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Grant VortexBlue 21kW boiler

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Plumbproud rating

66.98%

Grant VortexBlue 21kW Combi Oil boiler

On the PlumbProud boiler quality benchmark scoring system, we have rated this Grant VortexBlue 21kW Combi boiler at 66.98%. Ratings are determined by considering a number of important factors including the energy efficiency, price installed, warranty length, and running costs of the boiler.

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.

We recommend that you speak to our friendly advisors by calling 01604 343053 to seek professional advice on whether the Grant VortexBlue 21kW boiler is right for your home. Our team can also provide you with a free quotation for this Grant VortexBlue 21kW Combi boiler. Alternatively, click here to email us or 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

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

The Grant VortexBlue 21kW is an option you may wish to consider if you’re looking for a combi boiler for your house or flat.

Boilers traditionally required the installation of one or more large tanks around your property. These were filled with water that was either being heated or was to be heated later. British homes are among the smallest in the world so, to solve the space problem, manufacturers introduced combi boilers in the 1970s to offer homeowners the warmth and hot water supply they needed while taking up much less space.

A combi boiler is designed to heat both radiators and taps on demand and at the same time. Water from the mains passes through a combi boiler and the boiler's technology instantly turns it into hot water. Your boiler then distributes the hot water throughout your home.

The main disadvantage of combi boilers is that they have a maximum water volume capacity. What this means is that, if one person is using the shower while another uses a hot tap simultaneously, less water gets to each area, resulting in a fall in water pressure at both points.

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

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 experienced heating engineers would likely recommend that, at this level of output, this Grant VortexBlue 21kW Combi boiler would be a suitable choice for smaller homes and apartments with up to 10 radiators and one bathroom.

In addition to output rates, you need to consider a combi boiler's flow rate when making your choice.

The flow rate of your boiler dictates the maximum volume of water (measured in litres per minute) that it can heat and distribute to your taps, showers and radiators at any one time.

However, a combi boiler like the Grant VortexBlue 21kW can only heat and deliver water at the rate at which it actually enters your property. For this reason, you should also find out what the mains pressure to your house is before purchasing a boiler.

It's pointless spending more money on a boiler with a 17l/m flow rate if the local water pressure is 11l/m. To give you an indication of average water demand, a power shower typically requires 12 litres of water per minute and a basin tap 4-8 litres. This Grant VortexBlue 21kW Combi boiler's flow rate is 15 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.


What is the size of the Grant VortexBlue 21kW?

The Grant VortexBlue 21kW is 860 mm [H] by 614 mm [W] by 609 mm [D] in size.

Hundreds of thousands of properties still have floor-standing boilers like the Grant VortexBlue 21kW in the UK, although wall-hung boilers are now the obvious choice for most homeowners wanting more living space. It is possible to replace your existing floor-standing boiler with one that is compact if you'd like to but you should consider that much of the pipework will need to be replaced in addition to the cost of the boiler and its installation.

Eventually, your savings on oil bills will pay for the one-time investment but it will take a few years.

If you are considering replacing your current heat only or system boiler with the Grant VortexBlue 21kW, please be aware that this will involve removing your hot water cylinder and/or expansion tank.

For guidance and further information, please contact the team at PlumbProud who will be happy to help you make the right choice.

Grant VortexBlue 21kW – condensing or non-condensing?

The Grant VortexBlue 21kW is a condensing oil 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 oil to warm up the water coming back into your boiler - for example, from your radiators.

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

Is the Grant VortexBlue 21kW combi environmentally friendly?

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.

As much as 14% of the UK’s greenhouse gas production derives from our domestic central heating systems. Gas boilers are responsible for dangerous levels of nitrogen dioxide emissions in Britain's largest 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 in the UK from April 2018 must achieve a SEDBUK “A” grade and an energy efficiency rating of 92% or above. Before that, the minimum was 88% - efficiency ratings of 88% and 89% were scored a “B” and 90%+ an "A".

A boiler's energy efficiency rating describes how much energy it uses and wastes during its standard operation.

The energy efficiency of the Grant VortexBlue 21kW was rated at 90.8% with a SEDBUK grading of "A".

In 2015, new legislation was introduced by the EU to encourage manufacturers to develop more energy-efficient products that emit fewer harmful gases throughout their lifetime.

The Energy Related Products Directive (ERP) applies to all products that consume energy, including during the manufacturing process, at the point of final disposal, and all points in between.

