GET A COMPETITIVE QUOTE

Please enter your postcode below to get a free, no obligation, personalised quotation from PlumbProud

Vaillant EcoTEC Exclusive IQ 835 boiler

  1. Home
  2. Vaillant ecoTEC Exclusive IQ 835
Plumbproud rating

91.90%

Vaillant ecoTEC Exclusive IQ 835 Combi Gas boiler

We have determined a rating of 91.90% for this Vaillant ecoTEC Exclusive IQ 835 Combi boiler using the PlumbProud quality benchmarking system. Factors used to score a boiler include its energy performance, how much it costs to run, the installation price, and how long the manufacturer's guarantee lasts.

On a standard fit, we would expect this Vaillant ecoTEC Exclusive IQ 835 Combi boiler to cost you £2,600 supplied and fully installed by an experienced Gas Safe PlumbProud fitter.

For advice on whether this Vaillant ecoTEC Exclusive IQ 835 Combi boiler is suitable for your home or to receive a free quotation on theVaillant Vaillant EcoTEC Exclusive IQ 835, please call 01604 343053 to speak to one of our team. Alternatively, click here to email us or enter your postcode into the quotation box on this page.


Installed price around

£2,600

GET A COMPETITIVE BOILER QUOTE

Please enter your postcode below to get a personalised quotation for the perfect boiler for your home

Vaillant ecoTEC Exclusive IQ 835 Combi Gas boiler frequently asked questions

Is this Vaillant EcoTEC Exclusive IQ 835 boiler a combi, system or regular boiler?

When looking for a combi boiler for your house or flat, the Vaillant EcoTEC Exclusive IQ 835 might be a suitable option for you.

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.

Would the Vaillant EcoTEC Exclusive IQ 835 combi be a suitable boiler for my house or flat?

To determine that, we need to consider the size of the boiler. Size doesn't mean how big it is - it means how big its "output" is.

Your boiler's output indicates the maximum amount of power available to it to heat the water you need to warm your radiators or when you want hot water from your taps. A higher output rate means that your boiler is capable of heating greater volumes of water.

If a boiler's output rate is too low, you'll often find that the water is not as hot as you want it to be. Too high, however, and you'll end up paying more for your gas than you should be.

The Vaillant EcoTEC Exclusive IQ 835 combi boiler has an output rate of 35 kW, so which types of property would this be suitable for?

To most experienced Gas Safe boiler installers, the Vaillant EcoTEC Exclusive IQ 835 combi EcoTEC Exclusive IQ would be most suitable for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

Homeowners considering fitting a combi boiler to their home need to consider flow rates as well as output rates.

The flow rate is a measurement of the volume of water a combi can instantly heat and send to the taps and radiators around your home. The higher the likely demand for hot water in your home, the higher your combi's flow rate should be. This Vaillant ecoTEC Exclusive IQ 835 Combi boiler's flow rate is 15 L/m.

Unlike heat only or system boilers, combi boilers don't store hot water in a tank for later use - instead, they draw it directly from the mains. This means that the volume of water your boiler can actually process is constrained by the flow rate of water in the mains pipe.

So, if you choose a combi boiler with a 15l/m flow rate but the flow rate in your mains pipe is 12l/m, the combi boiler's working flow rate is also 12l/m.

Combi boilers are also not always the correct choice for homes with multiple bathrooms, a high number of radiators, or where more than one family member will want to use hot water at the same time.

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.


How large is a Vaillant EcoTEC Exclusive IQ 835 boiler?

The Vaillant EcoTEC Exclusive IQ 835 stands at 720 mm tall, 440 mm wide and 406 mm deep.

Is the Vaillant EcoTEC Exclusive IQ 835 condensing or non-condensing?

We recommend that, if possible, you choose a condensing boiler like the Vaillant EcoTEC Exclusive IQ 835.

Condensing boilers are more energy-efficient. They achieve this efficiency by capturing the heat present in flue exhaust gases and water vapour condensation and recycling that heat to, for example, warm colder water coming back from your radiators.

By choosing the latest condensing boiler, you'll also notice a significant reduction in your gas bills, particularly if you're replacing a boiler more than 15 years old.

Is the Vaillant EcoTEC Exclusive IQ 835 combi an energy-efficient boiler?

Environmentally-friendly heating has become an important issue for homeowners concerned about the accelerating pace of climate change.

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.

Would choosing the Vaillant EcoTEC Exclusive IQ 835 combi help the environment? Let's see what the statistics suggest.

In the UK, by law, all boilers manufactured since April 2018 must have a SEDBUK “A” rating and operate to a minimum level of 92% energy efficiency. Prior to this, the minimum was 88% – 88/89% would score a "B" and 90% or more an "A" on the SEDBUK scale.

The energy efficiency rating measures the amount of energy a boiler consumes when it's in use and how much it loses on non-core operations.

Following testing, the Vaillant EcoTEC Exclusive IQ 835 was given an efficiency rating of 94% and a SEDBUK grading of "A".

The Energy Related Products Directive intends to encourage all manufacturers to reduce the harmful gas emissions associated with the products they make, from the manufacturing stage to final disposal, including when they are in active use.

The Vaillant EcoTEC Exclusive IQ 835 has an ERP rating of "A" for heat and "A" for hot water.

How long is the warranty offered by the manufacturer for the Vaillant EcoTEC Exclusive IQ 835 boiler?

Parts and labour charges incurred during a repair on the Vaillant Vaillant EcoTEC Exclusive IQ 835 boiler are covered by a 5 year warranty.


