Description

Viessmann 7837231 Expansion Vessel – Cri 8 – System/Combi

This Viessmann expansion vessel helps regulate boiler pressure by absorbing excess water volume during heating. The 8ltr expansion tank ensures safe and stable operation in pressurised heating systems. Part number 7837231 fits various Viessmann models and supports long-term boiler performance.

Compatible Boilers

This part is compatible with the following models:

100 WB1C Series

CB 19kW System – GC 41-819-26
CB 26kW Combi – GC 47-819-20
CB 26kW System – GC 41-819-27
CB 30kW Combi – GC 47-819-21
CB 30kW System – GC 41-819-28
CB 35kW Combi – GC 47-819-22
CB 35kW System – GC 41-819-29

100 WB1HA Series

System 19kW ErP – GC 41-819-36
System 26kW ErP – GC 41-819-37
System 30kW ErP – GC 41-819-38
System 35kW ErP – GC 41-819-39

100 WB1HC Series

System 19kW – GC 41-819-40
System 26kW – GC 41-819-41
System 30kW – GC 41-819-42
System 35kW – GC 41-819-43

100 WB1KC Series

Combi 26kW – GC 47-819-40
Combi 30kW – GC 47-819-41
Combi 35kW – GC 47-819-42

100 WBP JA Series

Combi 25kW – GC 47-819-26
Combi 29kW – GC 47-819-27

100-W WB1C Series

Combi 30kW – Serial No. 7441745

If you’re looking for a Viessmann 7828646 Expansion Vessel CRI 8 or any other different Viessmann Expansion Vessel, follow the link provided.

Why Choose This Product?

This Viessmann expansion vessel prevents damage from pressure spikes and thermal expansion. It helps ensure smooth boiler operation and protects internal components. You’ll avoid costly repairs by replacing worn or faulty vessels early.

Engineered by Viessmann, this genuine part meets the highest performance standards. Backed by a 12-month warranty, it gives you reliable support and lasting value. Install this part to maintain your system’s pressure balance and safety.

Delivery and Return

Place orders before 1 PM for same-day dispatch via reliable couriers. Choose from standard or next-day delivery options. Returns are accepted within 30 days if the part is unused and in original packaging. Always use a Gas Safe registered engineer for installation and compliance.