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Grant VortexBlue 21kW boiler

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Plumbproud rating

66.98%

Grant VortexBlue 21kW Combi Oil boiler

We score this Grant VortexBlue 21kW Combi boiler as 66.98% 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 straightforward installations, we would expect to charge you £3,900 for this Grant VortexBlue 21kW Combi boiler fully installed.

For professional advice on whether the Grant VortexBlue 21kW is the right boiler for your home or to receive a free quotation, please call 01604 343053 to speak to our friendly team. You are also welcome to email us by clicking here or you can enter your postcode into the quotation box on this page.


Installed price around

£3,900

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Grant VortexBlue 21kW Combi Oil boiler frequently asked questions

Which category of boiler does the Grant VortexBlue 21kW fit into?

The Grant VortexBlue 21kW is worthy of consideration if you're looking for a combi boiler for your flat or house.

Traditional boilers require at least one large cylindrical tank to work, normally housed in a large landing cupboard, utility room or the attic. As the UK has some of the world's smallest residential properties, manufacturers introduced the combi boiler in the 1970s to address the issue of space while meeting homeowners' need for central heating and hot water at the same time.

Combi boilers don't need external storage tanks. Instead, they draw water directly from the mains, heat it and then distribute it on demand to the areas where it is needed.

The most important disadvantage of combi boilers is that they have a maximum capacity for the amount of water they can heat up. This means that, if one person in your household is having a shower and another person turns on a hot water tap elsewhere, then the volume, pressure and temperature of the water to both points decreases.

Is a Grant VortexBlue 21kW combi a suitable choice for my house or flat?

Whether this Grant VortexBlue 21kW 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 oil bills, whereas a boiler whose output is too low will result in cheaper oil bills but the water might not always be as hot as you want it to be.

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

Most heating engineers would suggest that the Grant VortexBlue 21kW combi boiler would be a suitable choice for installation in smaller homes and apartments with up to 10 radiators and one bathroom.

Homeowners considering fitting a combi boiler to their home need to consider flow rates as well as output rates.

The flow rate is a measurement of the volume of water a combi can instantly heat and send to the taps and radiators around your home. The higher the likely demand for hot water in your home, the higher your combi's flow rate should be. This Grant VortexBlue 21kW Combi boiler's flow rate is 15 L/m.

Unlike heat only or system boilers, combi boilers don't store hot water in a tank for later use - instead, they draw it directly from the mains. This means that the volume of water your boiler can actually process is constrained by the flow rate of water in the mains pipe.

So, if you choose a combi boiler with a 15l/m flow rate but the flow rate in your mains pipe is 12l/m, the combi boiler's working flow rate is also 12l/m.

Combi boilers are also not always the correct choice for homes with multiple bathrooms, a high number of radiators, or where more than one family member will want to use hot water at the same time.

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 Grant VortexBlue 21kW boiler?

The size of the Grant VortexBlue 21kW boiler is 860 mm tall, 614 mm wide, and 609 mm deep.

Many properties in the UK still feature a floor-standing boiler like the Grant VortexBlue 21kW. This is despite the fact that more compact wall-mounted types have been the first choice of homeowners over the last 20 years seeking more space to live for their families. If you want, you can choose to replace your floor-standing model with a wall-mounted, more compact boiler. However, this could involve having to change the pipework, adding to overall installation costs.

You would benefit from savings on your oil each year that would eventually pay off your investment in a wall-mounted boiler.

You will need to have your hot water cylinder and/or expansion tank removed if you’re considering replacing your existing heat only or system boiler with the Grant VortexBlue 21kW.

Please get in contact with PlumbProud for information and guidance on helping you make the right decision for you.

Is this Grant boiler non-condensing or condensing?

The Grant VortexBlue 21kW is a condensing oil 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.

Does the Grant VortexBlue 21kW combi protect the environment?

More and more homeowners are aware of the importance of how we heat our homes and its impact on climate change and other environmental issues.

We generate 14% of UK greenhouse gas emissions through centrally heating our domestic properties. Gas boilers are mainly responsible for harmful nitrogen dioxide emissions in larger British cities.

Would the environmental impact of installing a Grant VortexBlue 21kW combi in your home be positive? Let's look at the numbers.

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.

The ERP (or Energy Related Products Directive) is European legislation which applies to all products that consume energy throughout their lifetime.

Its purpose is to encourage manufacturers to offer products that are kinder to the environment by reducing harmful gas emissions at all stages, from production and end use right through to disposal.

The ERP rating for the Grant VortexBlue 21kW is "A" for heat and "A" for water.

What is the warranty period for the Grant VortexBlue 21kW?

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


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
Height860 mm
Width614 mm
Depth609 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

  1. Home
  2. Grant VortexBlue 21kW
Plumbproud rating for this boiler
66.98%

We scored this Grant VortexBlue 21kW Combi boiler at 66.98% on our internal benchmarking system. To determine a score, we take into consideration a number of different factors including the boiler's energy efficiency, installed price, likely running costs, and the length of the manufacturer's warranty.

