Vitodens 100-W B1GA 25 kW Heat Only

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£1,523.59 inc VAT
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Vitodens 100-W 11kW Heat only boiler.

The new Vitodens 100-W B1GA heat only boiler is an attractively priced wall mounted gas condensing boiler, ideally suited for existing open vented or sealed systems.


  • Gas condensing heat only boiler for open vent and sealed systems
  • output from 3.2 to 11kW
  • ERP efficiency 92% (Hs)
  • Energy efficiency class: A
  • Lambda Pro for exceptional performance, high efficiency and low emissions
  • Compact design for cupboard installation
  • Ideal for bungalow application with its low static water head requirement
  • Low weight, easy to handle

Product benefits:

  • Particularly attractive price/performance ratio
  • Durable and efficient due to Inox-Radial stainless steel heat exchanger
  • MatriX-Plus burner
  • Easy operation via control unit with LED display and touch buttons
  • Internet capability with WiFi ready for ViCare app (modem accessory required, see Accessories tab)
  • Ideal for installation in living areas thanks to its low operating noise and compact dimensions
  • LPG configurable through control settings

Touch screen Display

The boiler can be controlled by the new LCD touch screen, some of the display features:

  • User-friendly touch buttons enable the heating temperature to be set quickly
  • Operating status and temperature information shown on display
  • Discreet black panel visual design

Standard delivery/equipment level

  • Modulating and fan-assisted MatriX-Plus burner
  • Constant temperature and weather-compensated control unit
  • Power cable
  • Fully plumbed and wired
  • Boiler flue connection
  • Gas shut-off valve
  • Wall mounting bracket

To complete your installation the following may required:

  • A suitable flue (see Flue tab)
  • Modem for internet WiFi connection and ViCare app (see accessories tab)
  • An outdoor temperature sensor for weather compensation operation (see Accessories tab)

Viessmann ViCare Application (WiFi Modem required):

Vitodens 100-W B1GA 25 kW Heat Only Vitodens 100-W B1GA 25 kW Heat Only


Device 11kW 16kW 19kW 25kW 32kW
Efficiency class A A A A A
Rated heat outputs
50/30 °C 3.2-11.0 kW 3.2-16.0 kW 3.2-19.0 kW 3.2-25.0 kW 3.2-32.0 kW
80/60 °C 2.9-09.9 kW 2.9-14.4 kW 2.9-17.0 kW 2.9-22.5 kW 2.9-30.0 kW
Depth 285mm 285mm 285mm 285mm 340mm
Width 375mm 375mm 375mm 375mm 375mm
Height 600mm 600mm 600mm 600mm 600mm
Weight 23kg 23kg 23kg 23kg 23kg
Flue connections
Flue gas connection 60mm 60mm 60mm 60mm 60mm
Ventilation air connection 100mm 100mm 100mm 100mm 100mm

Mobile applications and energy management systems.

Vitodens 100-W B1GA 25 kW Heat Only Connectivity Inside.

Connectivity inside is the intergrated WiFi interface for operating and servicing systems using Viessmann Apps.

Vitodens 100-W B1GA 25 kW Heat Only Communication technology.

ViCare app – mobile applications for system users:

  • Mobile operation of the heating system for heating and DHW.
  • Assistance functions and fault display with option for direct connection to a contractor for service requests.

Vitodens 100-W B1GA 25 kW Heat Only Vitodens 100-W B1GA 25 kW Heat Only

Vitodens 100-W B1GA 25 kW Heat Only Tools for service, maintenance and commissioning.

ViGuide – mobile applications for trade partners:

  • Service and maintenance with ViGuide for optimising workflows in the Viessmann trade partner's business.
  • Ensures customer-friendly online service for the system user, provided they have enabled service via the ViCare app.
  • Straightforward and efficient commissioning of heat generators with integral communication module and battery storage systems, performed by heating contractors using Viguide.
  • In addition to the free version, ViGuide Plus and ViGuide Pro are also available as paid-for versions with additional analysis, remote maintenance and optimisation functions.

Vitodens 100-W B1GA 25 kW Heat Only Vitodens 100-W B1GA 25 kW Heat Only

Energy management systems.

Viessmann energy management:

  • Viessmann energy management is integrated into the latest generation of Viessmann heat pumps and energy storage units
  • It enables balanced operation of the components in the house that generate, consume or store electricity.
  • The focus is on optimising self-consumption of self-generated electricity from photovoltaic systems.
  • The energy management system provides extended information about electricity flows and also CO2 savings.
  • If desired, customers can add further optimisation levels in the ViCare app.

For more information on the system requirements, the functions and use, see Viessmann's Main Website Energy Management

Vitodens 100-W B1GA 25 kW Heat Only Buying into Viessmann.

Viessmann use their best endeavours to ensure that their products are manufactured without any manufacturing or material defects.

In order for your boiler to qualify for a free of charge manufacturer’s guarantee period longer than the minimum 2 year period set out in the standard Terms and Conditions of Sale, your installation must be registered with Viessmann within 30 days of purchase/invoice.

You or your installer can register the installation, using the online or offline options available. The free of charge voluntary guarantee period varies by product, please see below for the period that applies at the time of purchase.

Viessmann Warranty Information and Viessmann Vitodens Guarantee (PDF)

For an extended guarantee, which is offered on some models as a purchase option, your installer must register your installation on the Viessmann Installer Portal for installations in Great Britain.

Vitodens 100-W B1GA 25 kW Heat OnlyReturn of Goods.

We very much hope you will be happy with your products, however we do understand items sometimes need to be returned.
Condition is all important, an item should have been treated in the same way as if it was on sale in a shop, unopened and unused with seals intact.
Large palleted items (boilers, heat pumps, cylinders etc.) must be returned as delivered, strapped and wrapped to the pallet, unopened.


Our returns policy can be found here.

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