Viessmann Vitodens 050-W 30kW B0KA Combi Boiler | 7098602

Description

The Viessmann Vitodens 050-W is an attractively priced wall-mounted gas condensing combi boiler, built around Viessmann's own Inox-Radial stainless steel heat exchanger and modulating MatriX cylinder burner — the same core technology used across the wider Vitodens range, in a genuinely compact footprint.

At just 700mm high and 300mm deep, it's small enough to fit inside a standard kitchen cupboard, yet still delivers up to 97% gross seasonal efficiency, making it a strong value option for both new build and boiler replacement projects.

30kW

Combi output

97%

Gross seasonal efficiency

Class A

Energy efficiency

1:4

Modulation range

14.3 l/min

DHW flow rate

35kg

Weight

🛈

Please Note: This boiler must be connected using the Viessmann 60/100mm concentric flue system, tested and CE-designated as one structural unit with the boiler in accordance with DVGW-VP 113. Only this flue system may be used.

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Good to Know: Approved for a hydrogen admixture of up to 20% by volume and tested to EN 15502, this Vitodens 050-W requires no conversion kit for LPG — switching gas type is done entirely from the control unit.

Inox-Radial stainless steel heat exchanger

Delivers high operational reliability and a long service life on a very small footprint.

Modulating MatriX cylinder burner

Consumes relatively little natural gas with lower CO2 emissions across a wide 1:4 modulation range.

Integral WiFi control unit

Built-in wireless interface supports the ViCare app for remote heating and hot water control, with no separate modem required.

Compact 700 x 400 x 300mm footprint

Small enough to be fitted inside a kitchen cupboard, ideal for flats and space-constrained properties.

Integral instantaneous DHW heating

A plate heat exchanger provides direct hot water on demand with a diverter valve, up to 14.3 l/min flow at a 30K rise.

Variable speed circulation pump

The integral high-efficiency pump adjusts its speed automatically, reducing electricity consumption compared with fixed-speed pumps.

Specification

Performance

Boiler type

Gas condensing combi (Type BPJD)

Rated heat output (50/30°C)

3.2 – 25.0 kW

Rated heat output (80/60°C)

2.9 – 22.4 kW

DHW output

29.6 kW

DHW flow rate

12.2 l/min

Standard seasonal efficiency (Hs)

Up to 97%

Energy efficiency class

A

Modulation range

1:4

Gas & Electrical

Gas types

Natural gas and LPG (no conversion kit required)

Hydrogen compatibility

Up to 20% H2 blend

Natural gas supply pressure

20 mbar

LPG supply pressure

50 mbar

Electrical supply

230V~, 50Hz

Fuse protection

10A recommended

Dimensions & Connections

Height

707mm

Width

400mm

Depth

300mm

Weight

35kg

Flue gas connection

60mm

Ventilation air connection

100mm

Gas connection

G 3/4"

Heating flow/return

G 3/4"

DHW/cold water connections

G 1/2"

Expansion & Circulation

Integral expansion vessel

8 litres, 0.8 bar pre-charge

Max. permissible operating pressure

3 bar

Sound power level (rated output)

45 dB(A)

Sound power level (partial load)

39 dB(A)

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Good to Know: Fill and top-up water must meet Viessmann's water quality requirements (see VDI 2035 or local equivalent). From a water hardness of 20°dH and above, a water treatment system in the cold water supply is recommended to protect the plate heat exchanger from limescale build-up.

What size property suits the 30kW Vitodens 050-W combi?

A 25kW-35kW combi range typically suits a 2-4 bedroom home with one bathroom, depending on radiator count, insulation standard and simultaneous hot water demand — a heat loss calculation is the reliable way to confirm the right size.

Does this boiler need a conversion kit for LPG?

No, the Vitodens 050-W runs on natural gas or LPG with the fuel type simply reconfigured at the control unit — no physical conversion kit is required.

Can this boiler run on a hydrogen gas blend?

Yes, it's approved for operation with a hydrogen admixture of up to 20% by volume, giving some future-proofing as UK gas networks trial hydrogen blending.

What flue system is required?

Only the Viessmann 60/100mm concentric flue system, CE-designated as one structural unit with the boiler, may be used — third-party flue systems are not certified for this appliance.

Does the 050-W come with WiFi built in?

Yes, the control unit has an integral WiFi interface for the ViCare app, so no separate internet module or modem is needed for remote monitoring and control.

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Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

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Required Heating

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Watts

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