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

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

The parts and labour warranty on the Grant VortexBlue 21kW covers all repair-related costs for 2 years while the heat exchange warranty covers you for [Heat Exchange Warranty] 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
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

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

This Grant VortexBlue 21kW Combi boiler has been rated at 66.98%. Our PlumbProud boiler quality rating system uses price installed, energy efficiency, likely running costs, the manufacturer's warranty and other factors to determine the rating we give.

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.

To receive a free quote on the Grant VortexBlue 21kW and to get professional guidance and advice on whether this Grant VortexBlue 21kW Combi boiler is the right choice for your home, please call us on 01604 343053, enter your postcode in the quote boxes on this page, or 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 this Grant VortexBlue 21kW boiler a combi, system or regular boiler?

Grant’s VortexBlue 21kW is one you might consider if you’re looking for a combi boiler for your house or flat.

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.

Would the Grant VortexBlue 21kW combi be a suitable boiler for my house or flat?

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

This Grant VortexBlue 21kW Combi boiler gets its power from oil and the power it's capable of producing is measured in kilowatts - the output rate is actually a kilowatt rate. The higher the output rate, the more kilowatts a boiler can use when heating water.

If you choose a boiler whose output rate is too low, it may not have enough power to make your water as hot as you would like. If you choose a boiler whose output rate is too high, you won't have to put up with lukewarm water but you will face higher oil bills.

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

With combi boilers like the Grant VortexBlue 21kW, you need to take the flow rate into account as well as the output rate.

Combi boilers draw water from the mains and then instantly heat that water and send it to wherever in your home it's needed. Flow rates, measured in litres per minute, are subject to the mains water pressure in your area. So, for example, if the local mains water pressure is 11 litres per minute and the flow rate of your boiler is 14 litres per minute, the boiler will not be able to process more than 11 litres per minute. The flow rate of this Grant VortexBlue 21kW Combi boiler is 15 L/m.

If you live in a home with lots of radiators or bathrooms where many people want to use hot water at the same time, a combi boiler may not be able to cope. For reference, a power shower uses about 10 litres of water per minute. If two people want showers at the same time or one person wants a shower and the other hot water from a tap in the kitchen, your boiler may not have a large enough flow rate even if the local mains water pressure is high.

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 big is the Grant VortexBlue 21kW?

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

Despite the increase in demand for compact, wall-mounted boilers over the last 20 years, hundreds of thousands of homes still have large floor-standing boilers like the Grant VortexBlue 21kW. If you would like a wall-mounted boiler to replace your existing floor-standing unit to free up space, we can carry out this installation for you but please bear in mind that we may also need to replace your existing pipework, which will add extra costs to the work.

You should however be able to repay your investment in full within a few years with the savings you make on your oil bills.

If you are considering the Grant VortexBlue 21kW as a replacement for your existing heat only or system boiler, you'll also have to budget for the removal of your hot water cylinder and/or your expansion tank.

If you would like professional information and guidance on the best choices for your home, please contact PlumbProud for advice.

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

The Grant VortexBlue 21kW is a condensing oil boiler - in fact, we recommend that you select this model or one of the latest condensing boilers on the market as the technology continues to improve over time.

Condensing boilers capture the heat still present in the flue exhaust gases and water vapour condensation created when the oil is burned and they recycle this back into the heating system to warm up the cold water re-entering the boiler from your radiators.

They're much more environmentally friendly and installing one results in much lower annual oil bills.

Is the Grant VortexBlue 21kW combi an environmentally friendly boiler?

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 Britain's bigger cities, gas boilers, in particular, are responsible for dangerous levels of nitrogen dioxide emissions. Overall, 14% of all of the UK’s greenhouse gas production comes from heating our homes.

Would choosing the Grant VortexBlue 21kW combi help the environment? Let's see what the statistics suggest.

All boilers manufactured and installed in the UK are required by law to have an energy efficiency rating of at least 92%, equivalent to a good “A” rating on the SEDBUK scale. Before this, the minimum was 88% (ratings of 88% and 89% are equivalent to a high “B” SEDBUK rating and anything 90% or higher is an "A" rating).

A boiler's energy efficiency rating is designed to let you know how much energy is used and wasted during normal functioning.

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

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

The aim is to encourage companies to create environmentally friendlier products that reduce harmful gas emissions during manufacturing and when in use by the end client, right through to their eventual disposal.

In the case of the Grant VortexBlue 21kW, the ERP rating is "A" for heat and "A" for hot water production.

If the Grant VortexBlue 21kW combi boiler breaks down, am I covered?

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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