Vitocell 120-E

Viessmann Water Heater
Vitocell 120-E
Buffer tank for water heating

Vitocell 120-E

For heating water storage and drinking water heating with Vitotrans 353, in conjunction with heat pumps. 600 and 950 liters.

Combination with heat pumps
Two memory zones
Fresh water module Vitotrans 353
Easy connection of second heat generator

Vitocell 120-E

The Vitocell 120‑E is a safe and reliable heating water buffer tank designed to stabilise and optimise modern heating systems—particularly heat pump installations. It efficiently decouples heat generation from heat demand, improving system efficiency, reducing cycling, and extending the service life of connected heat generators.
Thanks to its modular design, the Vitocell 120‑E can be expanded with a fresh water module and an electric heating insert, making it a flexible solution for both current and future system requirements.

Vitocell 120-E

Optimised for Heat Pump Systems

Designed to work seamlessly with heat pumps, ensuring stable operation and efficient heat distribution.

Two Functional Storage Zones

The tank provides separate zones for the heating circuit and optional fresh water module, supporting flexible system layouts.

Easy Integration of a Second Heat Generator

Additional connections allow straightforward expansion, making it easy to add a second heat source to the system.

Optional Electric Heating Insert

An electric immersion heater can be retrofitted for: PV surplus utilisation Additional heating support Emergency or summer operation

Flexible System Integration

Suitable for combination with:

Heat pumps
Gas or oil boilers
Renewable hybrid systems

Fresh Water Module Integration

The Vitotrans 353 can be added at any time, allowing future‑proof DHW preparation.

Electric Heating Control

Optional electric heating insert can be integrated into energy management strategies, including PV self‑consumption.

Service‑Friendly Layout

Clearly arranged connections simplify installation, commissioning, and maintenance.

Document Name Description Document Type Language Action
Brochure Vitocell storage water heater PDF German Download
Data Sheet Vitocell 120-E PDF German Download
What is the main purpose of the Vitocell 120‑E?

It acts as a buffer between heat generation and heat demand, improving efficiency and system stability.

Why is a buffer tank important for heat pumps?

It prevents short cycling, improves efficiency, and ensures reliable operation under varying load conditions.

Can the Vitocell 120‑E provide domestic hot water?

Yes. When combined with the Vitotrans 353 fresh water module, it provides hygienic DHW on demand.

Who should choose the Vitocell 120‑E?

It is ideal for users who want:

Stable heat pump operation
Flexible system expansion
Optional hygienic DHW preparation
Low heat losses and high efficiency

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