Description
The Viessmann 7836994 expansion vessel is a brand-new genuine replacement component for selected Viessmann Vitodens 200-W B2HA, B2KA and B2KB boilers. It is supplied with a 12-month warranty and should be ordered only after confirming the full appliance model and serial number.
The expansion vessel accommodates changes in heating-water volume as the system heats and cools, helping the boiler maintain stable system pressure. Installation should be completed by a suitably qualified Gas Safe registered engineer.
Product Details
Brand: Viessmann
Part type: Expansion Vessel
MPN: 7836994
Condition: New and genuine
Warranty: 12 months
Boiler Compatibility
Viessmann Vitodens 200-W B2HA System Boilers
200-W B2HA 19kW System – Serial No. 7454868
200-W B2HA 26kW System – Serial No. 7454869
200-W B2HA 30kW System – Serial No. 7454871
200-W B2HA 35kW System – Serial No. 7454873
Viessmann Vitodens 200-W B2KA Combi Boilers
200-W B2KA 26kW Combi – Serial No. 7454870
200-W B2KA 30kW Combi – Serial No. 7454872
200-W B2KA 35kW Combi – Serial No. 7454874
Viessmann Vitodens 200-W B2KB Combi Boilers
200-W B2KB 26kW Combi – Serial No. 7570789
200-W B2KB 30kW Combi – Serial No. 7570791
200-W B2KB 35kW Combi – Serial No. 7570793
Delivery & Collection
Collection is available from our Newcastle showroom at Unit 5, Penn Street, Newcastle upon Tyne, NE4 7BG, usually on the same day, subject to stock availability. If the item is not in stock, collection is normally available the next working day. We also offer fast UK delivery through Royal Mail First Class or DPD Next Day, with most orders arriving within one to two working days. Boiler components should be installed by a suitably qualified Gas Safe registered engineer.
Warranty
This brand-new genuine Viessmann boiler expansion vessel is supplied with a 12-month warranty. Warranty claims may be subject to inspection and confirmation that the component was correctly selected and professionally installed.
Returns
We accept returns within 30 days of delivery. The product must be unused, unfitted and returned in its original unopened packaging with all seals intact. We cannot accept returns for components that have been fitted, used, damaged or returned in an unsuitable condition. Please check the boiler model, GC number, edition, serial-number range and part number carefully before ordering.
If you need any help, our team is happy to assist. Please contact us by phone or WhatsApp chat.
Frequently Asked Questions
Is the Viessmann 7836994 expansion vessel compatible with Vitodens 200-W boilers?
Yes. It is confirmed for the listed Viessmann Vitodens 200-W B2HA system boilers and B2KA and B2KB combi boilers. Compatibility depends on the complete appliance model and serial number.
Does this expansion vessel fit the Viessmann 200-W B2HA 35kW System?
Yes. It is listed as compatible with the Viessmann 200-W B2HA 35kW System with serial number 7454873.
Does Viessmann part 7836994 fit B2KA and B2KB combi boilers?
Yes. The part is confirmed for the listed 26kW, 30kW and 35kW B2KA and B2KB combi models. Check the appliance serial number before ordering.
How can I confirm that 7836994 is the correct expansion vessel?
Compare the part number with the existing component and check the boiler’s complete model and serial number against the compatibility list. A boiler-parts specialist or Gas Safe registered engineer can assist when the original number is unclear.
What symptoms may indicate an expansion-vessel problem?
Possible symptoms can include repeated pressure loss, a rapid rise in pressure while the boiler heats or water discharging from the pressure-relief pipe. These symptoms do not automatically confirm that the expansion vessel is defective, so professional diagnosis is recommended.
Does this expansion vessel require professional installation?
Yes. The boiler should be inspected and the expansion vessel installed by a suitably qualified Gas Safe registered engineer.
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