GET A COMPETITIVE QUOTE

Please enter your postcode below to get a free, no obligation, personalised quotation from PlumbProud

Grant Vortex Pro 21 boiler

  1. Home
  2. Grant Vortex Pro 21
Plumbproud rating

67.31%

Grant Vortex Pro 21 Combi Oil boiler

Based on a wide-ranging set of important factors including the cost to install the boiler, its energy efficiency rating, running costs, and so on, this Grant Vortex Pro 21 Combi boiler receives a score of 67.31% on our PlumbProud quality scoring system.

On straightforward installations, we would expect to charge you £3,700 for this Grant Vortex Pro 21 Combi boiler fully installed.

To get a free quote for the installation of the Grant Vortex Pro 21 boiler in your home, simply enter your postcode in the box provided on this page. You can also find out whether this is the right boiler for your home by clicking to email our installation team or by calling us on 01604 343053.


Installed price around

£3,700

GET A COMPETITIVE BOILER QUOTE

Please enter your postcode below to get a personalised quotation for the perfect boiler for your home

Grant Vortex Pro 21 Combi Oil boiler frequently asked questions

Is the Grant Vortex Pro 21 a system, regular or combi boiler?

If you’re looking for a combi boiler for your house or flat, you may wish to the consider the Grant Vortex Pro 21.

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 Grant Vortex Pro 21 combi suitable 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 - its "output".

The output rate tells you how much energy your boiler has to use to provide you and your family with hot water and central heating. A higher output rate means that it can heat greater volumes of water.

Please be aware, though - if you choose a boiler whose output is too low, the water in your radiators and coming from your taps may not be warm enough. Conversely, if you choose a boiler with too high an output, you'll pay more for oil than is necessary.

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

An experienced PlumbProud boiler engineer would likely recommend this Grant Vortex Pro 21 Combi boiler as suitable for smaller homes and apartments with up to 10 radiators and one bathroom.

As well as the output rate, you need to consider "flow rate" when choosing a combi boiler.

The flow rate describes how much water a combi boiler can draw from the mains, instantly heat, and then send to your radiators. Flow rates are measured in litres per second and this Grant Vortex Pro 21 Combi boiler's flow rate is 15 L/m.

The water in your mains pipe also has its own flow rate - normally between 10 and 12l/m in most parts of Britain. This means that, if you choose a combi boiler with a flow rate of 17l/m where local water pressure is 11lm, it won't actually process more water because of the slower flow rate of the mains.

In addition, larger households with more than one bathroom, multiple radiators, and where family members may want to use hot water at the same time (like morning showers) may actually need a boiler with a higher flow rate than either the boiler or the local mains pipe.

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 Vortex Pro 21 boiler?

The Grant Vortex Pro 21 measures 945 mm in height by 658 mm in width by 754 mm in depth.

External, floor-standing combi boilers like the Grant Vortex Pro 21 don't require you to find space in your home for them and, because they're outside, you'll never hear them working unless you're out in the garden.

They provide much easier access for a heating engineer in case of a fault and their sturdy waterproof covering can handle the British climate as well as prevent rusting and water ingress.

Other benefits include the fact that gas will disperse into the atmosphere outdoors in the event of a carbon monoxide leak. The chances of an oil leak damaging your property are also greatly reduced because the boiler is not installed inside your property.

Is the Grant Vortex Pro 21 a non-condensing or condensing boiler?

We strongly recommend that you choose a condensing boiler like the Grant Vortex Pro 21 - 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 Vortex Pro 21 combi boiler?

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.

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.

Will choosing to install a Grant Vortex Pro 21 combi in your home help the environment? Let's review the figures.

The Grant Vortex Pro 21 has been awarded an efficiency rating of 90.8% and a SEDBUK band rating of "A".

In the UK, all boilers manufactured and supplied must have an energy efficiency rating of at least 92% or a SEDBUK "A" grade. Until April 2018, the minimum rating was 88% (88% and 89% are equivalent to a SEDBUK "B" rating and anything higher is rated "A").

A boiler's energy efficiency rating describes the amount of energy it uses and wastes when in normal operation.

All products that consume energy throughout their lifespan must comply with the Energy Related Products (ERP) Directive.

