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Viessmann Vitodens 100 W 35kW boiler

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Plumbproud rating

90.28%

Viessmann Vitodens 100-W 35kW Combi Gas boiler

This Viessmann Vitodens 100-W 35kW Combi boiler has been rated at 90.28%. Our PlumbProud boiler quality rating system uses price installed, energy efficiency, likely running costs, the manufacturer's warranty and other factors to determine the rating we give.

You should budget approximately £2,400 for the supply and installation of this Viessmann Vitodens 100-W 35kW Combi boiler on a standard, non-complicated fit.

Get a free quote on the Viessmann Vitodens 100-W 35kW boiler and advice on whether this is the right choice for your home by entering your postcode in the quote box on this page, clicking here to email us, or giving us a call at 01604 343053.


Installed price around

£2,400

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Viessmann Vitodens 100-W 35kW Combi Gas boiler frequently asked questions

Is the Viessmann Vitodens 100-W 35kW boiler a combi, regular or a system boiler?

The Viessmann Vitodens 100-W 35kW boiler could be suitable for your house or flat if you are looking for a new combi boiler.

Traditional boilers have one or two tanks - one holds hot water to keep it warm and the other water for later heating. Because UK residential property is among some of the smallest in the world, manufacturers introduced combi boilers and the heat pumps that go in them in the 1970s to reduce the amount of space boilers needed to take up.

The hot water needed for your radiators and taps is available on demand when you have a combi boiler. Combi boilers use technology located within the boiler to heat cold water, which it draws from the mains, and to distribute hot water where it's needed around your home.

A combi boiler, however, has the disadvantage of a maximum capacity for the amount of water it can heat. The result is that if someone uses the shower while another uses a hot water tap simultaneously, the amount of water reaching each point falls, causing water pressure to drop.

Should I install a Viessmann Vitodens 100-W 35kW combi boiler in my house or flat?

Whether this Viessmann Vitodens 100-W 35kW Combi boiler is right for where you live depends on its size or "output" level. Size does not mean its physical dimensions - it means how powerful it is.

The output level of a boiler tells you how much power it has to heat the water coming from your taps and warming up your radiators. The higher the output level, the greater the volume of water it can heat up.

If the output (measured in kilowatts) is too high, you'll pay higher gas bills and your water will be piping hot. Too low and the water coming out of your taps and being fed into your radiators will often be lukewarm.

The Viessmann Vitodens 100-W 35kW combi outputs at a maximum of 35 kW, so which types of property would this Viessmann Vitodens 100-W 35kW Combi boiler be appropriate for?

A PlumbProud heating engineer would recommend that this Viessmann Vitodens 100-W 35kW Combi boiler be installed in larger properties including detached homes with 15 or more radiators and two or more bathrooms.

Flow rates are important when choosing a combi boiler as well as output rates.

A combi boiler's flow rate (measured in litres per minute) describes how much water it can instantly heat then distribute to the taps and radiators in your home - you will need to factor this into your decision on a new combi boiler. This Viessmann Vitodens 100-W 35kW Combi boiler's flow rate is 17 L/m.

If you have a lot of radiators and bathrooms in your home and there's lots of demand within your household for hot water at the same time (like morning or evening showers and baths), you'll need a boiler with a high flow rate.

However, it's not quite that simple. If your local mains water pressure is low, you're not going to gain any benefit from choosing a combi boiler with a high flow rate because that higher flow rate doesn't mean it can draw more water from the mains pipes.
When our engineer comes out to quote you, they may recommend that you choose a heat only boiler or system boiler instead if your family's demand for hot water is higher than normal.


Viessmann Vitodens 100-W 35kW - size in millimetres

The Viessmann Vitodens 100-W 35kW measures 455 mm in height and has a width of 595 mm and a depth of 800 mm.

Is this Viessmann boiler condensing or non-condensing?

Because of their increased energy efficiency, we recommend to all customers that they select one of the latest condensing boilers. Condensing boilers capture the heat from water vapour condensation and flue exhaust gases and recycle that heat to warm water entering the boiler (for example, from your radiators).

The Viessmann Vitodens 100-W 35kW is a condensing gas boiler and choosing this model will result in a likely substantial reduction in your fuel bills, particularly if you're replacing an older, inefficient, non-condensing boiler.

Is the Viessmann Vitodens 100-W 35kW combi boiler good for the environment?

As more of us are increasingly concerned about climate change, how we heat our homes and its impact on the environment has become an issue of importance to homeowners.

