Viessmann 7828646 Expansion Vessel CRI 8 | Replacement Spare Part
- SKU
- EDDVIESSMANNSPARE10
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The Viessmann 7828646 Expansion Vessel CRI 8 is a genuine replacement part designed for compatible Viessmann Vitodens boiler systems. Its main function is to absorb excess pressure created when water heats and expands within a sealed heating system, preventing damage to internal components and maintaining safe operating conditions.
Inside the vessel, a pre-charged air bladder compresses as system pressure rises, helping to stabilise fluctuations and reduce strain on the boiler’s pump, seals, and pipework. Over time, expansion vessels can lose pressure or fail internally, leading to symptoms such as pressure drops, frequent topping up, or boiler fault codes. Replacing a faulty unit restores correct pressure regulation and reliable system performance.
This CRI 8 model is engineered to Viessmann’s original specifications, ensuring correct capacity, fitment, and long-term durability in domestic heating systems.
Features
- Genuine Viessmann OEM replacement part
- 8-litre capacity expansion vessel (CRI 8)
- Stabilises heating system pressure during operation
- Protects boiler components from pressure surges
- Helps prevent pressure loss and system faults
- Pre-charged diaphragm/bladder design for efficiency
- Designed for high-pressure sealed heating systems
- Compatible with selected Vitodens boiler models
- Durable construction for long service life
- Essential for safe and reliable boiler performance
Viessmann provide a 1 year warranty on all spare parts. Electrical Deals Direct now sells a wide range of spare parts. If you cannot see the item you require on our website, please call 01934 253600 or email [email protected] for more information.
| MPN | 7828646 |
|---|---|
| Product Code | EDDVIESSMANNSPARE10 |
| Compatible With: Product Code (SKU) | Viessmann Vitodens 100-W WB1B 26/30/35kW Combi & System |
| Part Origin | Compatible |
| Part or Accessory? | Part |
| Brand | Viessmann |
| Full Weight (kG) | 1 |
Delivery Information -
Standard delivery for all orders over £150 ex-VAT are free of charge.
If we can speed this up, we will, but you can also select Express Delivery when you check out and get your purchase more quickly (usually the next working day, subject to a 1pm cut-off): there is an extra charge for this ranging from £5 to £29.99 depending on the products you are buying.
We partner with several of the best UK carriers (such as TNT, Royal Mail, DPD etc) depending on the type of product and the warehouse it is coming from, and also with some pallet companies for larger items. All of these operate during normal Monday – Friday working hours, and we expect all deliveries to arrive in 5 days. For more details checkout this page.
Gledhill Cylinders – Delivery Charge -
For all Gledhill Cylinders, a flat delivery charge of £33.00 (ex-VAT) applies, regardless of order value or delivery method. This will be added automatically at checkout.
Returns Information -
Having to return a product because it doesn’t fit, or is not what you wanted, is really annoying! To try and make sure this isn’t necessary we have lots of helpful advice on our site, and you should feel free to call our experts on the number above to check if you are in any doubt at all – we’re always happy to help.
But if you do, don’t worry, just contact us and we’ll get it sorted (note that for trade customers there may be a restocking fee). If you need it, we can usually arrange the carrier to pick it up.
For full details of our policy, check out the small print here.
Viessmann 7828646 Expansion Vessel CRI 8 | Replacement Spare Part
The Viessmann 7828646 Expansion Vessel CRI 8 is a genuine replacement part designed for compatible Viessmann Vitodens boiler systems. Its main function is to absorb excess pressure created when water heats and expands within a sealed heating system, preventing damage to internal components and maintaining safe operating conditions.
Inside the vessel, a pre-charged air bladder compresses as system pressure rises, helping to stabilise fluctuations and reduce strain on the boiler’s pump, seals, and pipework. Over time, expansion vessels can lose pressure or fail internally, leading to symptoms such as pressure drops, frequent topping up, or boiler fault codes. Replacing a faulty unit restores correct pressure regulation and reliable system performance.
This CRI 8 model is engineered to Viessmann’s original specifications, ensuring correct capacity, fitment, and long-term durability in domestic heating systems.
Features
- Genuine Viessmann OEM replacement part
- 8-litre capacity expansion vessel (CRI 8)
- Stabilises heating system pressure during operation
- Protects boiler components from pressure surges
- Helps prevent pressure loss and system faults
- Pre-charged diaphragm/bladder design for efficiency
- Designed for high-pressure sealed heating systems
- Compatible with selected Vitodens boiler models
- Durable construction for long service life
- Essential for safe and reliable boiler performance
Viessmann provide a 1 year warranty on all spare parts. Electrical Deals Direct now sells a wide range of spare parts. If you cannot see the item you require on our website, please call 01934 253600 or email [email protected] for more information.
| MPN | 7828646 |
|---|---|
| Product Code | EDDVIESSMANNSPARE10 |
| Compatible With: Product Code (SKU) | Viessmann Vitodens 100-W WB1B 26/30/35kW Combi & System |
| Part Origin | Compatible |
| Part or Accessory? | Part |
| Brand | Viessmann |
| Full Weight (kG) | 1 |
Delivery Information -
Standard delivery for all orders over £150 ex-VAT are free of charge.
If we can speed this up, we will, but you can also select Express Delivery when you check out and get your purchase more quickly (usually the next working day, subject to a 1pm cut-off): there is an extra charge for this ranging from £5 to £29.99 depending on the products you are buying.
We partner with several of the best UK carriers (such as TNT, Royal Mail, DPD etc) depending on the type of product and the warehouse it is coming from, and also with some pallet companies for larger items. All of these operate during normal Monday – Friday working hours, and we expect all deliveries to arrive in 5 days. For more details checkout this page.
Gledhill Cylinders – Delivery Charge -
For all Gledhill Cylinders, a flat delivery charge of £33.00 (ex-VAT) applies, regardless of order value or delivery method. This will be added automatically at checkout.
Returns Information -
Having to return a product because it doesn’t fit, or is not what you wanted, is really annoying! To try and make sure this isn’t necessary we have lots of helpful advice on our site, and you should feel free to call our experts on the number above to check if you are in any doubt at all – we’re always happy to help.
But if you do, don’t worry, just contact us and we’ll get it sorted (note that for trade customers there may be a restocking fee). If you need it, we can usually arrange the carrier to pick it up.
For full details of our policy, check out the small print here.
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