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Vaillant EcoTEC Plus 835 boiler

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Plumbproud rating

92.60%

Vaillant ecoTEC Plus 835 Combi Gas boiler

Our PlumbProud quality scoring system considers important factors like energy efficiency, the length of a manufacturer’s guarantee, likely running costs, and installed price to determine a boiler's value for money. This model has received 92.60% from our engineers.

This Vaillant ecoTEC Plus 835 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.

We recommend that you speak to our friendly advisors by calling 01604 343053 to seek professional advice on whether the Vaillant EcoTEC Plus 835 boiler is right for your home. Our team can also provide you with a free quotation for this Vaillant ecoTEC Plus 835 Combi boiler. Alternatively, click here to email us or enter your postcode into the quotation box on this page.


Installed price around

£2,400

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Vaillant ecoTEC Plus 835 Combi Gas boiler frequently asked questions

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

Suitable for a house or a flat, the Vaillant EcoTEC Plus 835 combi boiler is worth considering if you want a combi boiler.

In the past, most boilers needed one or more storage tanks to operate - one to store warm water and the other for storing water to be heated later. But storage tanks are problematic in properties where space is at a premium and particularly where there is no loft. Many properties in the UK are small and so manufacturers introduced combi boilers in the 1970s to eliminate the need for tanks.

With a combi boiler, the hot water for your radiators and taps is delivered on demand. The boiler instantly heats water it draws directly from the mains internally. It then distributes the heated water around your home at mains pressure as you need it.

It is important to bear in mind that, while combi boilers have many benefits, they can only heat a certain volume of water at any given time. This means that, if you run a shower at the same time as someone else is doing the washing up in the kitchen, the volume of water passing to each point will drop, causing a fall in pressure.

Is a Vaillant EcoTEC Plus 835 combi boiler suitable for my apartment or house?

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

Your boiler’s output is a measurement of the power it has available to heat the volume of water required for your taps and radiators. The higher the output rate, the more water it can heat.

You need to be careful to select a boiler with the optimal level of output for your property though. That's because, if your boiler output is too low, your water and radiators will often not be as hot as you want them to be. If the output is too high, you’ll be paying more for gas than you need to.

The output of the Vaillant EcoTEC Plus 835 combi is 35 kW, so which types of property would this Vaillant ecoTEC Plus 835 Combi boiler be appropriate for?

An experienced PlumbProud Gas Safe engineer would recommend that the level of output from this Vaillant ecoTEC Plus 835 Combi boiler would make it a suitable installation option for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

If you are considering installing a combi boiler in your home, you need to consider the flow rate as well as the output rate.

The flow rate is the volume of water (measured in litres per minute) that your boiler can instantly heat up and send around the home. The more demand in your home for water at the same time (for example, two people taking showers in different bathrooms), the higher the flow rate you'll need.

However, the actual flow rate your boiler can deliver is also determined by your mains water pressure. If you choose a boiler with a flow rate of 16l/m but the mains water pressure is 12l/m, your boiler will only perform to 12l/m. This Vaillant ecoTEC Plus 835 Combi boiler's flow rate is 14 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.


How large is the Vaillant EcoTEC Plus 835?

The size of the Vaillant EcoTEC Plus 835 boiler is 720 mm tall, 440 mm wide, and 372 mm deep.

Is the Vaillant EcoTEC Plus 835 a condensing or non-condensing boiler?

The Vaillant EcoTEC Plus 835 is a condensing gas boiler - we’d strongly recommend that you choose the very latest condensing model for your home.

Condensing boilers run on either gas or oil and are manufactured specifically to improve energy efficiency. They do this by capturing and recycling the warmth present in flue exhaust gases and water vapour condensation into more usable heat the system can use, meaning they're far more efficient and cost less to run.

Is the Vaillant EcoTEC Plus 835 combi boiler an environmentally friendly choice?

With more and more of us concerned about environmental issues and climate change, how we heat our homes has become an important issue to many 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.

Would choosing the Vaillant EcoTEC Plus 835 combi be an environmentally-friendly choice? If so, let's look at its performance figures.

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 Vaillant EcoTEC Plus 835 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.

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 EcoTEC Plus 835 has a rating of "A" for heat and "A" for hot water production.

Am I covered if the Vaillant EcoTEC Plus 835 combi boiler breaks down?

The Vaillant EcoTEC Plus 835 boiler has a warranty covering parts and labour costs for up to 5 years after installation.