Nitrogen dioxide emissions in Britain's largest cities are at dangerous levels and this has been caused by gas boilers. In fact, 14% of the UK’s greenhouse gases are produced by central heating.

If you decide to install a Viessmann Vitodens 100-W 35kW combi in your home, will you be helping the environment with your choice? Let’s have a look at the figures.

Boilers manufactured and installed in the UK are assigned energy efficiency ratings following testing to an agreed set of standards. These scores indicate how much energy the boiler uses and how much goes to waste when it's in operation.

By law, boilers must achieve a SEDBUK rating of "A" subject to achieving a minimum of 92% energy efficiency. Prior to April 2018, the minimum was 88% (88% and 89% on the SEDBUK are graded "B" and 90% and above is graded "A").

The Viessmann Vitodens 100-W 35kW was awarded an efficiency rating of 94% with a SEDBUK band rating of "A".

The Energy Related Products Directive (ERP) was introduced in 2015 and it applies to all products that consume energy throughout their lifetime, including during the manufacturing process and at the point of final disposal.

The purpose of the ERP is to ensure that companies create products that are kinder to the environment by reducing both the energy they use and the harmful emissions they produce.

The Viessmann Vitodens 100-W 35kW has an ERP rating of "A" for heat and "A" for hot water production.

How long is the warranty offered by the manufacturer for the Viessmann Vitodens 100-W 35kW boiler?

The Viessmann Vitodens 100-W 35kW boiler is provided with a parts and labour warranty lasting 5 years.


Viessmann Vitodens 100-W 35kW Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?Yes
P/L Warranty5 Years
Output in kW35 kW
Height455 mm
Width595 mm
Depth800 mm
MountingWall
Flow rate17 L/m
ERP HeatA
ERP WaterA

The top 10 rated Gas Combi boilers

Using the Plumbproud scoring system, the current 10 ten Gas Combi boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 82593.35%
2Vaillant ecoTEC Plus 83292.98%
3Worcester Bosch Greenstar 2000 25kW92.89%
4Viessmann Vitodens 050-W 29kW92.66%
5Vaillant ecoTEC Plus 83592.60%
6Worcester Bosch Greenstar CDi Compact 2892.57%
7Vaillant ecoFIT Pure 82592.39%
8Vaillant ecoTEC Plus 83892.16%
9Vaillant ecoTEC Exclusive IQ 83591.90%
10Vaillant ecoTEC Pro 2491.77%

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The ideal boiler perfect for the largest homes

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Viessmann Vitodens 100 W 35kW boiler

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Viessmann Vitodens 100-W 35kW Combi Gas boiler

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  2. Viessmann Vitodens 100-W 35kW
Plumbproud rating for this boiler
90.28%

Assessing factors including the system's running costs, its energy efficiency, the manufacturer’s guarantee, and its likely installed price, we scored this Viessmann Vitodens 100-W 35kW Combi boiler 90.28% on our internal PlumbProud grading system.

We would expect this Viessmann Vitodens 100-W 35kW Combi boiler to cost £2,400 fully installed through PlumbProud, although it will cost more if the fit is complicated. We will provide you with a full quote before starting work, however.

Enter your postcode in the box provided and receive a free quote for the Viessmann Vitodens 100-W 35kW boiler for your home. We are also happy to answer any questions you might have about any of our boilers. You can do this by emailing the team or calling us today on 01604 343053.


Installed price guideline
£2,400

Get your free quote

Viessmann Vitodens 100-W 35kW Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?Yes
P/L Warranty5 Years
Output in kW35 kW
Height455 mm
Width595 mm
Depth800 mm
MountingWall
Flow rate17 L/m
ERP HeatA
ERP WaterA

Viessmann Vitodens 100-W 35kW Combi Gas boiler frequently asked questions

Is the Viessmann Vitodens 100-W 35kW a system boiler, a combi boiler or a regular boiler?

The Viessmann Vitodens 100-W 35kW may be worth considering if you are looking for a combi boiler for your house or flat.

A combi boiler could be a better choice than a standard boiler if space is at a premium in your home. Combi boilers draw water directly from the mains supply and heat it instantly, removing the need for a hot water cylinder and a cold water tank.

Water is heated on demand and then distributed directly to your taps and showers. This means that combi boilers use less fuel and so reduce your gas bills.

The main disadvantage to combi boilers is that they can only heat a limited volume of water at any given time. If more than one tap or shower is in use, the hot water supply to both could be restricted and both the water pressure and temperature will drop.

Is the Viessmann Vitodens 100-W 35kW combi boiler suitable for my house or apartment?

