Ideal Restrictor Plate 420kW 178147

The Ideal 178147 is a restrictor plate rated at 420kW, produced by Ideal for use in its commercial heating appliances. It forms part of the casing and flue-side assembly, where it controls the passage of flue gases so that draught and combustion remain balanced across the heat exchanger. The plate is matched to the output of the appliance it serves, which is why the 420kW rating matters when identifying a replacement.

• Combustion readings that drift away from the values recorded at commissioning
• An unstable flame, lifting off the burner or burning with a yellow tint
• Sooting or discolouration around the flue outlet or heat exchanger
• Repeated high-limit trips or unexplained overheating on the appliance
• A plate that is distorted, corroded, cracked or missing when the casing is opened

• Confirm the appliance model and GC number from the data badge before ordering, as the plate is output-specific.
• Check that the existing restrictor plate carries the same 420kW rating as the replacement.
• Inspect any gaskets and seals disturbed during removal and renew them if they are compressed or damaged.
• Compare the part number on the old component with 178147 to be sure the correct item is being replaced.