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Worcester Bosch Greenstar Heatslave II 25/32 boiler

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Plumbproud rating

75.83%

Worcester Bosch Greenstar Heatslave II 25/32 Combi Oil boiler

This Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler has been rated at 75.83%. 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.

Provided the proposed installation is straightforward, we would anticipate that this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler will cost £3,800 fully installed through PlumbProud.

We recommend that you speak to our friendly advisors by calling 01604 343053 to seek professional advice on whether the Worcester Bosch Greenstar Heatslave II 25/32 boiler is right for your home. Our team can also provide you with a free quotation for this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler. Alternatively, click here to email us or enter your postcode into the quotation box on this page.


Installed price around

£3,800

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

Is this Worcester Bosch Greenstar Heatslave II 25/32 boiler a combi, system or regular boiler?

Looking for a oil combi boiler for your flat or house? Then the Worcester Bosch Greenstar Heatslave II 25/32 may be an option you should consider.

Traditional boilers need one or more large tanks to work - one to heat and keep water warm for immediate use and the other to store water intended for heating later. Finding space for these large tanks is difficult in British residential property - remember that our houses and flats are among the smallest in the world. This is the problem that combi boilers were designed to solve when they were introduced in the 1970s.

Combi boilers don't need a tank - instead, they instantly heat water drawn from the mains using technology inside the boiler. This hot water is then distributed immediately to your taps or radiators on demand.

The biggest disadvantage to combi boilers is that they have a maximum capacity for heating water, meaning that they work best when only one point within a household wants hot water. For example, if someone is taking a shower and another person uses a hot water tap at the same time, the water pressure, volume and temperature to both points drops.

Is the Worcester Bosch Greenstar Heatslave II 25/32 combi boiler from the Greenstar Heatslave II range a suitable choice for my house or flat?

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

Your boiler's output indicates the maximum amount of power available to it to heat the water you need to warm your radiators or when you want hot water from your taps. A higher output rate means that your boiler is capable of heating greater volumes of water.

If a boiler's output rate is too low, you'll often find that the water is not as hot as you want it to be. Too high, however, and you'll end up paying more for your oil than you should be.

The Worcester Bosch Greenstar Heatslave II 25/32 combi boiler has an output rate of 32 kW, so which types of property would this be suitable for?

An experienced PlumbProud Gas Safe boiler installer would recommend that this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler is appropriate for 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 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 25/32 size

The Worcester Bosch Greenstar Heatslave II 25/32 measures 855 mm tall, 520 mm wide, and 600 mm deep.

Compact wall-mounted boilers have been the models of choice for most homeowners over the last 20 years. But many thousands of properties in the UK still have a floor-standing boiler like the Worcester Bosch Greenstar Heatslave II 25/32. If you're interested in switching to a wall-mounted unit to create extra space in your property, bear in mind that there might be a premium on the installation work because you may need to replace your current piping.

Newer compact boilers mean lower oil bills and you could recover the cost of your investment from those savings within a few years.

You will also need to remove your hot water cylinder and/or expansion tank if you replace your current heat only or system boiler with the Worcester Bosch Greenstar Heatslave II 25/32.

Please get in touch with PlumbProud for information and advice on how to proceed and we'll provide you with our recommendations.

Worcester Bosch Greenstar Heatslave II 25/32 – non-condensing or condensing?

Condensing oil boilers like the Worcester Bosch Greenstar Heatslave II 25/32 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 Worcester Bosch Greenstar Heatslave II 25/32 combi boiler good for the environment?

How we heat our homes is an issue which many homeowners worry about as the world combats climate change and environmental damage.

14% of the UK’s greenhouse gas production comes from central heating. In the bigger cities, gas boilers in particular are responsible for dangerous levels of nitrogen dioxide emissions.

Is the Worcester Bosch Greenstar Heatslave II 25/32 combi an environmentally friendly choice for your home? Let’s have a look at the figures.

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 Worcester Bosch Greenstar Heatslave II 25/32 was awarded an efficiency rating of 91% with a SEDBUK band rating of "A".