Selecting the right boiler for your home means choosing a boiler that is the right size. And, by size, we don't mean how big it is, we mean how powerful it is - the "output".

Your boiler’s output is a measurement of the power it has available to it to heat the water you need for your radiators or for when you turn on a tap, bath or shower. A higher output rate means it has more power and can heat more water.

It's important to choose an output that matches the demand for water in your home because if your boiler has too low an output, you'll often find only lukewarm water comes out of your taps or heats your radiators. If it’s too high, you’ll be paying more for your gas than you need to.

The Viessmann Vitodens 100-W 35kW combi has an output of 35 kW, so which types of property would this Viessmann Vitodens 100-W 35kW Combi boiler be appropriate for?

An experienced PlumbProud Gas Safe boiler installer would likely recommend that this Viessmann Vitodens 100-W 35kW Combi boiler would be suitable for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

You also need to choose a combi boiler with the right flow rate for where you live.

A combi boiler's flow rate is the maximum volume of water (measured in litres per minute) that it can heat and distribute to your radiators, taps and showers at the same time. This Viessmann Vitodens 100-W 35kW Combi boiler's flow rate is 17 L/m.

However, combi boilers like the Viessmann Vitodens 100-W 35kW draw water directly from the mains and heat it instantly.

If your mains pressure is 12 litres per minute, your boiler can only heat and distribute hot water at a rate of 12 litres per minute even if it has a higher flow rate.

Combi boilers also struggle when multiple people in your home want to use hot water at the same time - for example, someone running the hot water tap in the kitchen and two people wanting to shower in separate bathrooms.

When our engineer comes out to quote you, they may recommend that you choose a heat only boiler or system boiler instead if your family's demand for hot water is higher than normal.


What size is the Viessmann Vitodens 100-W 35kW boiler?

The Viessmann Vitodens 100-W 35kW has the following dimensions - 455 mm high, 595 mm wide, and 800 mm deep.

Is the Viessmann Vitodens 100-W 35kW non-condensing or condensing?

Condensing boilers like the Viessmann Vitodens 100-W 35kW improve energy efficiency and reduce your annual expenditure on gas.

They do this by capturing and recycling the warmth still present in water vapour condensation and flue exhaust gases to, for example, increase the temperature of the colder water returning from your radiators.

Condensing boilers are also much better for the environment because they emit fewer greenhouse gases.

Is the Viessmann Vitodens 100-W 35kW combi good for the environment?

How we heat our homes and the damage this does to the environment has become a pressing concern for many homeowners worried about the effects and impact of climate change.

About 14% of the greenhouse gases we produce in the UK come from the power needed for central heating. In bigger British cities, gas boilers are a significant source of nitrogen dioxide emissions.

Would the environmental impact of installing a Viessmann Vitodens 100-W 35kW combi in your home be positive? Let's look at the numbers.

By law, boilers manufactured and supplied in the UK must achieve a SEDBUK rating of "A" and work at a 92% minimum efficiency. Before April 2018, a minimum of 88% energy efficiency needed to be achieved (88/89% = SEDBUK "B" and 90% = SEDBUK "A").

Following official testing, the Viessmann Vitodens 100-W 35kW was given an efficiency rating of 94% with a SEDBUK rating of "A".

Energy efficiency is a measure of how much energy is used and how much is wasted when a boiler is operating.

In 2015, new legislation was introduced by the EU to encourage manufacturers to develop more energy-efficient products that emit fewer harmful gases throughout their lifetime.

The Energy Related Products Directive (ERP) applies to all products that consume energy, including during the manufacturing process, at the point of final disposal, and all points in between.

The ERP rating of the Viessmann Vitodens 100-W 35kW is "A" for heat and "A" for hot water.

Am I covered if the Viessmann Vitodens 100-W 35kW combi boiler breaks down?

On the Viessmann Vitodens 100-W 35kW, the manufacturer offers a parts and labour warranty of 5 years.


The top 10 rated Gas Combi boilers

Using the Plumbproud scoring system, the current 10 ten Gas Combi boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 82593.35%
2Vaillant ecoTEC Plus 83292.98%
3Worcester Bosch Greenstar 2000 25kW92.89%
4Viessmann Vitodens 050-W 29kW92.66%
5Vaillant ecoTEC Plus 83592.60%
6Worcester Bosch Greenstar CDi Compact 2892.57%
7Vaillant ecoFIT Pure 82592.39%
8Vaillant ecoTEC Plus 83892.16%
9Vaillant ecoTEC Exclusive IQ 83591.90%
10Vaillant ecoTEC Pro 2491.77%
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