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Vaillant EcoFIT Pure 835 boiler

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Plumbproud rating

90.17%

Vaillant ecoFIT Pure 835 Combi Gas boiler

We score this Vaillant ecoFIT Pure 835 Combi boiler as 90.17% 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.

On most non-complicated installations, we would expect this Vaillant ecoFIT Pure 835 Combi boiler to cost £2,200 supplied and fully professionally installed.

Get a better understanding of installation costs for the Vaillant EcoFIT Pure 835 by entering your postcode in the box supplied on this page. You can also call our professional team with any boiler-related queries on 01604 343053. Alternatively, please click here to email us.


Installed price around

£2,200

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Vaillant ecoFIT Pure 835 Combi Gas boiler frequently asked questions

What type of boiler is the Vaillant EcoFIT Pure 835 - regular, system or combi?

The Vaillant EcoFIT Pure 835 is a combi boiler you may wish to consider if you want this type of boiler for your house or flat.

Combi boilers provide hot water or heating for your home on demand. You just need to turn the tap to get hot water or switch on the radiator and you’ll feel your home warm up within minutes.

In contrast, traditional boilers required either one or two large storage tanks to work - one to heat and keep water warm and the other to hold cold water for later heating. If the immersion tank was empty, it wasn’t uncommon to wait up to an hour for enough hot water to fill a bath, for example.

Combi boilers draw cold water from the mains and then heat it instantly whenever it's needed, all from one small unit.

The one disadvantage to combi boilers is that, if more than one point is in use at any one time (for example, if someone is taking a shower and another person turns on a hot water tap elsewhere in the property), water pressure, temperature and volume drop to both points.

Is a Vaillant EcoFIT Pure 835 combi boiler suitable for my house or flat?

Whether this Vaillant ecoFIT Pure 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 EcoFIT Pure 835 combi is 35 kW, so which types of property would this model be appropriate for?

Most Gas Safe engineers would suggest that the Vaillant EcoFIT Pure 835 combi boiler would be a suitable choice for installation in larger properties including detached homes with 15 or more radiators and two or more bathrooms.

Please remember too that all combi boilers draw water from the mains - they have no storage tanks. Combis heat the water from the mains on demand and then send it to wherever it's needed in the house, like a radiator, a bathroom or a kitchen.

The speed at which it can do this is called the "flow rate", which is measured in litres per minute. If you have a lot of radiators and bathrooms in your home and multiple people are regularly trying to use the hot water at one time, such as in the morning or evening, you'll need a combi with a high flow rate. This Vaillant ecoFIT Pure 835 Combi boiler's flow rate is 14 L/m.

However, it's not that simple. Combis can only draw water from the mains at the speed it's delivered. If the flow rate of the local water supply is 11l/m, you shouldn't purchase a boiler with a flow rate of 17l/m because it will never be able to use that extra capacity.

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 Vaillant EcoFIT Pure 835 boiler?

Vaillant’s EcoFIT Pure 835 is 700 mm tall, 390 mm wide, and 295 mm deep.

Is the Vaillant EcoFIT Pure 835 condensing or non-condensing?

Condensing boilers convert the warmth present in flue exhaust gases and water vapour condensation into heat which they then recycle to increase the temperature of the colder water returning to your system.

We recommend that homeowners choose a condensing boiler like the Vaillant EcoFIT Pure 835 for this reason - the more recent your model the better because the technology improves every year.

You'll benefit from lower quarterly gas bills and condensing boilers are also much more environmentally friendly.

Is the Vaillant EcoFIT Pure 835 combi boiler rated as environmentally friendly?

How we heat our homes and the damage we might be doing to the environment as a result has become an important point of concern to many homeowners worried about climate change.

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 EcoFIT Pure 835 combi boiler in your home be a green choice? Let's look at the numbers.

Boilers manufactured after April 2018 in the UK must achieve an "A" on the SEDBUK grading system as well as score a minimum of 92% on a separate energy efficiency test. Prior to that, the minimum was 88% - boilers rated at 88% and 89% were given a “B” rating (90% and higher were given an "A").

An energy efficiency rating describes how much energy the boiler uses and how much it wastes when in use.

The Vaillant EcoFIT Pure 835 was awarded an efficiency rating of 94% with 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 EcoFIT Pure 835 has an ERP Heat rating of "A" and an ERP Water rating of "A".

Am I covered if the Vaillant EcoFIT Pure 835 combi boiler breaks down?

The Vaillant EcoFIT Pure 835 boiler comes with a parts and labour warranty lasting 2 years.


Vaillant ecoFIT Pure 835 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW35 kW
Height700 mm
Width390 mm
Depth295 mm
MountingWall
Flow rate14 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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Vaillant ecoFIT Pure 835 Combi Gas boiler

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  2. Vaillant ecoFIT Pure 835
Plumbproud rating for this boiler
90.17%

Using the PlumbProud boiler quality scoring system, we have rated this model at 90.17%. To determine the rating, we factor in the price installed, energy efficiency, running costs, the warranty offered, and more.

