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Vaillant EcoTEC Plus 835 boiler

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Plumbproud rating

92.60%

Vaillant ecoTEC Plus 835 Combi Gas boiler

Considering lots of different factors such as price installed, manufacturer guarantees, energy efficiency, and the likely running cost, we’ve given this Vaillant ecoTEC Plus 835 Combi boiler a rating of 92.60% using our PlumbProud quality scoring system.

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.

For a free quote on the Vaillant EcoTEC Plus 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

£2,400

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Vaillant ecoTEC Plus 835 Combi Gas boiler frequently asked questions

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

The Vaillant EcoTEC Plus 835 is an option you may wish to consider if you’re looking for a combi boiler for your house or flat.

Traditionally, boilers needed one or more large tanks installed in your property to store their heated water or water that was to be heated later. These tanks were often too large to be practical for most homes so the combi boiler was introduced to Britain in the 1970s by manufacturers to help homeowners overcome this issue.

Instead of using tanks as storage, a combi boiler heats water on demand. It draws water from the mains and heats it instantly on demand before distributing it to wherever it is needed in a property, be it your taps or radiators.

Unfortunately, combi boilers have one main disadvantage for larger properties or larger households. Because they have a maximum volume of water that can be heated on demand at any given time, water pressure, volume and temperature will drop if, for example, someone is taking a shower and another person in your home wants to use a hot water tap at the same time.

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.

The output level of a boiler tells you how much power it has to heat the water coming from your taps and warming up your radiators. The higher the output level, the greater the volume of water it can heat up.

If the output (measured in kilowatts) is too high, you'll pay higher gas bills and your water will be piping hot. Too low and the water coming out of your taps and being fed into your radiators will often be lukewarm.

The Vaillant EcoTEC Plus 835 combi outputs at a maximum of 35 kW, so which types of property would this Vaillant ecoTEC Plus 835 Combi boiler be appropriate for?

Most Gas Safe engineers would suggest that the Vaillant EcoTEC Plus 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.

When choosing a combi boiler like the Vaillant EcoTEC Plus 835, you need to consider the "flow rate" as well as the output rate. Flow rates (measured in litres per minute) indicate the volume of hot water that the boiler can heat up and then distribute to your taps and radiators.

However, combi boilers draw water from the mains and this means they can only heat the amount of water that actually enters your property.

What this means is that, if your mains pressure is 12 litres per minute, that is your boiler's effective flow rate even if it has the capacity to process 18 litres per minute. This Vaillant ecoTEC Plus 835 Combi boiler's flow rate is 14 L/m.

To give you an idea of the flow rate you might need, a power shower typically requires around 12 litres of water per minute and a basin tap requires 4-8 litres per minute.

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 EcoTEC Plus 835 boiler?

The Vaillant EcoTEC Plus 835 stands at 720 mm tall, 440 mm wide and 372 mm deep.

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

We recommend the Vaillant EcoTEC Plus 835 as it is a modern condensing gas boiler from a trusted manufacturer with a reputation for supplying highly energy-efficient boilers.

Condensing boilers capture the heat still present in water vapour condensation and flue exhaust gases and recycle it back into the heating system. With this extra energy, your boiler can, among other tasks, reheat colder water coming back from your radiators without having to burn more gas.

Condensing boilers significantly reduce your quarterly gas costs and they're better for the environment.

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

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.

Dangerous levels of nitrogen dioxide emissions in larger UK cities are caused by gas boilers in domestic properties, and 14% of the UK’s greenhouse gas production is as a result of central heating.

If you decide to install a Vaillant EcoTEC Plus 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 supplied in the UK are assigned two energy efficiency ratings. By law, they must achieve a SEDBUK "A" rating subject to a minimum efficiency level of 92%. Prior to that, the minimum was 88% (88% and 89% are equivalent to a SEDBUK "B" grade and 90% and above an "A" grade).

The ratings awarded to the Vaillant EcoTEC Plus 835 are 94% with a SEDBUK 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 Plus 835 has been awarded an ERP rating of "A" for heat and "A" for water.

What is the warranty period on a Vaillant EcoTEC Plus 835 combi boiler?

The Vaillant EcoTEC Plus 835 boiler comes with a parts and labour warranty of 5 years.


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%

We score this Vaillant ecoTEC Plus 835 Combi boiler as 92.60% 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 a standard fit, we would expect this Vaillant ecoTEC Plus 835 Combi boiler to cost you £2,400 supplied and fully installed by an experienced Gas Safe PlumbProud fitter.

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 Vaillant EcoTEC Plus 835 boiler is the right choice for your home.


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

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

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

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.

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

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?

A PlumbProud Gas Safe boiler installer would recommend that the most suitable type of property for this Vaillant ecoTEC Plus 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 Plus 835 Combi boiler's flow rate is 14 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 Plus 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.


The size of 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 strongly suggest that you choose either this model or a recently released model if at all possible.

A condensing boiler captures and recycles the warmth present in flue exhaust gases and water vapour condensation created by the burning of gas to warm up the water coming back into your boiler - for example, from your radiators.

Condensing boilers cost less to run (lower gas bills) and are better for the environment.

How does the Vaillant EcoTEC Plus 835 combi rate environmentally?

As the British public has become more conscious of climate change, many homeowners consider the environment when choosing how to heat their homes.

About 14% of the greenhouse gases we produce in the UK come from the power needed for central heating. In bigger British cities, gas boilers are a significant source of nitrogen dioxide emissions.

Would choosing the Vaillant EcoTEC Plus 835 combi boiler be an environmentally friendly decision? Here's what the figures say.

An energy efficiency rating of 92% or above is a legal requirement for all boilers manufactured and installed in the UK today. 92% is equivalent to a low-to-middle "A" grade on the "Seasonal Efficiency of Domestic Boilers" (SEDBUK) scale.

Energy efficiency measures how much energy a boiler uses and wastes in the course of its normal operation. The lower the waste, the lower your gas bills.

The Vaillant EcoTEC Plus 835 was awarded an efficiency rating of "94%", equivalent to a "A" rating on the SEDBUK system.

Energy-efficient boilers help the environment as they require less fuel and emit fewer harmful gases. In 2015, the EU introduced the Energy Related Products Directive (ERP), the aim of which was to ensure that all manufacturers, including boiler manufacturers, developed more efficient products and processes.

The legislation aims to conserve energy at all life cycle stages from initial production to actual use by the customer, through to the point of disposal.

The Vaillant EcoTEC Plus 835 has been given an ERP rating of "A" for heat and "A" for water.

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

The Vaillant EcoTEC Plus 835 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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