Worcester Bosch Flow Regulator 15 L/min 4 GPM 87161058690

The Worcester Bosch 87161058690 is a flow regulator rated at 15 litres per minute (4 GPM). It sits in the domestic hot water circuit of the appliance and controls the rate at which water passes through the boiler, holding the flow steady so the heat exchanger can match output to demand. It is used across the Worcester Greenstar combi and classic families, including British Gas badged variants of the same appliances.

• Domestic hot water flow at the tap is noticeably lower than it used to be, or drops away as the boiler modulates.
• Flow rate at the outlet is erratic, rising and falling while a tap or shower runs at a steady setting.
• Hot water temperature swings between hot and lukewarm because the boiler cannot hold a stable flow through the secondary heat exchanger.
• The regulator body or its seating shows scale build-up, debris or visible damage once the assembly is opened.
• The appliance reaches its temperature limit and cycles on and off during a draw-off that should be continuous.

• Check the GC number and appliance serial plate against the compatibility list before ordering, as the same boiler family can use different flow regulators across build revisions.
• Confirm the alternative number 1014757 against the part you are removing, particularly where an earlier regulator has already been changed.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.