Vaillant Wiring Harness, Boiler Wiring Loom, Replacement Cable Assembly, Electrical Harness

Name: Vaillant Wiring Harness, Boiler Wiring Loom, Replacement Cable Assembly, Electrical Harness
Brand: BHL
SKU: W-501723
Price: 49.56 GBP
Availability: InStock

SKU W-501723

Manufacturer part number: 20210208
EAN: 4024074746868

£49.56

inc VAT£41.30 ex VAT

Lead time: 1-5 working days

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Phone: 01226 369637

Opening times

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Saturday and Sunday: closed

Delivery

Free standard delivery on orders over £100 ex VAT. Orders below this carry a £7.95 inc VAT delivery charge. Express delivery items £19.95 inc VAT, allow 1 to 2 working days. Delivery details and surcharges

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Description

Product Overview

The Vaillant wiring harness is a replacement wiring loom designed to connect key boiler components reliably and securely. Suitable for servicing and repair work, it helps restore correct electrical connections to keep your system operating as intended. Ideal for reducing downtime and ensuring a tidy, dependable fit during maintenance.

Key Features

Purpose-built replacement wiring loom – helps restore original wiring routes and connections for a dependable repair.
Designed for compatibility with Vaillant appliances – supports correct fitment where the specified part is required, reducing guesswork.
Improves connection reliability – helps prevent intermittent faults caused by damaged or worn wiring.
Cleaner, more professional installation – a complete harness can simplify servicing compared with patch repairs.

Use Case / Application

Commonly used in boiler repairs and servicing where existing wiring has become damaged, brittle, or faulty. Suitable for heating system maintenance in domestic and light commercial settings such as:

Utility rooms and airing cupboards
Kitchens with cupboard-housed boilers
Plant rooms in small commercial premises
Planned servicing, breakdown repairs, and component replacements

Problem to Solution

Ideal for resolving boiler electrical connection issues caused by worn or damaged cabling, providing a correct replacement harness for a safer, more reliable repair.

Product Specifications

• Manufacturer – Vaillant
• Manufacturer Part Number (MPN) – 20210208
• EAN / Barcode – 4024074746868
• Product Type – Wiring Harness

About the Manufacturer and Buying from BHL

Vaillant is a leading manufacturer of heating components and engineered boiler spares designed for dependable performance and long service life. This Vaillant wiring harness is the correct choice when you need a like-for-like replacement to help restore safe, stable electrical connections. Buy online today from BHL for competitive pricing, genuine parts, and free* and fast UK delivery. BHL is a specialist online merchant trusted by thousands of satisfied customers since 1998, with thousands of 5 star reviews, and orders delivered with care from UK warehouses. *see our terms

Reviews

Buying guide: Boiler Spares

Boiler spares are replacement parts for gas, LPG and oil boilers: printed circuit boards, fans, gas valves, pumps, diverter valves, heat exchangers, sensors, pressure gauges, burners, electrodes, seals, casing panels and flue parts. Most are made for one manufacturer, and often for a narrow range of models, so identifying the boiler correctly matters more than anything else.

Identify the boiler first

Find the data badge, usually behind the front panel or under the controls cover. It shows the manufacturer, the model and the GC (Gas Council) number, a seven-digit reference for the exact appliance. Natural gas and LPG versions of the same boiler usually have different GC numbers, and parts can change between production runs, so the GC number and serial number are the safest way to match a part. The boiler's installation and servicing manual lists the parts for each model.

Part numbers and replacements

Search by the manufacturer's part number where you have it. Manufacturers sometimes replace a part with a newer version under a new number; only use a replacement that the manufacturer lists for your model. Some repairs need a kit rather than a single part, for example a part supplied with new seals or fixings.

Safety

By law, work on gas boilers and their gas parts must be carried out by a Gas Safe registered engineer qualified for that type of appliance; ask to see their ID card before work starts. Oil boilers should be worked on by a suitably qualified technician.

For thermostats and programmers, see heating controls.

Shop all Boiler Spares