Vaillant ecoTEC Plus 835 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?No
P/L Warranty5 Years
Output in kW35 kW
Height720 mm
Width440 mm
Depth372 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 ecoTEC Plus 835 Combi Gas boiler

  1. Home
  2. Vaillant ecoTEC Plus 835
Plumbproud rating for this boiler
92.60%

On the PlumbProud quality scoring system, we rate this Vaillant ecoTEC Plus 835 Combi boiler at 92.60%. To determine a boiler's quality, we consider many different factors from price installed to manufacturer guarantees, energy efficiency, likely cost of running, and more.

On straightforward installations, we would expect to charge you £2,400 for this Vaillant ecoTEC Plus 835 Combi boiler fully installed.

Enter your postcode in the box provided and receive a free quote for the Vaillant EcoTEC Plus 835 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

Vaillant ecoTEC Plus 835 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?No
P/L Warranty5 Years
Output in kW35 kW
Height720 mm
Width440 mm
Depth372 mm
MountingWall
Flow rate14 L/m
ERP HeatA
ERP WaterA

Vaillant ecoTEC Plus 835 Combi Gas boiler frequently asked questions

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

When looking for a combi boiler for your house or flat, the Vaillant EcoTEC Plus 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.

Is a Vaillant EcoTEC Plus 835 combi boiler right for my house or apartment?

Whether this Vaillant ecoTEC Plus 835 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.

A boiler’s output is a measurement of the amount of power it can use to provide hot water to your taps and radiators. The higher its output rate, the more water it can heat.

If your new boiler’s output is too low, your hot water might not be as hot as you want it to be. If it's too high, you’ll be paying more for gas than you need to.

The output of the Vaillant EcoTEC Plus 835 combi boiler is 35 kW, so which types of property would this be appropriate for?

A PlumbProud Gas Safe engineer would recommend that this Vaillant ecoTEC Plus 835 Combi boiler is suitable for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

You'll also need to be sure to choose a combi boiler with the right flow rate for your home.

The flow rate indicates the maximum volume of hot water (measured in litres per minute) that your boiler can distribute at any given time. This means that if you and your family are likely to be using several taps and showers simultaneously or you have a lot of radiators, you need a boiler with a high flow rate. This Vaillant ecoTEC Plus 835 Combi boiler's flow rate is 14 L/m.

As with all combi boilers, the Vaillant EcoTEC Plus 835 is only able to heat and distribute water at the rate at which it actually enters your property.

For this reason, you shouldn't purchase a boiler with a very high flow rate if the flow rate in your mains pipes is lower because the extra capacity 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.


The size of the Vaillant EcoTEC Plus 835

The Vaillant EcoTEC Plus 835 is 720 mm high by 440 mm wide by 372 mm deep.

Is this Vaillant boiler condensing or non-condensing?

This Vaillant EcoTEC Plus 835 is a condensing gas boiler - we always recommend that clients choose the latest condensing models to benefit from the technology, which continues to improve year after year.

Condensing boilers capture the heat still present in flue exhaust gases and water vapour condensation, processing them through a secondary heat exchanger to, among other tasks, heat colder water returning from your radiators.

By selecting a modern condensing boiler, you'll save money on your gas bills as well as benefitting the wider environment.

Is the Vaillant EcoTEC Plus 835 combi a good choice for the environment?

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

With central heating being responsible for 14% of greenhouse gas emissions in the UK, your choice of boiler matters. Gas boilers are also responsible for the significant atmospheric volumes of dangerous nitrogen dioxide emissions in larger British cities.

Will choosing a Vaillant EcoTEC Plus 835 combi boiler for your home be positive for the environment? Let's examine the figures.

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 EcoTEC Plus 835 is rated as 94% energy efficient, equivalent to a "A" SEDBUK rating.

The Energy Related Products Directive (ERP) intends to reduce the amount of energy consumed by individual products over their entire lifetime, from the initial manufacturing process to final disposal and at all points in between.

The legislation is designed to encourage manufacturers to create products that are more environmentally friendly and which result in a reduction in harmful gas emissions.

The ERP rating for the Vaillant EcoTEC Plus 835 is "A" for heat and "A" for hot water production.

What warranty does the Vaillant EcoTEC Plus 835 combi boiler come with?

The Vaillant EcoTEC Plus 835 boiler is provided with a parts and labour warranty lasting 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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