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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%.

We estimate that this Grant VortexBlue 21kW Combi boiler will cost £3,900 fully installed through PlumbProud provided that the fit is straightforward.

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

What type of boiler is Grant’s VortexBlue 21kW - system, regular or combi?

If you are searching for a combi boiler for your house or flat, the Grant VortexBlue 21kW is certainly one to consider.

Combi boilers are excellent for providing hot water and heat for your radiators just when you need it. When you have a combi boiler installed in your home, you just turn on the tap and the hot water for your bath, shower, washing dishes and other activities is there when you need it. It also provides the heat you need to keep your radiators warm.

A combi boiler heats the cold water passing through it, which it draws from the mains. This newly heated water can then be distributed to whichever hot tap or radiator needs it.

In the past, boilers needed at least one storage tank to hold water that was either already heated or would be heated later. Sometimes, you'd have to wait for hot water because there was none left. In addition, storage tanks took up a lot of space and most UK homes are pretty small.

The main disadvantage to combi boilers is that they can only heat a certain amount of water at any one time, meaning the pressure, volume and temperature of water will decrease if more than one tap is on at the same time or if both the shower and washing machine are on together.

Is the Grant VortexBlue 21kW combi boiler the right choice for my house or apartment?

Whether this Grant VortexBlue 21kW 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 VortexBlue 21kW combi outputs at a maximum of 21 kW, so which types of property would this Grant VortexBlue 21kW Combi boiler 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.

With all combi boilers, the "flow rate" (measured in litres per minute) is as important a consideration as output rate when choosing which model to go for. This Grant VortexBlue 21kW Combi boiler's flow rate is 15 L/m.

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.

However, the water in the mains pipe that feeds your boilers has its own flow rate - normally between 10 and 12l/m. So if you choose a combi with a flow rate of 14l/m but local water pressure is equivalent to 11l/m, your boiler will actually operate at 11l/m - below its capacity.

In addition, if different family members want hot water at the same time (like for regular morning and evening showers) and your boiler has to provide hot water to your radiators at the same time, a combi boiler may not be suitable.

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.


Where will the Grant VortexBlue 21kW fit in my house?

The dimensions of the Grant VortexBlue 21kW are 945 mm tall, 658 mm wide, and 966 mm deep.

4% of the British population rely on oil-powered boilers for hot water and central heating - the Grant VortexBlue 21kW is an external, floor-standing combi boiler which runs on oil.

For homeowners concerned about the possibility of oil leakages inside their homes, external boilers provide protection against both indoor oil damage from leakage and the unpleasant and hard-to-shift odours those leaks create. They are supplied with weatherproof housing so can function in all weathers, and they're also much easier for a service engineer to work on.

VortexBlue 21kW – non-condensing or 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.

Is the Grant VortexBlue 21kW combi considered environmentally friendly?

Many homeowners are now worried about climate change and the damage they do to the environment from heating their homes has become a subject of increasing concern.

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 installing the Grant VortexBlue 21kW combi in your home be an environmentally friendly decision? Let's look closely at the figures.

The Grant VortexBlue 21kW 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.

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.

Am I covered if the Grant VortexBlue 21kW combi boiler breaks down?

The Grant VortexBlue 21kW is covered by a parts and labour warranty of 2 years following installation.


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

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

On the PlumbProud quality scoring system, we rate this Grant VortexBlue 21kW Combi boiler 66.99%. 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.

You should budget approximately £3,900 for the supply and installation of this Grant VortexBlue 21kW Combi boiler on a standard, non-complicated fit.

We offer free quotes and professional advice and guidance on whether the Grant VortexBlue 21kW is a suitable choice for your home via a phone call on 01604 343053. Alternatively, please click here to email us or enter your postcode in the quote boxes on this page.


Installed price guideline
£3,900

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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

What type of boiler is Grant’s VortexBlue 21kW - system, regular or combi?

If you are searching for a combi boiler for your house or flat, the Grant VortexBlue 21kW is certainly one to consider.

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.

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

You should make sure that the boiler you install in your property 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 has to be powerful enough to heat all the hot water you need for your radiators and taps. Power is measured in kilowatts and the more kilowatts a boiler has available to it, the more water it can heat.

If the output (measured in kilowatts) is too high, you'll have all the power you need and more but your oil bills will be much higher. If it's too low, you'll often find that the water coming out of your taps and fed into your radiators is only lukewarm.

With the Grant VortexBlue 21kW combi's output at 21 kW, which types of property would this Grant VortexBlue 21kW Combi boiler be most appropriate for?

An experienced PlumbProud heating engineer would recommend that the level of output from this Grant VortexBlue 21kW Combi boiler would make it a suitable installation option 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.


What size is the Grant VortexBlue 21kW boiler?

The Grant VortexBlue 21kW measures 945 mm high and 658 mm wide by a depth of 966 mm.

The Grant VortexBlue 21kW is an external floor-standing combi boiler which will be installed outside of your home. Other than providing you with more indoor space and reduced noise, it’s much easier for a service engineer to access it if it goes wrong and there’s also a lower risk of carbon monoxide leaking into your home.

Boilers like the Grant VortexBlue 21kW are shielded in weatherproof housing and because the oil is outside your home, there is less chance of oil leakage, which can cause damage and odours that are hard to remove.

Grant VortexBlue 21kW – non-condensing or condensing?

Condensing oil boilers like the Grant VortexBlue 21kW are more energy-efficient and choosing one for your home will cut the amount you pay every year for your oil.

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.

Is the Grant VortexBlue 21kW combi boiler environmentally friendly?

How we heat our homes has become a pressing issue of concern for many homeowners worried about climate change and the environmental impact of their personal choices.

Central heating creates 14% of the UK’s greenhouse gases. And in Britain's larger cities, gas boilers are responsible for dangerous levels of nitrogen dioxide emissions.

Is the Grant VortexBlue 21kW combi an environmentally friendly choice for your home? Let’s have a look at the figures.

Under current UK law, all boilers must achieve a minimum energy efficiency level of 92% (a low to good SEDBUK "A" rating). The minimum level was raised from its previous 88% in April 2018.

Energy efficiency scores are intended to inform consumers of the amount of energy used and wasted when a boiler is in normal operation.

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

The aim of the Energy Related Products (ERP) Directive is to reduce the harmful gas emissions created during a product’s manufacture and active end use right through to its disposal.

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

How long is the warranty period on the Grant VortexBlue 21kW combi boiler?

The Grant VortexBlue 21kW boiler comes with a 2 year warranty for parts and labour.


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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