Hvac / Heat Pumps
Viessmann Vitocell 100-V/100-W Storage Water Heater Installation Manual
Professional installation guide for Viessmann Vitocell 100-V and 100-W storage water heaters, covering setup, connection, and safety requirements.
Table of contents
Product Overview
The Viessmann Vitocell 100-V and 100-W are high-quality, enamelled, internally heated storage water heaters designed for domestic hot water production. They are suitable for use in conjunction with boilers, wall-mounted units, and/or electric heating elements. The Vitocell 100-V is available in capacities ranging from 160 to 950 liters, while the Vitocell 100-W is available in capacities from 160 to 300 liters. These units are designed for stationary installation in closed systems according to DIN 1988 and EN 12828 standards.
Safety Information
Installation and maintenance must be performed exclusively by authorized professionals. Before starting any work, ensure the system is disconnected from the power supply and secured against accidental reactivation. Wear appropriate protective clothing. Be aware that hot surfaces can cause burns; allow the unit to cool down before servicing. Keep the installation area clean and dry to prevent slipping hazards. Ensure that small parts from insulation materials are kept away from children to prevent choking hazards.
Installation and Setup
The water heater must be installed in a frost-protected and draft-free room. Ensure sufficient space is provided for maintenance, particularly for the replacement of the magnesium anode (minimum 850 mm clearance required for 750 and 950-liter models). Use the adjustable feet to level the unit, ensuring they are not extended beyond 35 mm. When connecting the heating water side, ensure all pipes are connected with detachable fittings and unused ports are sealed with bronze caps. The temperature controller and safety temperature limiter must be set to ensure the water temperature does not exceed 95°C.
Maintenance and Disposal
Regular maintenance is essential for the safe operation of the system. Defective components must be replaced with original Viessmann parts. When the unit reaches the end of its service life, it must be decommissioned by a professional, ensuring the system is depressurized and cooled. Viessmann products are recyclable; components and operating fluids should not be disposed of in household waste but rather through authorized collection systems or municipal facilities.
Manufacturer information
Viessmann Climate Solutions
Practical help
Common problems
System overheating
Ensure the temperature controller and safety temperature limiter are correctly set to prevent water temperatures above 95°C.
Material damage due to frost
Install the unit in a frost-protected room or drain the water heater if it is not in operation during freezing conditions.
Electrostatic damage to electronics
Touch grounded objects like heating or water pipes before working on the unit to discharge static electricity.
Before use
- Verify the system is disconnected from power and secured.
- Ensure the installation room is frost-protected.
- Check that the magnesium anode is correctly connected.
- Ensure all pipe connections are tight and use detachable fittings.
- Verify the safety valve is installed in the cold water line.
- Confirm the unit is leveled using the adjustable feet.
- Ensure the discharge pipe of the safety valve is not obstructed.
Specs in practice
- Max. Operating Pressure (Heating)
- Maximum pressure the heating side can withstand (varies by model, up to 25 bar).
- Max. Operating Pressure (Drinking Water)
- Maximum pressure the domestic water side can withstand (10 bar).
- Max. Trinkwassertemperatur
- Maximum allowable domestic hot water temperature is 95°C.
Model compatibility
- Suitable for systems according to DIN 1988, EN 12828, and DIN 4753.
- Compatible with boilers, wall-mounted units, and electric heating elements.
- For multi-cell battery configurations, specific manifold dimensions apply.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.