Viessmann manometer pressure gauge 7834985

Viessmann manometer pressure gauge 7834985

The Viessmann 7834985 Manometer is a genuine pressure gauge designed for accurate monitoring of system pressure in Viessmann domestic boilers. This high-reliability gauge provides clear, consistent readings, ensuring safe boiler operation and helping diagnose pressure-related faults such as low pressure, leaks, or expansion vessel issues.

Manufactured to Viessmann OEM standards, this manometer offers long-term stability, secure sealing and precise calibration—making it the correct replacement part for various Viessmann boilers across the Vitodens and Vitoserv ranges.

Key Features

• Genuine Viessmann pressure gauge

• OEM part number 7834985

• Provides accurate system pressure readings

• Ensures safe boiler performance and protection

• High-quality sealed construction for long service life

• Clear, easy-to-read analogue dial

• Direct replacement for worn or faulty gauges

Compatibility
Commonly used on:

• Selected Viessmann Vitodens boilers

• Various Viessmann system and combi models requiring gauge 7834985

(Always confirm compatibility with your boiler model or service manual.)

When to Replace

• Boiler display shows pressure but gauge does not match

• Gauge needle is stuck, erratic, or not returning to zero

• Evidence of water ingress, fogging, or internal corrosion

• Regular pressure drops requiring frequent top-ups

• During annual servicing if readings are unreliable

Technical Specifications

• Manufacturer: Viessmann

• Part Number: 7834985

• Type: Analogue manometer (pressure gauge)

• Function: System pressure measurement for heating circuits

• Application: Viessmann gas boiler ranges