Vaillant ecoTEC Exclusive IQ 835 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
Height720 mm
Width440 mm
Depth406 mm
MountingWall
Flow rate15 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%

Combi boilers

Choose from the UK’s biggest range of combis

Heat only boilers

The ideal boiler perfect for the largest homes

System boilers

Ideal for 3+ bedroom, 2+ bathroom homes

Boiler quote

Free, no obligation quote from our engineer

Vaillant EcoTEC Exclusive IQ 835 boiler

We will not be beaten on price -
ask us about our PRICE GUARANTEE!

Vaillant ecoTEC Exclusive IQ 835 Combi Gas boiler

  1. Home
  2. Vaillant ecoTEC Exclusive IQ 835
Plumbproud rating for this boiler
91.90%

Using factors such as price installed, manufacturer guarantees, energy efficiency and the likely cost of running, among others, this model has been rated as scoring 91.90% on the PlumbProud boiler benchmarking system.

We estimate that, on a standard, non-complicated installation, the supply and fitting charge for this Vaillant ecoTEC Exclusive IQ 835 Combi boiler will be around £2,600.

For advice on whether this Vaillant ecoTEC Exclusive IQ 835 Combi boiler is suitable for your home or to receive a free quotation on theVaillant Vaillant EcoTEC Exclusive IQ 835, please call 01604 343053 to speak to one of our team. Alternatively, click here to email us or enter your postcode into the quotation box on this page.


Installed price guideline
£2,600

Get your free quote

Vaillant ecoTEC Exclusive IQ 835 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
Height720 mm
Width440 mm
Depth406 mm
MountingWall
Flow rate15 L/m
ERP HeatA
ERP WaterA

Vaillant ecoTEC Exclusive IQ 835 Combi Gas boiler frequently asked questions

What kind of boiler is the Vaillant EcoTEC Exclusive IQ 835 - standard, combi or system?

When looking for a combi boiler for your house or flat, the Vaillant EcoTEC Exclusive IQ 835 might be a suitable option for you.

One of the reasons the combi boiler was introduced to Britain in the 1970s was because residential properties are among the smallest in the world. More traditional boilers require one or more large tanks to be stored around the home to function.

A combi boiler is a self-contained unit that draws water from the mains then heats and distributes it instantly and on demand - no tanks are needed.

They are the most popular type of boilers in the UK and offer only one major disadvantage - there is a maximum volume of water that can be heated at any one time. If that limit is exceeded by, for example, two people using a hot water tap at the same time, there will be a drop in water pressure, temperature and volume to both taps.

Is a Vaillant EcoTEC Exclusive IQ 835 combi boiler appropriate for my house or apartment?

Whether this Vaillant ecoTEC Exclusive IQ 835 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 Vaillant EcoTEC Exclusive IQ 835 combi is 35 kW, so which types of property would this model be appropriate for?

Most Gas Safe boiler installers would recommend that a boiler with this output level would be most suitable for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

In addition to output rates, you need to consider a combi boiler's flow rate when making your choice.

The flow rate of your boiler dictates the maximum volume of water (measured in litres per minute) that it can heat and distribute to your taps, showers and radiators at any one time.

However, a combi boiler like the Vaillant EcoTEC Exclusive IQ 835 can only heat and deliver water at the rate at which it actually enters your property. For this reason, you should also find out what the mains pressure to your house is before purchasing a boiler.

It's pointless spending more money on a boiler with a 17l/m flow rate if the local water pressure is 11l/m. To give you an indication of average water demand, a power shower typically requires 12 litres of water per minute and a basin tap 4-8 litres. This Vaillant ecoTEC Exclusive IQ 835 Combi boiler's flow rate is 15 L/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.


The size of the Vaillant EcoTEC Exclusive IQ 835 in millimetres

The Vaillant EcoTEC Exclusive IQ 835 measures 720 mm in height and has a width of 440 mm and a depth of 406 mm.

Is the Vaillant EcoTEC Exclusive IQ 835 non-condensing or condensing?

Condensing gas boilers like the Vaillant EcoTEC Exclusive IQ 835 are more energy-efficient and choosing one for your home will cut the amount you pay every year for your gas.

They do this by capturing the heat in water vapour condensation and in exhaust gases which would normally be expelled via the flue. They then recycle that heat, returning it to the system to, among other tasks, reheat colder water that is returning to your boiler from your radiators.

How energy efficient is the Vaillant EcoTEC Exclusive IQ 835 combi?

As more of us become concerned by the effects of climate change, the damage we do to the environment by heating our homes has emerged as an important issue for many homeowners.

14% of the UK’s greenhouse gas production comes from central heating. In the bigger cities, gas boilers in particular are responsible for dangerous levels of nitrogen dioxide emissions.

Would installing a Vaillant EcoTEC Exclusive IQ 835 combi boiler in your home be a green choice? Let's look at the numbers.

By law, the minimum level of energy efficiency for boilers manufactured in the UK is 92%, equivalent to a good SEDBUK “A” rating. Prior to April 2018, the minimum was 88% - boilers whose energy efficiency levels were 88% or 89% were given a "B" rating on the SEDBUK scale and those at 90% or higher were given an "A".

The energy efficiency rating awarded to each boiler indicates the amount of energy that is wasted when in operation.

Following testing, the Vaillant EcoTEC Exclusive IQ 835 was given a 94% energy efficiency rating and a SEDBUK grading of "A".

The Energy Related Products Directive, also known as ERP, is European legislation that intends to reduce energy consumption related to products right from the initial manufacturing process through to eventual final disposal.

The purpose of the directive is to encourage manufacturers to create new products that are kinder to the environment and which result in lower overall harmful gas emissions through a product's entire life cycle.

The Vaillant EcoTEC Exclusive IQ 835 has a rating of "A" for heat and "A" for water.

How long is the warranty period on the Vaillant EcoTEC Exclusive IQ 835 combi boiler?

The Vaillant EcoTEC Exclusive IQ 835 is covered by a parts and labour warranty of 5 years following 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%
Menu