Viessmann 100 WB1C Expansion Vessel 8 Litre – Refurbished | MPN 7837231

Pressure stability isn't a luxury in a heating system — it's a necessity. The Viessmann 8 Litre Expansion Vessel (MPN 7837231) is engineered to maintain that stability by continuously absorbing the pressure changes that occur as water heats and cools within your sealed circuit. Left unmanaged, those fluctuations place significant stress on your boiler's internal components — leading to wear, leaks, and eventually, failure. This vessel ensures that never happens.

Designed specifically for the Viessmann 100 WB1C, it slots in as a precise like-for-like replacement, restoring your system's pressure management without any modifications or guesswork. With an 8-litre capacity, it delivers consistent and reliable performance across every heating cycle — season after season.

This is a professionally refurbished genuine Viessmann component, thoroughly inspected, cleaned, and tested under real operating conditions before dispatch. Same quality. Smarter price.

• Viessmann 100 WB1C Expansion Vessel (8ltr)
• Part Number: 7837231
• Condition: Refurbished
• Comes with 12-months warranty
• Compatible with Viessmann 100 WB1C, WB1HA, WB1HC, WB1KC, and WBP JA boiler series

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Restored to Perform. Backed to Last.

Every refurbished unit is put through a rigorous testing and inspection process — only those that meet the required performance benchmarks make it to dispatch. You're not getting a gamble, you're getting a verified, warranty-backed component that's ready to install and built to last. The 12-month warranty included with every unit ensures that confidence doesn't end at the checkout.

It's also the sustainable choice — extending the life of a perfectly functional Viessmann part rather than adding to unnecessary manufacturing waste.

Delivery & Returns

Order before 3:00 PM for same-day dispatch via reliable couriers, with both standard and next working day delivery options available. Returns accepted within 30 days, provided the part is unused and in its original packaging.

Note : Please confirm that MPN 7837231 matches your existing part before placing your order. Installation must always be carried out by a Gas Safe registered engineer to ensure safety compliance and warranty validity.