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Exterior Tube

Part number (MPN)
3003856
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OEM Replacement Part & Compatibility Table

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Source
retailer parts list
checked 2026-11-06
Fitting notes

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

Compatible appliances

Always check the model and serial number on the data plate before ordering.

Frequently asked questions

Which appliances does 3003856 fit?

The sources we checked list 3003856 (Exterior Tube, Riello) for: RS 50/M MZ TL3/230-400/50 OIL, Riello Rs28/1 818T1 3782016, Riello Rs38 810T1 3784318. Always check the model and serial number on the data plate before ordering.

Does 3003856 have equivalent or superseded part numbers?

The sources we checked list no equivalents for 3003856. Ask a Riello stockist to confirm.

What should I check before fitting 3003856?

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

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Some lists are dated and the part may have been superseded. Information only, compatibility not guaranteed.