Viessmann Vitodens - A Guide to the Range

Which Viessmann Vitodens boilers does iHeat offer?

The Viessmann Vitodens range includes a number of gas condensing boilers, but not every Vitodens model is currently offered through iHeat.

At the time of writing, iHeat lists three Viessmann options:

• Viessmann Vitodens 050-W 25kW combi

• Viessmann Vitodens 100-W 26kW combi

• Viessmann Vitodens 100-W 32kW system boiler

This means the first decision is whether your home is better suited to a combi or system boiler. From there, you can compare the individual models and their specifications.

Viessmann Vitodens range comparison

Property suitability is only a guide. Boiler sizing should account for the home's heat loss, heating system and hot water requirements rather than bedrooms alone.

Viessmann Vitodens 050-W 25kW combi

The Vitodens 050-W 25kW is the current entry point into iHeat's Viessmann combi range.

It is a wall-mounted condensing combi boiler, meaning it provides central heating and hot water without requiring a separate hot water cylinder.

The model currently listed by iHeat measures 400mm wide, 700mm high and 300mm deep, making it the shallowest of the three Viessmann options currently displayed by iHeat.

Key features of the Vitodens 050-W

The Vitodens 050-W incorporates Viessmann technology including its stainless steel Inox-Radial heat exchanger and MatriX-Plus burner.

The current 050-W range also uses Lambda Pro combustion control, which helps the boiler manage combustion according to the gas being supplied.

The 050-W is an A-rated condensing boiler, with Viessmann listing seasonal efficiency of up to 98% under its stated test conditions.

Who could the Vitodens 050-W suit?

The 25kW 050-W may be worth considering if you want a compact Viessmann combi and your property does not require the stored hot water provided by a system boiler.

As with any combi, suitability depends heavily on hot water demand as well as space heating.

A household with high simultaneous hot water demand may need a different solution, so bedroom count alone should not determine the choice.

Advantages of the Vitodens 050-W

• Compact wall-mounted design

• Combi design removes the need for a separate hot water cylinder

• Stainless steel Inox-Radial heat exchanger

• MatriX-Plus burner

• A-rated condensing boiler

• Entry point into iHeat's current Viessmann range

Points to consider

A combi supplies hot water directly rather than storing it in a cylinder. That makes hot water demand particularly important when deciding whether the 050-W is suitable.

Homes that regularly need significant amounts of hot water from multiple outlets may be better assessed for a system boiler rather than simply moving to a larger combi.

Viessmann Vitodens 100-W 26kW combi

The Vitodens 100-W 26kW combi is the other Viessmann combi currently listed by iHeat.

It measures 400mm wide, 700mm high and 350mm deep.

Like the 050-W, the 100-W is a wall-mounted gas condensing boiler and provides heating and instantaneous hot water without a separate cylinder.

Key features of the Vitodens 100-W

The current Vitodens 100-W uses Viessmann's stainless steel Inox-Radial heat exchanger and MatriX-Plus burner.

The wider 100-W range also incorporates Viessmann's electronic combustion control and connected heating functionality.

The 100-W is an A-rated boiler and is designed to work with compatible Viessmann controls and connected heating technology.

iHeat currently advertises a 12-year warranty with its 26kW Vitodens 100-W combi. Always check the warranty conditions supplied with your installation.

Who could the Vitodens 100-W 26kW suit?

The 26kW 100-W is worth comparing with the 050-W if you want a Viessmann combi but are considering the additional features and positioning of the 100-W range.

It remains important to assess hot water demand rather than assuming the 100-W is automatically appropriate because it sits above the 050-W in the range.

Advantages of the Vitodens 100-W combi

• Heating and hot water from one appliance

• Stainless steel Inox-Radial heat exchanger

• MatriX-Plus burner

• Connected control functionality

• A-rated efficiency

• 12-year warranty currently advertised by iHeat for the 26kW model

Points to consider

The 100-W is deeper than the 050-W currently listed by iHeat, at 350mm compared with 300mm.

Installation space should therefore be checked rather than assuming the two boilers have identical dimensions.

As a combi, its suitability also depends on the property's hot water requirements.

Viessmann Vitodens 100-W 32kW system boiler

The Vitodens 100-W 32kW system boiler is different from the two combis above because it works with a separate hot water cylinder.

The model currently listed by iHeat measures 400mm wide, 700mm high and 360mm deep.

A system boiler can be appropriate where storing hot water is preferable to producing all domestic hot water instantaneously through a combi.

Who could the Vitodens 100-W system boiler suit?

The 32kW system model may be more appropriate for properties with greater hot water requirements or where a suitable hot water cylinder is already installed.

