Part numbers & buying
Where to Buy a Genuine Vaillant Cooling Plug
What to check before you buy — and where both part numbers are sold
The Vaillant cooling plug is a small part, but it matters that you get the genuine one. This guide covers what to check before you order — the part number, the packaging and condition, the seller’s record and compatibility — and where both part numbers, 0020266328 and 0020269259, are on sale.
Updated
Buy the Vaillant cooling plug on eBay
Same blue plug, two packs. Choose the boxed 0020269259, or get the identical 0020266328 for a fraction of the price.
Original Vaillant box, labelled “Coding plug, cooling function”
Buy on eBaySold by eBay seller boarder895 · 100% positive feedback · 600+ feedback · on eBay since 2003 · 20+ plugs sold
Check the part number
Either number is right: 0020269259, which Vaillant boxes and labels “Coding plug, cooling function”, or 0020266328, the same plug in a Vaillant small-parts bag. The listing should show which number you will receive, and its photos should show that label.
Check it is genuine and new
Look for Vaillant’s own packaging — the Vaillant name, the part number and a barcode on the label — and for photos of the actual item rather than a generic picture. The listing should say new and unused.
Check the seller
On eBay, look at the seller’s feedback score, positive percentage and how long they have been on eBay, and read feedback left for the same item. A seller who has sold the part many times will have feedback from buyers who fitted it.
Check it suits your heat pump
The plug is listed for the aroTHERM Plus range — VWL 35/6, 55/6, 75/6, 105/6 and 125/6. Some aroTHERM Split installations use it too. For any other model, especially a ground-source flexoTHERM or flexoCOMPACT, confirm with your installer manual or a Vaillant-approved installer first.
Where both part numbers are sold
Both are sold new on eBay by seller boarder895: 0020266328 in its Vaillant small-parts bag, and 0020269259 in its Vaillant box. The seller has 100% positive feedback and has been on eBay since 2003.
Buying on eBay means you pay through eBay’s checkout, see the postage and returns terms on the listing before you buy, and are covered by the eBay Money Back Guarantee if an item does not arrive or does not match its description.
A quick pre-purchase checklist.
| Check | What to look for | Why it matters |
|---|---|---|
| Part number | 0020269259 or 0020266328 | Both are the same cooling plug |
| Packaging | Vaillant label with part number and barcode | Shows it is a genuine Vaillant part |
| Condition | New and unused | A used plug may have been opened or damaged |
| Seller | Feedback score, percentage, years on eBay | Shows a track record with this part |
| Compatibility | aroTHERM Plus VWL 35/6 to 125/6 | Other models need checking first |
| Protection | eBay Money Back Guarantee | Covers non-arrival and items not as described |
Frequently asked questions
Is it safe to buy a Vaillant cooling plug on eBay?
Buying through eBay’s checkout gives you the eBay Money Back Guarantee if the item does not arrive or does not match the listing. Check the seller’s feedback and the photos of the actual part before you buy.
Can I buy direct from vheatc.site?
No. This website does not sell anything — both part numbers are sold on eBay by seller boarder895.
Which number should I buy?
Either. 0020269259 comes boxed and labelled for cooling; 0020266328 is the same plug in a Vaillant bag for a fraction of the price. Choose the boxed one if your paperwork names 0020269259.
Related guides
Ready to buy? Both plugs are on eBay
The plug inside is the same — choose the pack. 0020266328 is the best value; 0020269259 comes boxed and labelled “Coding plug, cooling function”.
Original Vaillant box, labelled “Coding plug, cooling function”
Buy on eBaySold by eBay seller boarder895 · 100% positive feedback · 600+ feedback · on eBay since 2003 · 20+ plugs sold
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