Viessmann Vitodens Classic 28kW BPKB Combi Boiler & Horizontal Flue

Description

This bundle pairs the Viessmann Vitodens 025-W BPKB 28kW combi boiler with a matching 60/100mm horizontal flue kit, giving installers a complete, ready-to-fit package for external wall termination installations in one order.

Built around the Inox-Radial stainless steel heat exchanger and MatriX-Plus burner shared across the Vitodens range, this compact combi delivers heating and instantaneous hot water for medium-sized homes from a footprint small enough to sit inside a standard kitchen cupboard.

28kW

DHW output

5.0-25.0kW

Heating output range

92%

ErP space heating efficiency

Class A

Energy efficiency

12 l/min

DHW flow rate (ΔT 35°C)

Horizontal

Flue included

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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: Registering the installation on the Viessmann installer portal (VPlus) within 30 days extends the standard 2-year warranty to 5 years, alongside a 10-year warranty on the Inox-Radial heat exchanger.

Complete boiler and flue package

Bundles the 28kW combi with a 60/100mm horizontal flue kit, so everything needed for a wall-terminated installation arrives together.

Inox-Radial stainless steel heat exchanger

Provides high corrosion resistance and a long operational life, backed by a 10-year heat exchanger warranty.

MatriX-Plus burner system

Delivers consistently clean combustion across a 1:5 modulation range (5.0 to 28kW).

Compact 700 x 400 x 300mm footprint

One of the smallest wall-mounted boilers in its output class, well suited to medium-sized homes.

Pre-commissioned for fast installation

Only two button pushes are needed to complete commissioning, minimising time on site.

Horizontal flue for external wall termination

The included 60/100mm horizontal kit gives a straightforward rear or side wall finish without roof access.

Specification

Boiler Performance

Boiler type

Gas condensing combi (Type BPKB-28)

Rated heat output (50/30°C)

5.0 – 25.0 kW

Rated heat output (80/60°C)

4.5 – 22.7 kW

Combi DHW output

28kW

DHW draw-off rate (ΔT 35°C)

12 l/min

ErP space heating efficiency

92%

Energy efficiency class

A

Modulation range

1:5

Boiler Dimensions

Height

700mm

Width

400mm

Depth

300mm

Weight

35kg

Flue gas connection

60mm

Ventilation air connection

100mm

Included Horizontal Flue Kit

Diameter

60/100mm concentric

Kit length

1 metre (standard horizontal)

Elbow type

Reduced height (30mm lower than standard)

Included parts

Terminal, elbow, internal and external wall bezels, sealing sachet

Warranty

Standard warranty

2 years

Registered warranty (VPlus)

5 years

Heat exchanger warranty

10 years

What's included in this bundle?

This package includes the Viessmann Vitodens 28kW BPKB combi boiler and a matching 60/100mm horizontal flue kit with reduced height elbow, so no separate flue purchase is needed.

Is a protective grille needed with the flue?

Only if the external wall terminal finishes at 2 metres or less above ground level near a public road or footpath — a matching grille accessory is available separately.

What size property suits the 28kW Vitodens combi?

A 28kW combi typically suits a 2-4 bedroom home with one bathroom, depending on radiator count and insulation standard — a heat loss calculation confirms exact sizing.

Can this bundle be used with a vertical flue instead?

This bundle is specifically supplied with a horizontal flue kit. If roof termination is preferred, the equivalent vertical flue bundle is a better fit.

Does registering the boiler extend the warranty?

Yes, registering the installation on the Viessmann installer portal (VPlus) within 30 days extends the standard 2-year warranty to 5 years, with a 10-year warranty on the heat exchanger.

BTU Calculator

BTU & WATT Calculator

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)

Calculate

Required Heating

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Watts

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