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Grant VortexBlue 21kW boiler

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Plumbproud rating

66.99%

Grant VortexBlue 21kW Combi Oil boiler

We score each boiler we sell by considering a number of different factors including price installed, manufacturer guarantees, energy efficiency, the likely cost of running, and more. For this Grant VortexBlue 21kW Combi boiler, we have awarded a rating of 66.99%.

Fitted by an experienced Gas Safe PlumbProud engineer, the cost for this Grant VortexBlue 21kW Combi boiler will be in the region of £3,900 on a standard, non-complicated installation.

Enter your postcode in the box provided and receive a free quote for the Grant VortexBlue 21kW 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 around

£3,900

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Grant VortexBlue 21kW Combi Oil boiler frequently asked questions

Is the Grant VortexBlue 21kW a combi, system or regular boiler?

You may wish to consider installing the Grant VortexBlue 21kW if you are looking for a combi boiler for your house or flat.

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 the Grant VortexBlue 21kW combi boiler a suitable choice for my property?

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

Boiler output is measured in kilowatts and tells you how much power a boiler can use to heat the water your taps, showers and radiators need. The higher the output, the more power it has.

When choosing a boiler, you should choose one that can cope with the peak demand for hot water in your home and not just your typical usage.

If its output is too low, sometimes your hot water will not be hot enough, but if your boiler's output is too high for your needs, your oil bills will go up and not down.

The output of the Grant VortexBlue 21kW combi is 21 kW, so which types of property would this Grant VortexBlue 21kW Combi boiler be an appropriate choice for?

A PlumbProud Gas Safe engineer would recommend that the most suitable type of property for a Grant VortexBlue 21kW combi would be smaller homes and apartments containing up to 10 radiators and providing hot water for one bathroom.

In addition to the output rate, you should consider a boiler's "flow rate" (measured in litres per minute) when choosing a combi boiler.

If you have a lot of radiators and bathrooms in your home and members of your household want to use hot water at the same time (like morning or evening showers and baths), you'll need a boiler with a high flow rate. This Grant VortexBlue 21kW Combi boiler's flow rate is 15 L/m.

However, it's not that simple. Combis can only draw water from the mains at the speed it's delivered. Homes with higher than average demand for hot water, and particularly those in low mains pressure areas, may find that a combi boiler is not the right answer for them.

When our engineer comes out to quote you, they may recommend that you choose a heat only boiler or system boiler instead to better serve you and your family.


What size is a Grant VortexBlue 21kW boiler?

The Grant VortexBlue 21kW measures 945 mm in height and has a width of 658 mm and a depth of 966 mm.

Floor-standing external combi boilers like the Grant VortexBlue 21kW are housed in a sturdy weatherproof casing to protect them from the elements, water ingress, and the risk of rust. Heating engineers also find external boilers much easier to access on repair and maintenance visits.

As the boiler is outdoors, there is less risk of an oil leakage into your home that can cause significant damage and leave your property with an unpleasant, hard-to-remove odour. In addition, there is far less danger to you and your family from carbon monoxide leakage as, in the event of a fault, the gas will disperse in the outside atmosphere.

Is the Grant VortexBlue 21kW condensing or non-condensing?

We recommend that, if possible, you select one of the very latest condensing oil boilers on the market like the Grant VortexBlue 21kW.

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 oil bill over 5-10 years add up to more than you pay for the boiler itself.

How does the Grant VortexBlue 21kW combi rate environmentally?

Many homeowners are becoming increasingly concerned about how they heat their homes and the impact it has on climate change and other important environmental issues.

Around 14% of the greenhouse gases produced in the UK is a result of our central heating systems. Gas boilers are responsible for dangerous levels of nitrogen dioxide emissions in some of our largest cities.

Let's take a closer look at whether installing a Grant VortexBlue 21kW combi would be a good choice for the environment.

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 Grant VortexBlue 21kW was given an efficiency rating of 90.8% and a SEDBUK grading of "A".

The ERP (Energy Related Products Directive) is European legislation that aims to reduce the use of energy at all points during a product's life, from the point of manufacture to when it's in active use right through to final disposal.

The regulation aims is to encourage manufacturers to create products that are more environmentally friendly and which reduce the harmful gas emissions associated with those products.

The ERP gradings for the Grant VortexBlue 21kW are "A" for heat and "A" for hot water.

What length of warranty does the Grant VortexBlue 21kW come with?

The Grant VortexBlue 21kW boiler is provided with a parts and labour warranty lasting 2 years.


Grant VortexBlue 21kW Oil Combi boiler specifications

Powered by GasOil
LocationExternal
Condensing?Yes
Efficiency rating90.8%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW21 kW
Height945 mm
Width658 mm
Depth966 mm
MountingFloor
Flow rate15 L/m
ERP HeatA
ERP WaterA

The top 10 rated Oil Combi boilers

Using the Plumbproud scoring system, the current 10 ten Oil Combi boilers assessed using a number of important variables are as follows:

1Worcester Bosch Greenstar Heatslave II 12/1876.19%
2Worcester Bosch Greenstar Heatslave II 18/2576.12%
3Worcester Bosch Greenstar Heatslave II External 12/1875.95%
4Worcester Bosch Greenstar Heatslave II 25/3275.83%
5Worcester Bosch Greenstar Heatslave II External 25/3275.58%
6Grant Vortex Pro 2167.46%
7Grant Vortex Pro 2667.43%
8Grant Vortex Pro 26kW67.35%
9Grant Vortex Pro 2167.31%
10Grant Vortex Pro 2667.14%

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Grant VortexBlue 21kW boiler

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Grant VortexBlue 21kW Combi Oil boiler

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  2. Grant VortexBlue 21kW
Plumbproud rating for this boiler
66.99%

Considering lots of different factors such as price installed, manufacturer guarantees, energy efficiency, and the likely running cost, we’ve given this Grant VortexBlue 21kW Combi boiler a rating of 66.99% using our PlumbProud quality scoring system.

