Viessmann Spare Parts
Electrical Deals Direct supplies genuine and compatible Viessmann spare parts for gas boilers, including ignition electrodes, safety valves, expansion vessels and plate heat exchangers. Order online with trade pricing, fast dispatch and expert phone support from a team who know boiler servicing and repair inside out.
About Viessmann Parts
Viessmann was founded in Germany in 1917 by Johann Viessmann and grew into one of the leading international manufacturers of heating technology, remaining a family-run business for over a century. Its heating division was acquired by Carrier Global in 2023 and now operates as Viessmann Climate Solutions, continuing to supply boilers and heating systems widely installed across the UK. Because these boilers rely on precise ignition, sealed combustion and pressure components to run safely and efficiently, worn electrodes, gaskets or valves are common causes of faults and lockouts, and need replacing with the correct part.
Looking for parts from other boiler brands? Browse our Vaillant Parts and Worcester Bosch Parts ranges, or all HVAC and heating parts.
Common Viessmann Parts We Stock
- Ignition & ionisation electrodes — electrode blocks and standalone ignition and ionising electrodes that light the burner and detect the flame
- Gaskets & seals — burner gaskets that keep the sealed combustion circuit airtight
- Safety valves — genuine safety valves protecting the boiler from excess pressure
- Air vents — domestic hot water (DHW) air vents for releasing trapped air from the system
- Expansion vessels — including the CRI 8 model, accommodating water expansion within the sealed heating system
- Plate heat exchangers — including replacement plate packs with O-rings, for transferring heat between the primary and domestic hot water circuits
- Servicing kits — bundled kits of the components typically replaced during a routine boiler service
How to Find the Right Viessmann Part
Viessmann parts are matched to the exact boiler model using the manufacturer's part number, so start by checking the model and serial number on your boiler's data plate, then cross-check the part number (for example 7828750 or 7837892) on the component you're replacing. We stock both genuine and compatible options on many parts, so you can choose on price and preference. If you're not sure which part you need, use our Can't Identify Your Spare Part? service, or send our trade counter team the model number or a photo of the old component and we'll match it for you.
Why Buy Viessmann Parts from Electrical Deals Direct
- Trade pricing on all Viessmann parts, with account pricing available for regular buyers
- Same-day dispatch on in-stock parts ordered before cut-off
- Genuine Viessmann parts, plus compatible options on selected items where they offer better value
- Expert phone support to match the right electrode, valve or vessel to your specific boiler
- Deep gas boiler servicing knowledge on hand, not just a parts list
Related Categories
Browse our Vaillant Parts, Worcester Bosch Parts, HVAC and Heating Parts, or all spares and accessories. Not sure what you need? Try our Product Advisor or browse the Advice Centre.
Viessmann Parts — Frequently Asked Questions
How do I know which Viessmann part I need?
Check your boiler's data plate for the exact model and serial number, then match the manufacturer's part number on the component you're replacing. If you're unsure, send us the details and we'll confirm the correct part.
Are these genuine or compatible Viessmann parts?
We stock a mix of both — genuine Viessmann components alongside compatible alternatives on selected items, so you can filter by part origin and choose based on price and preference.
What causes ignition faults on a Viessmann boiler?
A worn or fouled ignition and ionisation electrode is a common cause of ignition lockouts, as the electrode both lights the burner and confirms the flame is present. Replacing it with the correct part usually resolves the fault.
Should I replace a boiler safety valve or expansion vessel myself?
Gas boiler servicing and the replacement of pressure and safety components should be carried out by a Gas Safe registered engineer, as these parts directly affect the safe operation of the appliance.
What does a plate heat exchanger do?
In a combi boiler, the plate heat exchanger transfers heat from the primary heating circuit to the domestic hot water passing through, so your taps get hot water on demand. A failing exchanger is a common cause of reduced hot water flow or temperature.
Not sure exactly which part you need? Use our parts finder to search by model. If you'd rather talk it through, call our team on 01934 253600 or use live chat and we'll help you get the right Viessmann spare first time.
From Splash Backs to Drip Plates to Air Filters, if it's not in the list, don't hesitate to call us on 01934 253600, or send an email over to [email protected]. We are confident that we can source your replacement part or accessory.
