Viessmann Vitodens 100-W 32kW B1GA Heat Only Boiler | 7098665

Description

The Viessmann Vitodens 100-W B1GA is a heat-only (regular) gas condensing boiler, purpose-built for existing open vented or sealed heating systems where the property already has a separate hot water cylinder and feed/expansion arrangement in place.

With its compact 375mm-wide, 285mm-deep casing and light weight, this 32kW model is well suited to bungalow replacements and other properties where the existing cylinder and pipework are being retained rather than upgraded to a system boiler.

32kW

Heat only output

92%

ErP efficiency (Hs)

Class A

Energy efficiency

23kg

Weight

340mm

Depth

Lambda Pro

Combustion control

🛈

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, with maximum flue lengths varying by model — check the installation manual for the exact figure.

🛈

Please Note: This is a heat-only appliance — it provides central heating output only and does not include a hot water cylinder or DHW heating function. It's compatible with any existing cylinder, open vented or sealed, but is not compatible with solar thermal panels feeding the cylinder.

Ideal for open vent or sealed system upgrades

Purpose-designed for existing heating systems where the cylinder and pipework are being retained during a boiler swap.

Lambda Pro combustion control

Provides exceptional performance, high efficiency and low emissions across the boiler's modulation range.

Compact, lightweight casing

At just 23kg and a slim 375mm width, it suits tight cupboard spaces and bungalow-style installations.

Inox-Radial stainless steel heat exchanger

Delivers corrosion resistance and a long operational life on a compact footprint.

Touchscreen control unit

Operating status, temperature and heating settings are all managed via the LCD touch screen display.

WiFi ready with optional modem

Internet capability for the ViCare app is available via an optional WiFi modem accessory.

Specification

Performance

Boiler type

Gas condensing heat only boiler (Type B1GA)

Rated heat output (50/30°C)

3.2 – 32.0 kW

Rated heat output (80/60°C)

2.9 – 30.0 kW

ErP efficiency (Hs)

92%

Energy efficiency class

A

Dimensions & Connections

Height

600mm

Width

375mm

Depth

340mm

Weight

23kg

Flue gas connection

60mm

Ventilation air connection

100mm

Standard Delivery

Burner

Modulating and fan-assisted MatriX-Plus burner

Control

Constant temperature and weather-compensated control unit

Gas isolation

Gas shut-off valve included

Mounting

Wall mounting bracket, fully plumbed and wired

What does 'heat only' mean for this boiler?

A heat-only (regular) boiler provides central heating output alone — it does not generate hot water directly and relies on an existing separate hot water cylinder for DHW.

Can this boiler be used with a solar thermal cylinder?

No, Viessmann specifies this model as not compatible with solar panel-fed cylinders.

Is a WiFi modem included as standard?

No, WiFi/ViCare app connectivity requires an optional modem accessory on this heat-only model — it isn't built in as standard.

Will this boiler work with my existing open vented system?

Yes, the Vitodens 100-W B1GA is designed to be compatible with existing open vented or sealed heating systems and any compatible cylinder type.

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

0

Watts

0

BTUs