We estimate that, on a standard, non-complicated installation, the supply and fitting charge for this Grant VortexBlue 21kW Combi boiler will be around £3,900.

To receive a free quote on the Grant VortexBlue 21kW boiler, as well as professional advice on whether it will meet the needs of your home, simply enter your postcode in the quote box on this page, click here to email us, or call 01604 343053.


Installed price guideline
£3,900

Get your free quote

Grant VortexBlue 21kW Oil Combi boiler specifications

Powered by GasOil
LocationExternal
Condensing?Yes
Efficiency rating90.8%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW21 kW
Height945 mm
Width658 mm
Depth966 mm
MountingFloor
Flow rate15 L/m
ERP HeatA
ERP WaterA

Grant VortexBlue 21kW Combi Oil boiler frequently asked questions

Grant VortexBlue 21kW - a system boiler, regular boiler or combi boiler?

The Grant VortexBlue 21kW boiler is a combi boiler you may wish to consider when looking for a new 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.

Should I choose a Grant VortexBlue 21kW combi boiler for my house or flat?

Selecting the right boiler for your property means selecting 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".

The output of a boiler is measured in kilowatts. The output level determines the maximum power a boiler can use in heating the water needed for the baths, showers, taps and radiators in your home.

It's important to choose a boiler with an appropriate level of output for your property. Your boiler should be able to cope with periods of peak demand in your property and not just your average usage.

An output rate that is too low will result in an inadequate supply of hot water, while an output that is too high will mean the boiler will cost more to run than is necessary.

The output of the Grant VortexBlue 21kW combi is 21 kW kilowatts, so which types of property would this be appropriate for?

Most boiler engineers would recommend that a boiler with this output level would be most suitable for smaller homes and apartments with up to 10 radiators and one bathroom.

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 Grant VortexBlue 21kW 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 Grant VortexBlue 21kW Combi boiler's flow rate is 15 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.


What are the proportions of a Grant VortexBlue 21kW boiler?

The Grant VortexBlue 21kW measures 945 mm tall, 658 mm wide, and 966 mm deep.

Floor-standing external combi boilers like the Grant VortexBlue 21kW are housed in a strong weatherproof casing that protects them from rust and water ingress - they also offer much easier access for heating engineers if there is a fault or a repair is needed.

The risk of internal oil leaks and the damage and unpleasant odours they cause is also removed, as is the threat to your family's safety in the event of a carbon monoxide escape (the gas will simply disperse harmlessly into the atmosphere).

Is the Grant VortexBlue 21kW condensing or non-condensing?

We recommend that you select a condensing boiler like the Grant VortexBlue oil Grant VortexBlue 21kW for your home if possible because of the environmental benefits and the money you'll save on your oil bills.

Condensing boilers are much more energy-efficient than older, non-condensing models as they capture and recycle the heat still present in the water vapour condensation and flue exhaust gases that your boiler creates when burning oil for reuse.

How environmentally friendly is the Grant VortexBlue 21kW combi?

With growing concern among the public about accelerating climate change, how we heat our homes and the impact this has on the environment has become a major topic of concern for many homeowners.

Central heating accounts for 14% of greenhouse gas emissions in the UK. In larger British cities, gas boilers emit dangerous levels of nitrogen dioxide into the atmosphere.

Do the available figures suggest that installing the Grant VortexBlue 21kW combi in your property would be an environmentally friendly choice?

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 Grant VortexBlue 21kW is rated as 90.8% energy efficient, equivalent to a "A" SEDBUK rating.

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 Grant VortexBlue 21kW has been given an ERP rating of "A" for heat and "A" for water.

What is the length of the warranty on the Grant VortexBlue 21kW?

A parts and labour warranty of 2 years is included with the Grant Grant VortexBlue 21kW boiler.


The top 10 rated Oil Combi boilers

Using the Plumbproud scoring system, the current 10 ten Oil Combi boilers assessed using a number of important variables are as follows:

1Worcester Bosch Greenstar Heatslave II 12/1876.19%
2Worcester Bosch Greenstar Heatslave II 18/2576.12%
3Worcester Bosch Greenstar Heatslave II External 12/1875.95%
4Worcester Bosch Greenstar Heatslave II 25/3275.83%
5Worcester Bosch Greenstar Heatslave II External 25/3275.58%
6Grant Vortex Pro 2167.46%
7Grant Vortex Pro 2667.43%
8Grant Vortex Pro 26kW67.35%
9Grant Vortex Pro 2167.31%
10Grant Vortex Pro 2667.14%
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