Stored hot water can be useful where hot water may be required at more than one outlet.

However, a system boiler also requires space for the cylinder, so it is not automatically the best option for every larger property.

Advantages of the Vitodens 100-W system boiler

• Designed to work with a separate hot water cylinder

• Can support homes where stored hot water is preferable

• Part of the current Vitodens 100-W range

• Stainless steel heat exchanger technology

• Connected heating functionality

• A-rated condensing technology

Points to consider

A system boiler requires a separate hot water cylinder, so the complete heating system needs more space than a combi installation.

If you are replacing an existing combi, changing to a system boiler is also a more substantial system change than a straightforward combi replacement.

Vitodens 050-W vs 100-W: what's the difference?

For iHeat customers comparing the current combi options, the main choice is between the 050-W 25kW and 100-W 26kW.

Both are compact wall-mounted gas condensing combis, and both use Viessmann's stainless steel heat exchanger technology.

The 050-W is positioned as the more affordable entry into the current range and has a shallower 300mm depth.

The 100-W sits further up the Vitodens range, incorporates connected heating functionality and currently comes with a 12-year warranty through iHeat.

The better option therefore depends on more than the 1kW difference between their headline outputs.

Combi vs system: which Vitodens type do you need?

A combi boiler provides central heating and heats domestic hot water when you need it. There is no separate hot water cylinder.

That can make a combi attractive where space is limited and hot water demand is compatible with the boiler.

A system boiler heats water for storage in a separate cylinder. This arrangement can be more appropriate where stored hot water is required or household demand makes a cylinder-based system preferable.

If your existing heating system already uses a cylinder, replacing it with another suitable system boiler may also involve fewer fundamental changes than converting the property to a combi.

What size Viessmann boiler do you need?

Boiler output is measured in kilowatts, but selecting a boiler should not be based on one number alone.

Factors that can affect the required boiler include:

• the property's heat loss

• number and size of radiators

• insulation levels

• hot water demand

• number of bathrooms

• whether hot water is regularly required simultaneously

• whether the property uses a hot water cylinder

• the design of the existing heating system

Bedroom and bathroom counts can be useful starting points, but they are not a substitute for correctly assessing the heating system.

Choosing the largest available boiler does not automatically improve performance.

How efficient are Viessmann Vitodens boilers?

The current Vitodens models are condensing boilers designed to recover heat that would otherwise leave through the flue.

The 050-W and 100-W are A-rated products, although exact efficiency figures depend on the particular model and operating conditions.

Real household gas use will also depend on factors beyond the boiler itself, including insulation, heating controls, flow temperature, hot water use and how the household heats the property.

A boiler's efficiency figure should therefore not be treated as a guarantee of a particular reduction in energy bills.

What controls are available with Vitodens boilers?

Modern Vitodens boilers support Viessmann's connected heating technology.

Compatible controls can provide more convenient management of the heating system, while connected functionality can allow heating to be monitored and adjusted through Viessmann's digital platform where the installation supports it.

The exact controls included or compatible with an installation should be checked for the boiler and heating system being fitted.

What warranty comes with a Viessmann Vitodens boiler?

Warranty cover depends on the model, installation and applicable terms.

iHeat currently advertises a 12-year warranty on the Vitodens 100-W 26kW combi.

Do not assume the same warranty automatically applies to every Vitodens model. Check the warranty stated for the specific boiler when ordering and ensure any registration and servicing requirements are understood.

What about other Viessmann Vitodens models?

Viessmann manufactures other boilers within the wider Vitodens family, but this guide focuses on models currently listed through iHeat.

A model being available from Viessmann does not necessarily mean it is currently supplied by iHeat.

For example, older versions of this guide discussed the Vitodens 111-W in detail. It is not currently listed on iHeat's main Viessmann boiler range page, so it should not be presented here as a current iHeat option.

How much do Viessmann Vitodens boilers cost?

Price varies according to the boiler, installation and any additional work required.

Rather than duplicating detailed pricing and installation information here, see our full guide to Viessmann combi boiler costs, which covers boiler prices, installation and factors that can affect the final quote.

For current products and live iHeat pricing, you can also view current Viessmann boilers and prices.

Which Viessmann Vitodens boiler is right for me?

If you want a compact Viessmann combi, the current 050-W 25kW is the entry point into iHeat's Vitodens range.

The 100-W 26kW combi is the alternative for homeowners considering the additional features and positioning of the 100-W range.

If your property is better suited to stored hot water, the 100-W 32kW system boiler provides a cylinder-based alternative within iHeat's current Viessmann offering.

The final decision should be based on the property's calculated heating requirements, hot water demand and existing system rather than choosing a model purely by output, price or the number of bedrooms.