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Vaillant connection 3/8
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Vaillant connection 3/8 0020266457

€ 25.74 incl. VAT

Original spare part Vaillant. Type: Connection. Application: Heat pump / uniTOWER Split VWL 128/5 IS. Delivery time: approx. 7–10 days. Supplier code: 0020266457.

Special-order item — delivery time approx. 7–10 days — non-returnable

SKU: 80500910 Categories: , Brand:

Price and stock checked on 20 October 2026.

Made-to-order item — ordered specially for you, see delivery time below
EU delivery from € 17.95 · Shipping & payment

Price incl. VAT. Any delivery costs are calculated in the basket — see shipping & delivery.

Does this fit my appliance?
ApplicationHeat pump
Series / modeluniTOWER Split VWL 78/5 IS and 1 other model
Vaillant number0020266457
Article number80500910
Not sure? Search by article or manufacturer number or check with the manufacturer or your installer.
All spare parts for Vaillant uniTOWER Split VWL 78/5 IS →
Made-to-order item — this spare part is not on our shelf and is ordered specially for you from the manufacturer or wholesaler, delivery time approx. 7–10 days. Specially ordered items cannot be returned: the manufacturer or supplier does not take them back. So check the type number of your appliance and the article number of the spare part beforehand. In doubt? Check with the manufacturer or your installer (see also returns).
9,0/10 WebwinkelKeur⚠ Made-to-order item: no returns possible iDEAL · Klarna · Bancontact 085-303 7272 ma–vr 08:00–17:00

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Vaillant connection 3/8: original Vaillant spare part, type: Connection. Application: Heat pump (uniTOWER Split VWL 128/5 IS). Manufacturer number: 0020266457; Instalpunt article number: 80500910.

According to the Vaillant parts lists, this part fits 2 models, including Vaillant uniTOWER Split VWL 78/5 IS and Vaillant uniTOWER Split VWL 128/5 IS. The full list is under “Fits”.

Special-order item (delivery time approx. 7–10 days): it is ordered specially for you from the manufacturer and is non-returnable.

Check the rating plate of your appliance before ordering; if in doubt, ask the manufacturer or your installer.

Product information: Vaillant connection 3/8 0020266457

BrandVaillant spare parts
Vaillant manufacturer number0020266457
Instalpunt article number80500910
EAN4024074838112
Part typeConnection
ApplicationHeat pump
Suitable for2 Vaillant models (see list)
DeliverySpecial-order item, delivery time approx. 7–10 days
Price€ 25,74 incl. VAT
OriginSupplied through the official technical wholesale channel, under Vaillant number 0020266457

Fits 2 Vaillant models

The part Vaillant connection 3/8 0020266457 is in the official parts list of these Vaillant appliances. Click a model for the complete parts list and exploded view.

Vaillant Heat pump (2)

Check the rating plate of your appliance. Not sure whether this part fits? Check with the manufacturer or your installer; with the correct manufacturer number you can order it here directly.

Position on the parts diagram

This spare part is shown as position 12 on the parts drawing. Open the drawing for the appliance and click the number to check that you have the right spare part.

Frequently asked questions about this item

Does the Vaillant connection 3/8 0020266457 fit my appliance?
This part is in the parts list of 2 Vaillant models, namely the uniTOWER Split VWL 78/5 IS, uniTOWER Split VWL 128/5 IS. The model type is on the rating plate of your appliance. If in doubt, ask the manufacturer or your installer.
What is the delivery time of this made-to-order item?
This is a special-order item: we order it specially for you from the wholesaler. The expected delivery time is approx. 7–10 days. You can also see the delivery time next to the stock status at the top of this page.
Can I return this made-to-order item?
A specially ordered item is not taken back by the supplier, so returns are not possible. So check the article number and the rating plate of your appliance beforehand. Is something wrong with your order? Then contact us via info@instalpunt.nl. The full terms and conditions are on returns.
What does shipping cost?
Shipping costs € 17.95 to Austria, Denmark, Italy, Spain and Sweden and € 24.95 to other EU countries. In-stock items ordered before 2 pm are dispatched the same working day; delivery usually takes 3–5 working days. Details: Shipping.
I have a fault code, which part do I need?
Look up the code in the fault code finder: per brand and appliance it shows what the code means and which part goes with it. If the code is listed with this part, the part belongs to that fault.

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