Companies are legally obliged to reduce harmful gas emissions at all stages of a product's life cycle, from initial manufacturing right through to final disposal as well as when the product is in actual use.

The Grant Vortex Pro 21 scores "A" for heat and "A" for water.

What is the length of the warranty on the Grant Vortex Pro 21?

Parts and labour charges incurred for repairs made to your new Grant Vortex Pro 21 are covered by a 2 year warranty.


Grant Vortex Pro 21 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
Depth754 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%

Combi boilers

Choose from the UK’s biggest range of combis

Heat only boilers

The ideal boiler perfect for the largest homes

System boilers

Ideal for 3+ bedroom, 2+ bathroom homes

Boiler quote

Free, no obligation quote from our engineer

Grant Vortex Pro 21 boiler

We will not be beaten on price -
ask us about our PRICE GUARANTEE!

Grant Vortex Pro 21 Combi Oil boiler

  1. Home
  2. Grant Vortex Pro 21
Plumbproud rating for this boiler
67.31%

We scored this Grant Vortex Pro 21 Combi boiler at 67.31% 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.

We estimate that, on a standard, non-complicated installation, the supply and fitting charge for this Grant Vortex Pro 21 Combi boiler will be around £3,700.

If you would like a free quote and professional advice and guidance to help you decide if the Grant Vortex Pro 21 is the right choice for your home, please get in touch. You can do this by entering your postcode in the quote boxes on this page, click here to email us or give us a call on 01604 343053.


Installed price guideline
£3,700

Get your free quote

Grant Vortex Pro 21 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
Depth754 mm
MountingFloor
Flow rate15 L/m
ERP HeatA
ERP WaterA

Grant Vortex Pro 21 Combi Oil boiler frequently asked questions

Is the Grant Vortex Pro 21 boiler a combi, regular or a system boiler?

The Grant Vortex Pro 21 boiler could be suitable for your house or flat if you are looking for a new combi boiler.

Traditional boilers would require you to install one or more storage tanks in your property. These tanks either kept the water warm or stored it for later heating. Manufacturers initially designed and introduced combi boilers to the market to offer homeowners the highest levels of warmth and unlimited hot water without taking up as much space.

Combi boilers provide hot water on demand for your radiators and taps. They take water directly from the mains, heat it immediately as it's needed, and then distribute the hot water around your home.

Combi boilers, however, are limited in terms of how much water they can heat at any given time. For example, if one person wishes to take a shower while another wants to turn on a hot water tap, the amount of water reaching each point drops. This results in a drop in the water pressure as well as the temperature.

Is a Grant Vortex Pro 21 combi boiler right for my house or apartment?

Whether this Grant Vortex Pro 21 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 oil 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 Grant Vortex Pro 21 combi outputs at a maximum of 21 kW, so which types of property would this Grant Vortex Pro 21 Combi boiler be appropriate for?

A boiler engineer would recommend that, at this level of output, the most suitable type of property for this Grant Vortex Pro 21 Combi boiler would be 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 Vortex Pro 21 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 Vortex Pro 21 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.


How large is a Grant Vortex Pro 21 boiler?

The Grant Vortex Pro 21 measures 945 mm tall, 658 mm wide, and 754 mm deep.

Floor-standing external combi boilers like the Grant Vortex Pro 21 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 Vortex Pro 21 condensing or non-condensing?

We strongly recommend that you choose a condensing boiler like the Grant Vortex Pro 21 - 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.

Is the Grant Vortex Pro 21 combi boiler an environmentally friendly choice?

With more and more people concerned about climate change, how we heat our homes and the damage it does to the environment is increasingly being questioned by British homeowners.

With central heating being responsible for 14% of greenhouse gas emissions in the UK, your choice of boiler matters. Gas boilers are also responsible for the significant atmospheric volumes of dangerous nitrogen dioxide emissions in larger British cities.

Would installing a Grant Vortex Pro 21 combi boiler in your home be a green choice? 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 Vortex Pro 21 was rated at 90.8% with 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 Vortex Pro 21 are "A" for heat and "A" for hot water.

Am I covered if the Grant Vortex Pro 21 combi boiler breaks down?

Grant offers a parts and labour warranty of 2 years on the Grant Vortex Pro 21.


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%
Menu