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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

We score each boiler we sell by considering a number of different factors including price installed, manufacturer guarantees, energy efficiency, the likely cost of running, and more. For this Viessmann Vitodens 100-W 35kW Combi boiler, we have awarded a rating of 90.28%.

This Viessmann Vitodens 100-W 35kW Combi boiler is likely to cost you £2,400 supplied and fully installed through PlumbProud, although there may be additional charges if the fit takes longer than anticipated. You will, however, receive a binding quote from us prior to starting work.

Please enter your postcode in the quote boxes on this page, email us, or call us on 01604 343053 to get a free quote and guidance on whether the Viessmann Vitodens 100-W 35kW boiler is the right choice for your home.


Installed price around

£2,400

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

What type of boiler is the Viessmann Vitodens 100-W 35kW - regular, system or combi?

The Viessmann Vitodens 100-W 35kW is a combi boiler you may wish to consider if you want this particular type of boiler for your house or flat.

The UK has some of the smallest homes in the Western world, which is partly why combi boilers were introduced in the 1970s. Traditional boilers require one or more large storage tanks which they use to either heat water and keep it warm or store water intended for heating later. These tanks took up a lot of space in people's homes.

Combi boilers save space because they don't require these tanks to operate. Instead, combis draw water direct from your mains supply then instantly heat and distribute it on demand.

The biggest disadvantage in using combi boilers is that they have a maximum capacity volume for heating water. While this may not be an issue in a small household, it could be for a larger household where there is higher demand for hot water. When more than one person is using the water, it is distributed between the two points, reducing the pressure and temperature at each point.

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

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

The output of a boiler is measured in kilowatts and indicates how much energy it can use to heat the water needed for your radiators, taps and showers. The greater the output, the more water it can heat.

A boiler whose output is too high will give you hot water and warm radiators but also higher gas bills, whereas a boiler whose output is too low will result in cheaper gas bills but the water might not always be as hot as you want it to be.

The output of the Viessmann Vitodens 100-W 35kW combi is 35 kW, so which types of property would this model be appropriate for?

An experienced Gas Safe boiler installer would be likely to recommend that this Viessmann Vitodens 100-W 35kW Combi boiler is capable of providing heating and hot water to 15 or more radiators and two or more bathrooms and would therefore be most suitable for larger properties including detached homes.

With combi boilers, you need to consider the flow rate as well as the output rate. The flow rate (shown in litres per minute) measures how much water your boiler can draw from the mains which it then instantly heats and distributes to your taps and radiators.

However, a high flow rate is of little to no value if your local water pressure is low. If your local mains water pressure is 10l/m and your flow rate is 12l/m, your boiler will only be able to process 10l/m.

If you live in an area with high water pressure but your household has multiple bathrooms and/or radiators and many members of your household want to use hot water at the same time (like morning or evening baths or showers), it's unlikely that you'll be able to find a combi with a high enough flow rate.

As an indication, a power shower needs about 10 litres of water per minute, whereas the flow rate of this Viessmann Vitodens 100-W 35kW Combi boiler is 17 L/ml/m.

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.


Making space for the Viessmann Vitodens 100-W 35kW

The dimensions of the Viessmann Vitodens 100-W 35kW are 455 mm tall, 595 mm wide, and 800 mm deep.

Viessmann Vitodens 100-W 35kW – condensing or non-condensing?

The Viessmann Vitodens 100-W 35kW is a condensing boiler – we recommend to all clients that they choose the very latest condensing boilers because their efficiency continues to improve year after year.

Condensing boilers recycle heat from both water vapour condensation and flue exhaust gases via a secondary heat exchanger. With this heat, it performs other tasks like warming up colder water returning from your radiator without having to use more gas.

You will save money on your gas bills every year by choosing a condensing boiler as well as benefitting the environment.

Does the Viessmann Vitodens 100-W 35kW combi protect the environment?

With growing concern among the public about accelerating climate change, how we heat our homes and the impact this has on the environment has become a major topic of concern for many homeowners.

The heating of our homes accounts for 14% of the UK's greenhouse gas emissions. Especially in the big cities, gas boilers are responsible for dangerous levels of nitrogen dioxide emissions.

Is the Viessmann Vitodens 100-W 35kW combi boiler an environmentally friendly choice for your home? Here’s what the figures say.

All new British boilers must perform to a legal minimum energy efficiency of 92% (a low to good SEDBUK "A" rating). Prior to April 2018, the target was 88% (86-90% = SEDBUK "B" and 90%+ = SEDBUK "A").

