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Vaillant EcoTEC Plus 938 boiler

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Plumbproud rating

91.46%

Vaillant ecoTEC Plus 938 Combi Gas boiler

On the PlumbProud quality scoring system, we rate this Vaillant ecoTEC Plus 938 Combi boiler 91.46%. To determine our rating, we take lots of different factors into consideration from price installed to manufacturer guarantees, energy efficiency, likely cost of running, and more.

On straightforward installations, we would expect to charge you £2,700 for this Vaillant ecoTEC Plus 938 Combi boiler fully installed.

Wondering if the Vaillant EcoTEC Plus 938 is the right boiler for your home? Then speak to a professional here by getting in touch via email or call us on 01604 343053. You can also get a free quote by entering your postcode in the box on the page.


Installed price around

£2,700

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Vaillant ecoTEC Plus 938 Combi Gas boiler frequently asked questions

Is the Vaillant EcoTEC Plus 938 a standard, combi or system boiler?

The Vaillant EcoTEC Plus 938 is worthy of consideration if you're looking for a combi boiler for your flat or house.

Traditional boilers often have up to two tanks that either store heated water or water to be heated later. Boiler manufacturers introduced combi boilers in the 1970s to avoid the need for those big tanks. Combi boilers allow homeowners to benefit from the reliable central heating and hot water level they want but without having to give up so much space within their properties - remember that homes in the UK are among the smallest in the developed world.

Your taps and radiators get the hot water they need with a combi boiler. Combi boilers draw cold water direct from the mains which is then heated instantly on demand and distributed to your radiators and taps.

However, combi boilers cannot heat very large volumes of water, which is their main disadvantage. So, for example, when someone wants to take a shower while another person wants to use a hot water tap to do the dishes, water pressure and quantity to both points decreases.

Is the Vaillant EcoTEC Plus 938 combi boiler suitable for my house or apartment?

Selecting the right boiler for your home means choosing a boiler that is the right size. And, by size, we don't mean how big it is, we mean how powerful it is - the "output".

Your boiler’s output is a measurement of the power it has available to it to heat the water you need for your radiators or for when you turn on a tap, bath or shower. A higher output rate means it has more power and can heat more water.

It's important to choose an output that matches the demand for water in your home because if your boiler has too low an output, you'll often find only lukewarm water comes out of your taps or heats your radiators. If it’s too high, you’ll be paying more for your gas than you need to.

The Vaillant EcoTEC Plus 938 combi has an output of 38.7 kW, so which types of property would this Vaillant ecoTEC Plus 938 Combi boiler be appropriate for?

A PlumbProud Gas Safe boiler installer would recommend that this Vaillant ecoTEC Plus 938 Combi boiler is appropriate for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

You should also consider a combi boiler's "flow rate" when making your choice.

The flow rate indicates how much water it can take from the mains supply at any one time (measured in litres per minute), which it then heats and distributes to different points in your home like your bathroom, kitchen and radiators. This Vaillant ecoTEC Plus 938 Combi boiler's flow rate is 16 L/m.

Combi boilers have no storage tanks like system or heat only boilers. This means that if the water pressure where you live is low, there's no benefit in spending money on a combi with a high flow rate because a high flow rate doesn't mean it can draw any more water from the mains.

In addition, there might be lots of people in your household who want to use hot water at the same time while also having the central heating on. Given that average mains pressure in the UK is between 10 and 12 litres per second and a power shower usually requires about 12 litres of water per minute, a combi boiler might not be the right choice for you and your family.

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 938 boiler?

The Vaillant EcoTEC Plus 938 measures 720 mm in height by 440 mm in width by 600 mm in depth.

Is the Vaillant EcoTEC Plus 938 a condensing or non-condensing boiler?

Condensing gas boilers like the Vaillant EcoTEC Plus 938 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.

Does the Vaillant EcoTEC Plus 938 combi protect the environment?

Price and performance are two important issues when choosing a boiler but now, for many people in the UK, so is the environmental impact of how we heat our homes and its effect on 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.

Will installing a Vaillant EcoTEC Plus 938 combi in your home be a positive contribution to the environment? The figures below will tell you more.

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 938 was awarded an efficiency rating of "94%", equivalent to a "A" rating on the SEDBUK system.

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 Plus 938 has an ERP rating of "A" for heat and "A" for hot water.

Will I be covered if the Vaillant EcoTEC Plus 938 combi breaks down?

A parts and labour warranty of 5 years is included with the Vaillant Vaillant EcoTEC Plus 938 boiler.