This Grant VortexBlue 21kW Combi boiler will cost approximately £3,900 supplied and fully installed through PlumbProud assuming that there are no unexpected complications during the fitting.

If you would like to get in touch with us for a free quote and professional guidance and advice on whether the Grant VortexBlue 21kW is the right choice for your home, you can do so by entering your postcode in the quote boxes on this page, calling us on 01604 343053 or you can click here to email us.


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
Height860 mm
Width614 mm
Depth609 mm
MountingFloor
Flow rate15 L/m
ERP HeatA
ERP WaterA

Grant VortexBlue 21kW Combi Oil boiler frequently asked questions

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

Suitable for a house or a flat, the Grant VortexBlue 21kW combi boiler is worth considering if you want a combi boiler.

In many properties, combi boilers are more suitable than traditional types of boiler. Combi boilers heat water instantly on demand, which they draw directly from the mains supply, removing the need for storage tanks that can take up valuable space in your home.

A combi boiler is often the right choice for a smaller property, particularly if your home doesn't have a useable loft. As water is heated and delivered immediately rather than being kept warm for hours in an immersion tank, combi boilers reduce oil usage, thereby minimising your heating costs.

The main disadvantage of combi boilers is that they can only heat a certain amount of water at any one time. This means that, if two people are using different taps or showers within your home at the same time, the flow of heated water to each will be reduced, as will the water pressure and temperature.

Is a Grant VortexBlue 21kW combi a suitable choice for my house or flat?

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

Output measures in kilowatts how much power a boiler can use when heating water for your radiators or taps. The higher the output rate, the more water it can heat.

If the output rate is too low, your hot water might often be only lukewarm, and if it is too high, you will be paying more for your oil than you need to.

The Grant VortexBlue 21kW combi boiler has an output of 21 kW, so which types of property would it be most appropriate for?

A PlumbProud boiler engineer would recommend that this Grant VortexBlue 21kW Combi boiler is suitable for smaller homes and apartments with up to 10 radiators and one bathroom.

With combi boilers, you need to consider the flow rate as well as the output rate. The flow rate (shown in litres per minute) measures how much water your boiler can draw from the mains which it then instantly heats and distributes to your taps and radiators.

However, a high flow rate is of little to no value if your local water pressure is low. If your local mains water pressure is 10l/m and your flow rate is 12l/m, your boiler will only be able to process 10l/m.

If you live in an area with high water pressure but your household has multiple bathrooms and/or radiators and many members of your household want to use hot water at the same time (like morning or evening baths or showers), it's unlikely that you'll be able to find a combi with a high enough flow rate.

As an indication, a power shower needs about 10 litres of water per minute, whereas the flow rate of this Grant VortexBlue 21kW Combi boiler is 15 L/ml/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 Grant VortexBlue 21kW in millimetres

The Grant VortexBlue 21kW's dimensions are 860 mm [H] x 614 mm [W] x 609 mm [D].

Many homeowners dislike the floor-standing boilers (like the Grant VortexBlue 21kW) they have in their properties because they feel that they are bulky and take up too much room. If this is you and you want to replace what you have now with a compact, wall-mounted boiler, we can do this for you, although please note that you may need to pay for new piping.

The oil bill savings offered by modern boilers are significant, however, and you should be able to recoup your investment in a few years.

Please also note that if you’re choosing to replace an existing heat only or system boiler with the Grant VortexBlue 21kW, you will need to budget for the removal of your hot water cylinder and/or expansion tank.

Please contact PlumbProud for professional information and guidance on the best course of action and we’ll share our advice with you.

VortexBlue 21kW – non-condensing or condensing?

We strongly recommend that you choose a condensing boiler like the Grant VortexBlue 21kW - the technology is improving every year so the newer the boiler, the better.

A condensing boiler captures and recycles the warmth still present in flue exhaust gases and water vapour condensation into heat, allowing it to perform more efficiently on tasks like heating the colder water returning from your radiators.

They also offer significant annual savings on household oil bills as well as being more environmentally friendly.

How energy efficient is the Grant VortexBlue 21kW combi 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.

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.

Would choosing the Grant VortexBlue 21kW combi boiler be an environmentally friendly decision? Here's what the figures say.

Boilers manufactured and installed in the UK are assigned energy efficiency ratings following testing to an agreed set of standards. These scores indicate how much energy the boiler uses and how much goes to waste when it's in operation.

By law, boilers must achieve a SEDBUK rating of "A" subject to achieving a minimum of 92% energy efficiency. Prior to April 2018, the minimum was 88% (88% and 89% on the SEDBUK are graded "B" and 90% and above is graded "A").

The Grant VortexBlue 21kW was awarded an efficiency rating of 90.8% with a SEDBUK band rating of "A".

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?

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


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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