You can still read the number on the old part, but the shop lists several items with similar names. What matters now is whether the complete manufacturer part number, the heating appliance it is intended for and the package contents all match. These details let you search precisely without relying on a similar-looking product photo.
Start by separating appliance details from part details
Note the manufacturer and the complete appliance model from the rating plate. Add the serial number if one is shown. Separately, record the number of the spare part you need. The appliance model and part number serve different purposes: one identifies the equipment, the other identifies the item you are looking for.
Include every leading zero, letter and suffix. If you cannot read a character clearly in a photo, resolve that uncertainty before ordering. An incomplete search term may return a result, but that alone does not establish a match.
Three examples from the range
| Component | Manufacturer part number | Sales unit stated in the shop |
|---|---|---|
| Vaillant ignition electrode including cable | 0020068041 | 3-pack |
| Bosch electrode set | 87181070870 | 3-pack |
| Wolf ignition and flame-sensing electrode | 8601902 | 3-pack |
The Vaillant ignition electrode 0020068041 is explicitly described as including a cable. The Bosch electrode set has manufacturer part number 87181070870. For Wolf, number 8601902 identifies the ignition and flame-sensing electrode. These examples show which details to compare. They do not establish which component fits your heating appliance.
A short checklist before adding to your basket
- Record the appliance: Gather the manufacturer, complete model designation and available rating-plate details.
- Identify the spare part: Have the required part number checked against the spare parts list or the relevant appliance documentation.
- Read the product description: Check the name and complete number on the product page. A reference to a product series does not replace checking the specific appliance version.
- Check what is included: Distinguish between an individual part, a set and the sales unit. Each of the offers above is listed as a 3-pack.
- Resolve discrepancies: A different number or a missing suffix needs to be clarified before ordering. If you think a part has been superseded, you need a traceable manufacturer reference confirming the replacement.
What to include in a focused enquiry
If the match is unclear, email the complete appliance model, the part number you have read and a link to the item you want. Clear photos of the markings can support your enquiry. Checking appliance compatibility remains essential; a picture alone cannot replace that check.
At HKS Energy, we recommend confirming the correct part first and then deciding on the quantity required. Fault diagnosis and installation are tasks for the qualified contractor carrying out the work. This guide helps you prepare your order.
If you are looking for a separate circulator, you will find the relevant selection criteria in our guide Choosing a heating pump: installation length, head and control.
Product details for reference
- Vaillant ignition electrode 0020068041 including cable – 3-pack
- Bosch 3-pack electrode set – 87181070870 – ZSB/ZWB/ZWSB/ZBS/CSW
- Wolf ignition and flame-sensing electrode 8601902 – 3-pack
Source: HKS Energy product information, as of 1 October 2026.