Vaillant ecoTEC Plus 938 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?No
P/L Warranty5 Years
Output in kW38.7 kW
Height720 mm
Width440 mm
Depth600 mm
MountingWall
Flow rate16 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 938 Combi Gas boiler

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  2. Vaillant ecoTEC Plus 938
Plumbproud rating for this boiler
91.46%

We have determined a rating of 91.46% for this Vaillant ecoTEC Plus 938 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 most non-complicated installations, we would expect this Vaillant ecoTEC Plus 938 Combi boiler to cost £2,700 including installation if you choose PlumbProud to do the work.

You can get more information and a free quote for the Vaillant EcoTEC Plus 938 boiler by entering your postcode in the quote boxes on this page, clicking here to email us, or by giving us a call on 01604 343053.


Installed price guideline
£2,700

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Vaillant ecoTEC Plus 938 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Condensing?Yes
Efficiency rating94%
Band ratingA
LPG Compatible?No
P/L Warranty5 Years
Output in kW38.7 kW
Height720 mm
Width440 mm
Depth600 mm
MountingWall
Flow rate16 L/m
ERP HeatA
ERP WaterA

Vaillant ecoTEC Plus 938 Combi Gas boiler frequently asked questions

Is the Vaillant EcoTEC Plus 938 a combi boiler, system boiler or regular boiler?

If you’re looking for a combi boiler for your house or flat, you may wish to the consider the Vaillant EcoTEC Plus 938.

Combi boilers have much to recommend them - not least the fact that they save a lot of space. Combination (or combi) boilers were introduced by manufacturers in the 1970s to provide practical central heating and hot water distribution to smaller properties - remember that UK houses and flats tend to be among the smallest in the developed world.

Traditional boilers require one or more storage tanks to keep hot water warm and to store water for heating later. In contrast, combi boilers draw water directly from the mains supply and heat it instantly, removing the need for a storage tank. The heated water is then distributed to your taps and radiators on demand.

While combi boilers are suitable choices for many properties, especially those without a loft, there is also a disadvantage in using them. Water is heated instantly and the volume of water that can be heated at any one time is limited. This can result in less water being sent to taps and showers if more than one is being used simultaneously. In these instances, the water pressure to both points will drop.

Is the Vaillant EcoTEC Plus 938 combi suitable for my house or flat?

You should make sure that the boiler you choose for your property is the right "size". And size doesn't mean its physical dimensions. Size means how much power it has - the "output".

A boiler's output level measures how much power it can use to provide you with the hot water you need for your radiators and taps. If a boiler has a high output rate, it can heat greater volumes of water.

If you choose a boiler with too low an output, you'll find that the water coming out of your taps and in your radiators won't be as hot as you want it to be. Choosing one whose output is too high means you'll pay more than you need to for the gas your boiler needs to work.

The Vaillant EcoTEC Plus 938 combi outputs at a maximum of 38.7 kW, so which types of property would this Vaillant ecoTEC Plus 938 Combi boiler be appropriate for?

An experienced PlumbProud Gas Safe engineer would recommend that the level of output from this Vaillant ecoTEC Plus 938 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 thinking about installing a combi boiler like the Vaillant EcoTEC Plus 938 in your home, you should consider flow rates as well as output rates. This Vaillant ecoTEC Plus 938 Combi boiler's flow rate is 16 L/m.

The flow rate indicates the maximum volume of water (measured in litres per minute) that your boiler can heat up and send to your radiators, taps and showers at any one time. The more taps and showers that could be in use simultaneously or the greater the number of radiators you have, the higher the flow rate you need.

However, you should establish what the mains pressure is at your property as a combi boiler can only heat the water that comes into your home.

For example, if your mains pressure is 12 litres per minute, your boiler can only heat and distribute hot water at a rate of 12 litres per minute even if it has a higher flow rate capacity. Typically, a power shower will require 10 litres of water 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.


Vaillant EcoTEC Plus 938 size

The dimensions of the Vaillant EcoTEC Plus 938 are 720 mm [H] x 440 mm [W] x 600 mm [D].

Vaillant EcoTEC Plus 938 – condensing or non-condensing?

We recommend that, if possible, you select one of the very latest condensing gas boilers on the market like the Vaillant EcoTEC Plus 938.

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 EcoTEC Plus 938 combi a good choice for the environment?

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.

In the UK, central heating systems account for 14% of greenhouse gas production. Gas boilers in particular are responsible for emissions of dangerous nitrogen dioxide in British cities.

If you would like your next boiler to help in the fight against climate change, would the Vaillant EcoTEC Plus 938 combi be a suitable choice?

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 938 are 94% with a SEDBUK rating 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 Plus 938 has a rating of "A" for heat and "A" for water.

How many years' warranty does the Vaillant EcoTEC Plus 938 combi come with?

The parts and labour warranty offered with this Vaillant ecoTEC Plus 938 Combi boiler covers you for 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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