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 awarded this Vaillant ecoTEC Exclusive IQ 835 Combi boiler a rating of 91.90% in our boiler quality benchmark tests. To determine a score for each boiler, we factor in several different points of comparison including energy efficiency, manufacturer guarantees, estimated running costs, price and more.

On most non-complicated installations, we would expect this Vaillant ecoTEC Exclusive IQ 835 Combi boiler to cost £2,600 supplied and fully professionally installed.

For a free quote on the Vaillant EcoTEC Exclusive IQ 835 boiler and to get professional advice and guidance on whether it is the right choice for your home, please enter your postcode in the quote boxes on this page, click here to email us, or call us on 01604 343053.


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

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

The Vaillant EcoTEC Exclusive IQ 835 is worthy of consideration if you're looking for a combi boiler for your flat or house.

Traditional boilers have one or more large tanks in which they store either heated water or water to be heated later. Manufacturers originally introduced combi boilers to the market in the 1970s to enable homeowners to save space - UK residential properties are among the smallest in the Western world.

Combi boilers don't need these tanks because they draw water directly from the mains and instantly heat it on demand thanks to the technology inside the boiler. Combi boilers then distribute this hot water to your home’s taps and radiators when needed.

The most significant disadvantage of combi boilers is that they are not ideal in larger homes where multiple people might want hot water at the same time – for example, if someone is having a shower while another wants to wash dishes in the kitchen. This is because combi boilers have a maximum volume of water that they can heat. When two people want hot water at the same time, the water temperature, pressure and volume delivered to both points drop.

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 "output" level. Size does not mean its physical dimensions, however - it means how powerful it is.

Measured in kilowatts, a boiler's output level is an indication of the amount of power it has available to it to heat the water coming from your taps and for warming your radiators. The greater the output level, the more water it can heat.

If you choose a boiler whose output level is too low, you'll often find that the water is not as hot as you want it to be. If you choose a boiler whose level is too high, you'll be paying higher gas bills than you need to for years to come.

The output of the Vaillant EcoTEC Exclusive IQ 835 combi is 35 kW, so which types of property is this Vaillant ecoTEC Exclusive IQ 835 Combi boiler appropriate 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.

With combi boilers, flow rates are as important a consideration as output rates.

All combi boilers draw water from the mains. They then heat this water instantly whenever it's needed and distribute it to your radiators and taps.

A boiler's "flow rate" describes how much water a boiler can draw from the mains at any one time, which it then heats and sends around your home (measured in litres per minute). This Vaillant ecoTEC Exclusive IQ 835 Combi boiler's flow rate is 15 L/m.

If your home has a large number of radiators, a lot of bathrooms, or multiple people who wish to use the hot water at the same time, your combi boiler may not be able to draw as much water from the mains as it needs to serve everyone, regardless of how high the flow rate is.

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.


Where will the Vaillant EcoTEC Exclusive IQ 835 fit in my house?

The dimensions of the Vaillant EcoTEC Exclusive IQ 835 are 720 mm tall, 440 mm wide, and 406 mm deep.

EcoTEC Exclusive IQ 835 – condensing or non-condensing?

We recommend that you choose a condensing boiler wherever possible like the Vaillant EcoTEC Exclusive IQ 835 - try to go for the latest model, if possible, to take advantage of improving technology.

Condensing boilers capture and recycle the warmth still present in the water vapour condensation and in flue exhaust emissions created by burning gas to make them more efficient and economical to run.

You will save money on your gas bills too, plus condensing boilers are friendlier to the environment.

What energy efficiency ratings have been awarded to the Vaillant EcoTEC Exclusive IQ 835 combi?

With environmental issues in the spotlight, more and more homeowners are becoming concerned about how they heat their homes and how much they're contributing towards combatting climate change.

Central heating systems are responsible for 14% of greenhouse gas emissions in the UK. You may also be aware that the gas boilers we use emit dangerous nitrogen dioxide in large volumes in the bigger British cities.

If you decide to install a Vaillant EcoTEC Exclusive IQ 835 combi in your home, will you be helping the environment with your choice? Let’s have a look at the figures.

All boilers manufactured and installed in the UK are required to have an energy efficiency rating of 92% or above (or a good “A” SEDBUK rating). Before April 2018, when the law changed, the minimum energy efficiency level permissible was 88% (86-90% is a SEDBUK "B" rating and 90%+ is an "A" rating).

A boiler's energy efficiency rating indicates the amount of energy used and wasted during normal operational performance.

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

The Energy Related Products Directive (ERP) is European legislation that applies to all products which use or consume energy during their lifespan, including during the manufacturing process and when they're in actual use, right through to the point of final disposal.

The aim is to encourage manufacturers to create new products that are kinder to the environment and create fewer harmful gas emissions.