This Vaillant ecoFIT Pure 835 Combi boiler will cost around £2,200 fitted through PlumbProud where there are no complications during the installation.

To get a free quote for the installation of the Vaillant EcoFIT Pure 835 boiler in your home, simply enter your postcode in the box provided on this page. You can also find out whether this is the right boiler for your home by clicking to email our installation team or by calling us on 01604 343053.


Installed price guideline
£2,200

Get your free quote

Vaillant ecoFIT Pure 835 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW35 kW
Height700 mm
Width390 mm
Depth295 mm
MountingWall
Flow rate14 L/m
ERP HeatA
ERP WaterA

Vaillant ecoFIT Pure 835 Combi Gas boiler frequently asked questions

Is the Vaillant EcoFIT Pure 835 boiler a combi, system or regular boiler?

The Vaillant EcoFIT Pure 835 boiler could be suitable for your house or flat if you are looking for a new combi boiler.

Combi boilers are excellent for providing hot water and heat for your radiators just when you need it. When you have a combi boiler installed in your home, you just turn on the tap and the hot water for your bath, shower, washing dishes and other activities is there when you need it. It also provides the heat you need to keep your radiators warm.

A combi boiler heats the cold water passing through it, which it draws from the mains. This newly heated water can then be distributed to whichever hot tap or radiator needs it.

In the past, boilers needed at least one storage tank to hold water that was either already heated or would be heated later. Sometimes, you'd have to wait for hot water because there was none left. In addition, storage tanks took up a lot of space and most UK homes are pretty small.

The main disadvantage to combi boilers is that they can only heat a certain amount of water at any one time, meaning the pressure, volume and temperature of water will decrease if more than one tap is on at the same time or if both the shower and washing machine are on together.

Should I install a Vaillant EcoFIT Pure 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 EcoFIT Pure 835 combi's output level is 35 kW, so which types of property would this Vaillant ecoFIT Pure 835 Combi boiler be an appropriate choice for?

A heating engineer would recommend that this Vaillant ecoFIT Pure 835 Combi boiler would provide adequate heating and hot water for larger properties including detached homes with up to 15 or more radiators and two or more bathrooms.

With all combi boilers, you need to consider the "flow rate" as well as the output rate when making your decision.

Like all combi boilers, the Vaillant EcoFIT Pure 835 draws water from the mains. It instantly heats that water and then distributes it to the parts of your home which need it - taps, radiators, bathrooms, and so on. This Vaillant ecoFIT Pure 835 Combi boiler's flow rate is 14 L/m.

There is no benefit to purchasing a boiler with a high flow rate if the local water pressure is not that good - a high flow rate doesn't mean that your combi can draw more water from the mains.

In addition, if you live in a home with a large number of radiators and more than one bathroom and if more than one person regularly wants to use hot water at a time, a combi boiler may struggle to provide enough water at a hot enough temperature.

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 EcoFIT Pure 835 fit in my house?

The size of the Vaillant EcoFIT Pure 835 boiler is 700 mm high, 390 mm wide, and 295 mm deep.

Is the Vaillant EcoFIT Pure 835 a condensing or non-condensing boiler?

We recommend that, if possible, you select one of the very latest condensing gas boilers on the market like the Vaillant EcoFIT Pure 835.

Condensing boilers are better for the environment because they capture and recycle the heat still present in flue exhaust gases and water vapour condensation for re-use, meaning lower greenhouse gas emissions.

They're also a lot cheaper to run meaning that, if you're replacing a very old and inefficient boiler, the savings on your gas bill over 5-10 years add up to more than you pay for the boiler itself.

Is the Vaillant EcoFIT Pure 835 combi 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.

Central heating creates 14% of the UK’s greenhouse gases. And in Britain's larger cities, gas boilers are responsible for dangerous levels of nitrogen dioxide emissions.

Let's take a closer look at whether installing a Vaillant EcoFIT Pure 835 combi would be a good choice for the environment.

All boilers manufactured and supplied in the UK must achieve an energy efficiency rating of at least 92% (an "A" SEDBUK grade). This is higher than the previous 88%, which was a legal requirement prior to April 2018.

The energy efficiency rating is used to work out how much energy a boiler both uses and wastes when it's switched on and working correctly - its standard functioning and operation.

The Vaillant EcoFIT Pure 835 is rated as 94% energy efficient, equivalent to a "A" SEDBUK rating.

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 Vaillant EcoFIT Pure 835 has a rating of "A" for heat and "A" for hot water production.

How long is the warranty period on a Vaillant EcoFIT Pure 835 combi boiler?

Vaillant’s EcoFIT Pure 835 boiler includes a parts and labour warranty of 2 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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