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Shop Ariston boiler flow units and hydraulic assemblies for selected combi boiler models. Depending on the boiler, the flow unit may work with the domestic hot-water flow switch, filters, valves and sensors. Before ordering an Ariston replacement flow unit, confirm the full boiler model, GC number and part number shown on the existing component.
The flow unit helps manage water movement through the boiler and allows the controls to detect hot-water demand. Ariston servicing manuals identify the domestic hot-water flow switch and hydraulic block as related assemblies within the boiler’s water circuit.
A faulty or blocked Ariston flow unit may cause intermittent hot water, no response when a tap opens, reduced water flow or internal leaking. Similar symptoms may also be caused by the flow switch, sensor, diverter valve, scale or debris.
Read our boiler working but no hot water guide for related causes.
Internal boiler components should be diagnosed by a Gas Safe engineer. Confirm the boiler model, GC number and existing part number before ordering.
