Vitodens 343-F

Compact gas condensing technology with high hot water comfort

The Vitodens 343‑F combines efficient gas condensing heating with integrated hot water storage, intelligent control, and smart connectivity—delivering reliable comfort, low emissions, and advanced digital operation for modern homes.

Features

Gas Condensing Storage Combi Boiler
Combines space heating and high domestic hot water comfort in a single compact unit.
Heating Output: 1.9 – 19 kW
Suitable for a wide range of residential heating requirements.
Low Cycle Frequency
Large modulation range (up to 1:10) and pause‑time optimisation ensure stable operation even with low heat demand.
High Efficiency Condensing Technology
Durable stainless steel Inox‑Radial heat exchanger ensures long service life and high efficiency.

Control / Integrations

Weather‑Compensated Heating Control

Digital boiler and heating circuit control with sliding reduced boiler water temperature.

Flexible Heating Circuit Configuration

Suitable for:

One direct heating circuit (without mixer)
Up to three mixed heating circuits via extension sets (package or accessories)

Integrated Pump & Output Management

Two pump outputs for:

Accumulator charge pump (factory‑connected)
Secondary heating circuit pump or DHW circulation pump (depending on hydraulics)

Time Programs & Comfort Functions

Separate schedules for:

Heating circuits
DHW heating
DHW circulation
Includes holiday, holiday‑at‑home, summer economy, screed drying, and hygiene functions.

Document Name	Description	Document Type	Language	Action
System Design Guideline	Vitodens 343‑F	PDF	English	Download

Document Name

Description

Document Type

Language

Action

System Design Guideline

Vitodens 343‑F

PDF

English

Download