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Worcester Bosch Greenstar Heatslave II External 25/32 boiler

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Plumbproud rating

75.58%

Worcester Bosch Greenstar Heatslave II External 25/32 Combi Oil boiler

On the PlumbProud quality scoring system, we rate this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler at 75.58%. To determine a boiler's quality, we consider many different factors from price installed to manufacturer guarantees, energy efficiency, likely cost of running, and more.

We anticipate the supply and installation cost for this model of boiler will be around £4,000 on a standard fit.

Please enter your postcode in the quote boxes on this page, email us, or call us on 01604 343053 to get a free quote and guidance on whether the Worcester Bosch Greenstar Heatslave II External 25/32 boiler is the right choice for your home.


Installed price around

£4,000

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Worcester Bosch Greenstar Heatslave II External 25/32 Combi Oil boiler frequently asked questions

Which category of boiler does the Worcester Bosch Greenstar Heatslave II External 25/32 fit into?

The Worcester Bosch Greenstar Heatslave II External 25/32 is worthy of consideration if you're looking for a combi boiler for your flat or house.

In the past, most boilers needed one or more storage tanks to operate - one to store warm water and the other for storing water to be heated later. But storage tanks are problematic in properties where space is at a premium and particularly where there is no loft. Many properties in the UK are small and so manufacturers introduced combi boilers in the 1970s to eliminate the need for tanks.

With a combi boiler, the hot water for your radiators and taps is delivered on demand. The boiler instantly heats water it draws directly from the mains internally. It then distributes the heated water around your home at mains pressure as you need it.

It is important to bear in mind that, while combi boilers have many benefits, they can only heat a certain volume of water at any given time. This means that, if you run a shower at the same time as someone else is doing the washing up in the kitchen, the volume of water passing to each point will drop, causing a fall in pressure.

Is the Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler a suitable choice for my property?

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 Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler has an output of 32 kW, so which types of property would it be most appropriate for?

Most experienced heating engineers would suggest that the most suitable type of property for installing a Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler in would be medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

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 Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler is 22 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.


Worcester Bosch Greenstar Heatslave II External 25/32 size

The Worcester Bosch Greenstar Heatslave II External 25/32 boiler is 950 mm high, 640 mm wide, and 770 mm deep.

Floor-standing external combi boilers like the Worcester Bosch Greenstar Heatslave II External 25/32 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 Worcester Bosch Greenstar Heatslave II External 25/32 condensing or non-condensing?

We strongly recommend that you choose a condensing boiler like the Worcester Bosch Greenstar Heatslave II External 25/32 - 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 Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler?

As more of us become concerned by the effects of climate change, the damage we do to the environment by heating our homes has emerged as an important issue for 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.

Would choosing the Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler be an environmentally friendly decision? Here's what the figures say.

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 Worcester Bosch Greenstar Heatslave II External 25/32 was rated at 90% with a SEDBUK grading of "A".

The ERP (or Energy Related Products Directive) is a European regulation governing products which require energy to operate throughout their lives and encourages manufacturers to create products that are more environmentally friendly.

The legislation is designed to reduce the potential for harmful gas emissions during manufacturing and actual use right through to the point of final disposal.

For the Worcester Bosch Greenstar Heatslave II External 25/32, the ERP rating is "A" for heat and "B" for hot water production.

What is the warranty period on a Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler?

The Worcester Bosch Greenstar Heatslave II External 25/32 boiler has a warranty covering parts and labour costs for up to 2 years after installation.


Worcester Bosch Greenstar Heatslave II External 25/32 Oil Combi boiler specifications

Powered by GasOil
LocationExternal
Condensing?Yes
Efficiency rating90%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW32 kW
Height950 mm
Width640 mm
Depth770 mm
MountingFloor
Flow rate22 L/m
ERP HeatA
ERP WaterB

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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Worcester Bosch Greenstar Heatslave II External 25/32 boiler

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Worcester Bosch Greenstar Heatslave II External 25/32 Combi Oil boiler

  1. Home
  2. Worcester Bosch Greenstar Heatslave II External 25/32
Plumbproud rating for this boiler
75.58%

Using the PlumbProud boiler quality scoring system, we have rated this model at 75.58%. To determine the rating, we factor in the price installed, energy efficiency, running costs, the warranty offered, and more.

We would anticipate that this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler would cost you £4,000 fully installed through PlumbProud provided that the fitting is standard and with no complications.

Get a free quote on the Worcester Bosch Greenstar Heatslave II External 25/32 boiler and advice on whether this is the right choice for your home by entering your postcode in the quote box on this page, clicking here to email us, or giving us a call at 01604 343053.


Installed price guideline
£4,000

Get your free quote

Worcester Bosch Greenstar Heatslave II External 25/32 Oil Combi boiler specifications

Powered by GasOil
LocationExternal
Condensing?Yes
Efficiency rating90%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW32 kW
Height950 mm
Width640 mm
Depth770 mm
MountingFloor
Flow rate22 L/m
ERP HeatA
ERP WaterB

Worcester Bosch Greenstar Heatslave II External 25/32 Combi Oil boiler frequently asked questions

Is the Worcester Bosch Greenstar Heatslave II External 25/32 a standard, combi or system boiler?

If you’re looking for a combi boiler for your house or flat, then the Worcester Bosch Greenstar Heatslave II External 25/32 is one you may wish to consider.

In the past, most boilers needed one or more storage tanks to operate - one to store warm water and the other for storing water to be heated later. But storage tanks are problematic in properties where space is at a premium and particularly where there is no loft. Many properties in the UK are small and so manufacturers introduced combi boilers in the 1970s to eliminate the need for tanks.

With a combi boiler, the hot water for your radiators and taps is delivered on demand. The boiler instantly heats water it draws directly from the mains internally. It then distributes the heated water around your home at mains pressure as you need it.

It is important to bear in mind that, while combi boilers have many benefits, they can only heat a certain volume of water at any given time. This means that, if you run a shower at the same time as someone else is doing the washing up in the kitchen, the volume of water passing to each point will drop, causing a fall in pressure.

Is the Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler a suitable option 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 Worcester Bosch Greenstar Heatslave II External 25/32 combi's output at 32 kW, which types of property would this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler be most appropriate for?

Most experienced heating engineers would suggest that the most suitable type of property for installing a Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler in would be medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

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 Worcester Bosch Greenstar Heatslave II External 25/32 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 Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler's flow rate is 22 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 dimensions does a Worcester Bosch Greenstar Heatslave II External 25/32 have?

The Worcester Bosch Greenstar Heatslave II External 25/32 measures 950 mm high and 640 mm wide by a depth of 770 mm.

If you would like to reduce the space your boiler takes up in your home or you don't like the noise of an internal oil heater, you may want to consider the Worcester Bosch Greenstar Heatslave II External 25/32 - an external combi boiler which is fitted outside your property.

Supplied in sturdy weatherproof housing designed to resist rusting and water ingress, an external boiler is much easier for a service engineer to work on if there is a fault or it needs repairing. External boilers also reduce the risk of carbon monoxide leakages inside your home.

Is this Worcester Bosch boiler condensing or non-condensing?

We recommend that, if possible, you choose a condensing boiler like the Worcester Bosch Greenstar Heatslave II External 25/32.

Condensing boilers are more energy-efficient. They achieve this efficiency by capturing the heat present in flue exhaust gases and water vapour condensation and recycling that heat to, for example, warm colder water coming back from your radiators.

By choosing the latest condensing boiler, you'll also notice a significant reduction in your oil bills, particularly if you're replacing a boiler more than 15 years old.

What energy efficiency ratings have been awarded to the Worcester Bosch Greenstar Heatslave II External 25/32 combi?

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.

Is the Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler an environmentally friendly choice for your home? Here’s what the figures say.

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 Worcester Bosch Greenstar Heatslave II External 25/32 was given an efficiency rating of 90% and a band rating of "A".

The ERP (Energy Related Products Directive) applies to all products that consume energy at any time in their lifetime, from manufacture to disposal and all points in between.

This European legislation intends to encourage manufacturers to offer end users products that are better for the environment through the creation of fewer harmful gas emissions at all points of a product's life cycle.

The ERP rating for the Worcester Bosch Greenstar Heatslave II External 25/32 is "A" for heat and "B" for water.

What warranty does the Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler come with?

The Worcester Bosch Greenstar Heatslave II External 25/32 boiler is covered by a parts and labour warranty of 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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