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The combi boiler water flow regulator (flow limiter) is the part that keeps the flow rate constant in the domestic hot water line regardless of mains pressure. The blue elastomer ring inside the white plastic body narrows its own passage as the pressure increases; this way the water always passes through the plate heat exchanger at the same rate and reaches the set temperature.
This product is the 10 L/min step. The Beretta spare part code is R8009, with Beretta's own trade name Regolatore di flusso E10.
In the center of the disc you receive, you will see an embossed 05. This is not the flow rate value and does not mean that the wrong product was delivered. In this family, the color determines the flow rate:
| Flow rate | Elastomer color | Known OEM codes |
|---|---|---|
| 5 L/min | Yellow | — |
| 8 L/min | White | — |
| 9 L/min | Orange | — |
| 10 L/min | Light blue ← this product | Beretta R8009 · Worcester Bosch 87161410570 · Baxi 5116018 |
| 12 L/min | Red | Bosch/Worcester 87161410610 · Baxi 5620090 |
| 13 L/min | Olive green | Worcester 87161070450 |
| 14 L/min | Pink | — |
In other words, if it were 5 L/min the disc would be yellow; a blue disc means 10 L/min. The same verification can be made with three different manufacturers: Worcester Bosch sells this part as Type E-W Blue 10 Litres, and Beretta as E10.
🪤 The color code is consistent across brands at 10 and 12 L/min, but at lower steps (6–8 L/min) it may vary from manufacturer to manufacturer. Look at the color of your removed part; if the color matches, the step matches.
It is not a fixed-hole orifice — it is a dynamic regulator that adjusts itself according to pressure. As described by the manufacturer, it has three states:
Since the passage gets smaller as pressure increases, the flow rate remains constant. This is why the same boiler delivers water at the same temperature in an apartment with 2 bar mains pressure and in one with 6 bar.
In Beretta's official exploded diagram, this part is item 24 and is located between the fitting (item 23) and the domestic hot water flow switch (item 26). In other words, it is in the domestic water inlet line, just before the water enters the plate heat exchanger.
🪤 Do not confuse it with the flow switch / turbine. The turbine detects that water is flowing and sends a signal to the PCB — it is an electrical part. The regulator has no electrics and measures nothing; it only limits the flow rate mechanically. The two sit side by side on the same line and often fail together.
| Symptom | Probable condition |
|---|---|
| Water flows abundantly but lukewarm — never reaches temperature | The regulator has been removed, or the elastomer has hardened and stays open. Because the flow exceeds the design value, the water does not have time to heat up in the heat exchanger. |
| When the tap is opened the boiler does not ignite at all, flow is very weak | The regulator is blocked with limescale or sediment. Because the flow drops below the lower limit, the flow switch cannot detect that water is flowing. |
| Fluctuating temperature — hot one moment, cold the next | The elastomer is fatigued; heat exchanger scaling may also be involved. |
| Radiators heat up but no domestic hot water | The problem is not in the heating circuit; look in the domestic water line (regulator – switch – heat exchanger). |
The entire regulation relies on the elasticity of the rubber. Temperature, chemicals in the mains water and aging harden the elastomer; the ring can no longer change shape with pressure, and although the part looks intact, it cannot regulate the flow. In hard water areas, a limescale layer adds to this and permanently narrows the passage.
For this reason, visual inspection is misleading: as long as the disc is not torn, it looks intact. The decision is made based on the symptoms above and the age of the part.
Removing a regulator thought to be blocked increases the water flow, so at first it seems to solve the problem. However, when the flow is not limited, the water passes through the heat exchanger too quickly and never reaches the desired temperature — the difference becomes noticeable especially in winter when the mains water is cold. If the part is blocked, it is cleaned or replaced with a new one, not removed.
| Brand | Model | Code |
|---|---|---|
| Beretta | Boiler 28 BAI · Ciao J 24 CAI · Meteo Green 25 CSI AG | R8009 |
| Riello | Listed as the equivalent of Beretta R8009 | 4364531 |
Codes of other brands using the same 10 L/min step: Worcester Bosch 87161410570 (Type E-W Blue 10 Litres) · Baxi / Main / Potterton 5116018 (Flow Restrictor 10 L/min) · Worcester WA3123.
🪤 These codes indicate the same flow rate step; we do not claim that the seat size in these brands matches exactly. Before ordering for a non-Beretta appliance, measure the outer diameter and height of the removed part. If color + size match, the part will fit.
| Type | Dynamic (pressure-compensated) flow regulator — flow limiter |
| Flow rate | 10 L/min |
| Color code | Light blue elastomer, white body |
| Beretta code | R8009 (Regolatore di flusso E10) |
| Body marking | Embossed 05 on the elastomer disc — production mark, not the flow rate |
| Electrical connection | None — fully mechanical part |
| Mounting | Flanged — sits inside the domestic water inlet fitting |
| Manufacturer | Pakkens (Turkey) |
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