The Vaillant EcoTEC Exclusive IQ 835 has an ERP Heat rating of "A" and an ERP Water rating of "A".

What length of warranty does the Vaillant EcoTEC Exclusive IQ 835 come with?

The manufacturer offers a parts and labour warranty of 5 years on the Vaillant EcoTEC Exclusive IQ 835 boiler to new customers.


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%

In our PlumbProud quality testing, this Vaillant ecoTEC Exclusive IQ 835 Combi boiler scores 91.90%. We determine our rating based on a number of different factors including installation costs, manufacturer guarantees, energy efficiency, and operating costs.

On most non-complicated installations, we would expect this Vaillant ecoTEC Exclusive IQ 835 Combi boiler to cost £2,600 supplied and fully professionally installed.

If you would like a free quote and professional advice and guidance to help you decide if the Vaillant EcoTEC Exclusive IQ 835 is the right choice for your home, please get in touch. You can do this by entering your postcode in the quote boxes on this page, click here to email us or give us a call on 01604 343053.


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

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

The Vaillant EcoTEC Exclusive IQ 835 may be worth considering if you are looking for a combi boiler for your house or flat.

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.

Should I install a Vaillant EcoTEC Exclusive IQ 835 combi boiler in my house or flat?

It's best to choose a boiler whose size or "output" is right for your property. With boilers, however, size does not mean how big a boiler is, it means how much power it has.

A boiler’s output indicates the amount of power it can use when heating the water which it then sends to your taps and radiators. The higher the output rate, the more water it can heat.

If a boiler’s output is too low, there will be times when your hot water might not be as hot as you want it to be. If it is too high, you’ll likely be paying more than you need to for your gas.

Measured in kilowatts, the Vaillant EcoTEC Exclusive IQ 835 combi's output level is 35 kW, so which types of property would this Vaillant ecoTEC Exclusive IQ 835 Combi boiler be an appropriate choice for?

A PlumbProud Gas Safe boiler installer would recommend that the most suitable type of property for this Vaillant ecoTEC Exclusive IQ 835 Combi boiler would be larger properties including detached homes containing 15 or more radiators and two or more bathrooms.

When choosing a combi boiler for your home, you need to think about "flow rates" as well as output rates. This Vaillant ecoTEC Exclusive IQ 835 Combi boiler's flow rate is 15 L/m.

This indicates the maximum volume of hot water (measured in litres per minute) that your boiler can heat then distribute to your taps, showers and radiators at any one time. The greater the demand for hot water in your home, the higher the flow rate you will require.

However, all combi boilers like the Vaillant EcoTEC Exclusive IQ 835 draw water directly from the mains and heat it instantly.

This means that they can only heat and distribute water at the rate it enters the property (the "mains pressure" rate). For example, if your mains pressure is 11 litres per minute, this will be the highest flow rate you can achieve even if your boiler's flow rate is 17l/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.


Vaillant EcoTEC Exclusive IQ 835 - size in millimetres

The size of the Vaillant EcoTEC Exclusive IQ 835 boiler is 720 mm high, 440 mm wide, and 406 mm deep.

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

The Vaillant EcoTEC Exclusive IQ 835 is a condensing gas boiler - we strongly recommend that you choose one of the latest condensing models if possible.

With a condensing boiler, you save money on your gas bills because your boiler captures and recycles the heat present in the flue exhaust gases and water vapour condensation for re-use, meaning they operate far more economically and efficiently.

Is the Vaillant EcoTEC Exclusive IQ 835 combi rated as environmentally friendly?

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.

Gas boilers are responsible for dangerous atmospheric levels of nitrogen dioxide emissions in Britain's biggest cities and, overall, 14% of the UK’s greenhouse gases are produced by our domestic central heating systems.

Would installing a Vaillant EcoTEC Exclusive IQ 835 combi boiler in your home help combat climate change? What do the figures suggest?

Under current UK law, all boilers must achieve a minimum energy efficiency level of 92% (a low to good SEDBUK "A" rating). The minimum level was raised from its previous 88% in April 2018.

Energy efficiency scores are intended to inform consumers of the amount of energy used and wasted when a boiler is in normal operation.

The Vaillant EcoTEC Exclusive IQ 835 was awarded an efficiency rating of 94% with a SEDBUK band rating of "A".

In 2015, the Energy Related Products Directive (ERP) came into force. The legislation applies to all products that consume energy in production, during their active life, and at the point of final disposal.

The ERP was introduced to incentivise manufacturers to create products that emitted fewer harmful gases with the larger aim of protecting the wider environment.

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

How many years' warranty does the Vaillant EcoTEC Exclusive IQ 835 combi come with?

The Vaillant EcoTEC Exclusive IQ 835 is supplied with 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%
Menu