Efficiency ratings are intended to let consumers know how much energy a boiler uses in its day-to-day activities and how much energy goes to waste.

The Viessmann Vitodens 100-W 35kW was awarded an efficiency rating of 94%, equivalent to a SEDBUK grade of "A".

The ERP, short for the Energy Related Products Directive, is a European directive aimed at encouraging manufacturers to create products that are environmentally friendlier at all stages, including during manufacturing, when the product is in active use, right through to the point of final disposal.

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

Is there a warranty on the Viessmann Vitodens 100-W 35kW combi boiler if it breaks down?

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

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

We score this Viessmann Vitodens 100-W 35kW Combi boiler as 90.28% on the PlumbProud quality scoring system. Our rating is based on various factors, including the installation price, the length of the manufacturer's warranty, and the expected energy efficiency and operating costs.

Expect this Viessmann Vitodens 100-W 35kW Combi boiler to cost you £2,400 fully installed where there are no complications on the fit if you choose PlumbProud for this installation.

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 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 boiler a standard, combi or system model?

The Viessmann Vitodens 100-W 35kW is an option you may wish to consider if you’re looking for a combi boiler for your house or flat.

Traditional boilers need one or more large tanks to work - one to heat and keep water warm for immediate use and the other to store water intended for heating later. Finding space for these large tanks is difficult in British residential property - remember that our houses and flats are among the smallest in the world. This is the problem that combi boilers were designed to solve when they were introduced in the 1970s.

Combi boilers don't need a tank - instead, they instantly heat water drawn from the mains using technology inside the boiler. This hot water is then distributed immediately to your taps or radiators on demand.

The biggest disadvantage to combi boilers is that they have a maximum capacity for heating water, meaning that they work best when only one point within a household wants hot water. For example, if someone is taking a shower and another person uses a hot water tap at the same time, the water pressure, volume and temperature to both points drops.

Should I install a Viessmann Vitodens 100-W 35kW combi boiler in 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 need to consider the flow rate as well as the output rate when choosing a combi boiler.

Flow rates, measured in litres per minute, indicate how much water your boiler can heat and distribute around your home at any given time. If your family regularly use hot water around the house at the same time and you have a lot of radiators, you should choose a boiler with a high flow rate. This Viessmann Vitodens 100-W 35kW Combi boiler's flow rate is 17 L/m.

However, you also need to consider the flow rate of your local mains water supply. Combis can only draw water from the mains as fast as the pipes can deliver it. If you choose a boiler with a 14l/m flow rate and the mains pipes into your home have a flow rate of 12l/m, your boiler won't be able to operate at full capacity. In other words, try to make sure the local water pressure and your boiler flow rates are as close as possible.

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 dimensions

The Viessmann Vitodens 100-W 35kW occupies a space of 455 mm high by 595 mm wide and 800 mm deep.

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

We recommend that you select a condensing boiler like the Viessmann Vitodens 100-W gas Viessmann Vitodens 100-W 35kW for your home if possible because of the environmental benefits and the money you'll save on your gas bills.

Condensing boilers are much more energy-efficient than older, non-condensing models as they capture and recycle the heat still present in the water vapour condensation and flue exhaust gases that your boiler creates when burning gas for reuse.

Is the Viessmann Vitodens 100-W 35kW combi boiler an environmentally friendly choice?

With more and more people concerned about climate change, how we heat our homes and the damage it does to the environment is increasingly being questioned by British 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.

Would choosing a Viessmann Vitodens 100-W 35kW combi help in the fight against climate change? What do the performance statistics suggest?

All boilers manufactured in the UK from April 2018 must achieve a SEDBUK “A” grade and an energy efficiency rating of 92% or above. Before that, the minimum was 88% - efficiency ratings of 88% and 89% were scored a “B” and 90%+ an "A".

A boiler's energy efficiency rating describes how much energy it uses and wastes during its standard operation.

The energy efficiency of the Viessmann Vitodens 100-W 35kW was rated at 94% with a SEDBUK grading of "A".

The ERP, short for the Energy Related Products Directive, is a European directive aimed at encouraging manufacturers to create products that are environmentally friendlier at all stages, including during manufacturing, when the product is in active use, right through to the point of final disposal.

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

Does the Viessmann Vitodens 100-W 35kW combi boiler come with a warranty?

The Viessmann Vitodens 100-W 35kW boiler has a warranty covering parts and labour costs for up to 5 years after installation.


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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