Greenstar combi models.

• Domestic hot water runs hotter or colder than the setpoint, or the temperature swings when another tap is opened.
• Flow rate at the hot tap sits above the appliance's rated range, so the boiler cannot modulate to hold temperature.
• Scale or debris build-up inside the regulator restricts flow and reduces hot water output.
• Water weeping from the regulator body or from its connections.
• Repeated temperature-related lockouts or overheat faults on the domestic hot water side.

• Check the GC number and the appliance serial plate to confirm the model before ordering.
• The alternative number 1021034 may appear on older documentation for this component.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.