Skip to content
Contact Us Privacy & Policy Return & Refund Policy Shipping Policy Terms & Services FAQ
Free Shipping in Selected Areas | Quality You Can Trust | Secure Checkout
Free Shipping in Selected Areas | Quality You Can Trust | Secure Checkout
WhatsApp
Vaillant 80/125mm Concentric Flue Extension 1.0m – 303203 - Getplumb
Vaillant 2m PP Flue Extension – DN80/125 | 303205 - Getplumb
Vaillant 80/125mm Concentric Flue Extension 1.0m – 303203 - Getplumb
Vaillant 2m PP Flue Extension – DN80/125 | 303205 - Getplumb

Vaillant 125mm Air/Flue Extension (1970mm) 303205

Product Logo
by Vaillant
SKU V-303205
Save 20% Save 20%
£182.95
£182.95 - £182.95
£182.95
£146.36
£146.36 - £146.36
£146.36

Free Local Shipping

Free Local Shipping on orders over £100. Standard delivery to most UK postcodes within 1-2 working days. Express options available at checkout for more information, see here

Contact Us

Give Us A Call +44 118 958 8882 Our team is here to help. We will provide expert advice on specifications, compatibility, and delivery options.

30-day Easy Return

30 days Easy Return — no questions asked. If you're not completely satisfied, send it back within 14 days for a full refund.

The Vaillant 125mm Air/Flue Extension 1970mm (303205) is a flue system extension designed to increase the length of a compatible Vaillant flue installation. With a stated length of 1970mm and a 125mm diameter, it provides additional reach where a longer flue configuration is required.

Suitable for use with the Vaillant ecoTEC boiler range, this white flue extension is identified by manufacturer part number 303205. Check the exact boiler model and flue arrangement before ordering to confirm compatibility.

1970mm Length 125mm Diameter White Finish 1-Year Warranty

Key Features

1. Extended Flue Reach

The 1970mm extension allows a compatible Vaillant flue system to be extended where additional length is required.

2. Designed for Vaillant ecoTEC Boilers

Specified for use with the Vaillant ecoTEC boiler range. Confirm compatibility with the exact appliance and existing flue components before installation.

3. 125mm Diameter

The extension has a stated diameter of 125mm. Check the diameter and configuration required by your boiler's flue system.

4. White Finish

The white finish provides a consistent appearance when used with a compatible flue installation.

5. Identifiable Manufacturer Part Number

Manufacturer part number 303205 helps identify the correct component when ordering or sourcing replacement flue accessories.

6. Manufacturer-Stated Warranty

The product specification lists a 1-year warranty. Refer to the applicable warranty terms for coverage details.

Technical Specifications

Brand Vaillant
Product Name 125mm Air/Flue Extension
Product Type Flue Component
Sub Type Flue Extension
Length 1970mm
Diameter 125mm
Colour White
Compatible Boiler Range Vaillant ecoTEC range (verify exact model)
Warranty 1 year
Manufacturer Part Number (MPN) 303205
Product Code 100480
EAN 4024074343401

Applications and Compatibility

This extension is intended to extend a compatible Vaillant air/flue system for an ecoTEC boiler installation. Before purchase, confirm the required flue diameter, system type and appliance compatibility against the manufacturer's installation documentation.

Flue components must be installed in accordance with Vaillant instructions and applicable UK regulations by a suitably qualified heating professional.

Frequently Asked Questions

What is the length of the Vaillant 303205 flue extension?

The supplied product specifications state a length of 1970mm.

Which boilers is this extension suitable for?

The supplied information lists the Vaillant ecoTEC boiler range. Check the exact boiler model and flue configuration before ordering.

What is the diameter of this extension?

The stated diameter is 125mm.

What is the warranty period?

The supplied specification lists a 1-year warranty.

What is the part number for this product?

The Vaillant manufacturer part number is 303205, and the listed EAN is 4024074343401.

Order the Vaillant 125mm Air/Flue Extension

Order the Vaillant 1970mm Air/Flue Extension (303205) from GetPlumb for your compatible ecoTEC flue installation. Check the appliance requirements and part number before placing your order.

At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.

🆓 Free Local Delivery (Orders £100 & above)

We offer FREE delivery on orders £100 or more
for selected local areas.

Eligible Postcodes Include:

  • RG*
  • SL*
  • OX10*, OX11*, OX49*
  • HP1*, HP3*, HP8*, HP9*, HP10*, HP11*, HP12*, HP13*, HP14*
  • WD*, HA*, UB*, TW*, KT*
  • W1* – W9*
  • NW*, SW*

Delivery Time: 2–4 working days

Shipping Cost: £0.00

📦 Standard Shipping (Weight-Based Rates)

For orders that do not qualify for free delivery, standard
shipping rates apply based on total cart weight.

  • For cart weight between 0–2 kg, the shipping cost is £4.50 with a delivery time of 2–4 working days.
  • For cart weight between 2–24 kg, the shipping cost is £9.99 with a delivery time of 2–4 working days.
  • For cart weight between 24 kg and above, the shipping cost is £60 with a delivery time of 2–4 working days.

🧱 Block Salt (Harvey’s) – Unit-Based Shipping

This rate applies only to Harvey’s block salt products.

  • £7.99 is charged for every 3 items.
  • The charge increases by £7.99 for each additional set of 3 items.

Examples:

  • 1–3 items → £7.99
  • 4–6 items → £15.98
  • 7–9 items → £23.97

Delivery Time: 2–4 working days

📏 Large / Long Items (Length-Based Shipping)

For oversized items where the product length is 1.5 metres or more:

Conditions:

  • Product length ≥ 1.5 m
  • Cart weight ≤ 40 kg

Shipping Cost: £18.00 (flat rate)

Delivery Time: 2–4 working days

Collection from Store

Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge. For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare