Australia
New Zealand
Greece
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.
The Vitodens 343‑F is a gas condensing storage combi boiler designed for residential heating systems with high demands for energy efficiency and domestic hot water comfort. With a heating output range of 1.9 to 19 kW and an integrated hot water storage system, it ensures stable heating operation and excellent DHW availability even at low heat demand.
Thanks to its large modulation range up to 1:10, stainless steel Inox‑Radial heat exchanger, and MatriX‑Plus burner with Lambda Pro Plus, the Vitodens 343‑F achieves consistently high efficiency, low emissions, and long service intervals. Smart operation via the ViCare app, integrated WLAN, and advanced diagnostics make it a future‑ready heating solution.
Digital boiler and heating circuit control with sliding reduced boiler water temperature.
Suitable for:
One direct heating circuit (without mixer)
Up to three mixed heating circuits via extension sets (package or accessories)
Two pump outputs for:
Accumulator charge pump (factory‑connected)
Secondary heating circuit pump or DHW circulation pump (depending on hydraulics)
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 | English | Download |
Its wide modulation range and pause‑time optimisation minimise cycling and maintain high efficiency.
Yes. It supports solar DHW heating with more than 50% solar coverage.
It automatically adapts combustion to different gas qualities, ensuring efficient and clean operation.
It is ideal for homeowners seeking:
Compact gas condensing technology
High DHW comfort
Low emissions and operating costs
Smart, app‑based control
Future‑ready system integration
This heating system features high energy efficiency, a cylinder loading system, built-in solar components, and minimal space requirements. Rated heating power: 2.5 – 25 kW
Gas condensing storage combination boiler with integrated 100 litre charging cylinder or 130 litre DHW cylinder with internal indirect heat exchanger for maximum heating convenience. Rated heat output: 1.9 – 32 kW
Get directed to our Business Development team to start the authorization process and discuss sales support.
Get specialized help with system sizing, load
calculation analysis, and technical data required for project design.
Request support for warranty claims,
scheduled maintenance, and genuine spare
parts ordering.
For more information : ahi@ahi-carrier.com