Description
Viessmann 7834985 Pressure Gauge (Replaces 7828644)
The Viessmann 7834985 Pressure Gauge is the updated official replacement for the discontinued part 7828644. Essential for monitoring your system’s water pressure, this part ensures your Vitodens 100-W boiler operates safely within the correct bar range.
Compatible Boilers
This part is compatible with the following models:
Viessmann Vitodens 100 WB1C Series
100 WB1C 26kW Combi: (GC No: 47-819-20, Serial: 7499425)
100 WB1C 30kW Combi: (GC No: 47-819-21, Serial: 7499427 & 7441745)
100 WB1C 35kW Combi: (GC No: 47-819-22, Serial: 7499429)
Viessmann Vitodens 100-W WB1B Series
100-W WB1B 26kW Combi: (GC No: 47-819-12, Serial: 7373061)
100-W WB1B 26kW System: (GC No: 41-819-18, Serial: 7373060)
100-W WB1B 30kW Combi: (GC No: 47-819-13, Serial: 7373063)
100-W WB1B 30kW System: (GC No: 41-819-19, Serial: 7373062)
100-W WB1B 35kW Combi: (GC No: 47-819-14, Serial: 7373065)
100-W WB1B 35kW System: (GC No: 41-819-20, Serial: 7373064)
Viessmann Vitodens 100 WBP JA Series
100 WBP JA 25kW Combi: (GC No: 47-819-26, Serial: 7501297)
100 WBP JA 29kW Combi: (GC No: 47-819-27, Serial: 7501298)
If you’re looking for a Viessmann 7837892 Gas Safety Valve – PRV for System & Combi Boilers, follow the link provided.
Why Choose This Product?
Choosing the Viessmann pressure gauge ensures your boiler system stays within safe pressure limits. This gauge delivers precise readings, helping to avoid system faults and prolong boiler life. Viessmann parts come with trusted quality and full manufacturer backing. Installing this part helps maintain efficient heating and hot water supply.
Delivery and Return
Place orders before 1 PM for same-day dispatch via reliable couriers. Choose standard or next-day delivery options to fit your schedule. Returns are accepted within 30 days if the part is unused and in original packaging. Always use a Gas Safe registered engineer to fit this pressure gauge safely and correctly.
FAQs
1. What boilers is the Viessmann 100-W WB1B pressure gauge compatible with?
The pressure gauge 7828644 / 7834985 is compatible with Viessmann 100-W WB1B, 100 WB1C, and 100 WBP JA series boilers, including both combi and system models.
2. What is the purpose of this Viessmann pressure gauge?
This gauge monitors the boiler’s system pressure, helping maintain safe and efficient operation and preventing potential damage from incorrect pressure levels.
3. Can I install this pressure gauge myself?
It is recommended that installation is performed by a Gas Safe registered engineer to ensure safety and proper functioning of your boiler system.
4. Does this part come with a warranty?
Yes, the Viessmann pressure gauge comes with a 12-month warranty, offering coverage for any manufacturing defects or faults.
5. How do I order and receive this Viessmann pressure gauge?
Orders placed before 1 PM are dispatched the same day, with standard and next-day delivery options available. Returns are accepted within 30 days if the part is unused and in its original packaging.









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