The ERP, short for the Energy Related Products Directive, is a European directive aimed at encouraging manufacturers to create products that are environmentally friendlier at all stages, including during manufacturing, when the product is in active use, right through to the point of final disposal.

The Worcester Bosch Greenstar Heatslave II 25/32 has a rating of "A" for heat and "B" for hot water production.

How long is the warranty offered by the manufacturer for the Worcester Bosch Greenstar Heatslave II 25/32 boiler?

The parts and labour warranty offered with this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler covers you for 2 years.


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

Powered by GasOil
LocationExternal
Condensing?Yes
Efficiency rating91%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW32 kW
Height855 mm
Width520 mm
Depth600 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 25/32 boiler

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Worcester Bosch Greenstar Heatslave II 25/32 Combi Oil boiler

  1. Home
  2. Worcester Bosch Greenstar Heatslave II 25/32
Plumbproud rating for this boiler
75.83%

Our PlumbProud quality scoring system considers important factors like energy efficiency, the length of a manufacturer’s guarantee, likely running costs, and installed price to determine a boiler's value for money. This model has received 75.83% from our engineers.

We estimate that this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler will cost £3,800 fully installed through PlumbProud provided that the fit is straightforward.

To receive a free quote on the Worcester Bosch Greenstar Heatslave II 25/32 boiler, as well as professional advice on whether it will meet the needs of your home, simply enter your postcode in the quote box on this page, click here to email us, or call 01604 343053.


Installed price guideline
£3,800

Get your free quote

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

Powered by GasOil
LocationExternal
Condensing?Yes
Efficiency rating91%
Band ratingA
LPG Compatible?No
P/L Warranty2 Years
Output in kW32 kW
Height855 mm
Width520 mm
Depth600 mm
MountingFloor
Flow rate22 L/m
ERP HeatA
ERP WaterB

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

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

The Worcester Bosch Greenstar Heatslave II 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 25/32 combi boiler from the Greenstar Heatslave II range 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, 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 25/32 combi's output at 32 kW, which types of property would this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler be most appropriate for?

A heating engineer would recommend that this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler would be a suitable installation choice for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

Please remember to consider "flow rates" as well when choosing your new boiler. All combi boilers including the Worcester Bosch Greenstar Heatslave II 25/32 draw water from the mains.

Each combi boiler has its own flow rate (measured in litres per minute) - this tells you how much water it can heat and distribute to your home’s taps and radiators straight from the mains. This Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler's flow rate is 22 L/m.

There is no benefit to you in choosing a combi with a high flow rate if your mains pressure is low - save money by buying a boiler whose flow rate is equal to or slightly more than the pressure in your water pipes.

In addition, if you have a lot of radiators and bathrooms in your home or you have a large household that often uses lots of hot water at the same time, like for regular morning and evening showers, 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.


What dimensions does a Worcester Bosch Greenstar Heatslave II 25/32 have?

The Worcester Bosch Greenstar Heatslave II 25/32 boiler measures 855 mm [H] x 520 mm [W] x 600 mm [D] in size.

Over the last 20 years, most homeowners in the UK have shifted from floor-standing boilers like the Worcester Bosch Greenstar Heatslave II 25/32 to more compact, wall-hung units to free up space. You can replace your existing floor-standing boiler with a compact but you should be aware that much of the pipework might need replacing in addition to the cost of the boiler and installation.

There will be a significant one-time investment here - the savings on your oil bills will eventually pay for it but this will take a few years.

It is also important to keep in mind that if you plan to replace an existing heat only or system boiler with the Worcester Bosch Greenstar Heatslave II 25/32, your hot water cylinder and/or expansion tank will need to be removed.

Feel free to contact PlumbProud for information and guidance and we'll be happy to provide it.

Is the Worcester Bosch Greenstar Heatslave II 25/32 condensing or non-condensing?

Condensing oil boilers like the Worcester Bosch Greenstar Heatslave II 25/32 are environmentally friendlier and cheaper to run so, if possible, we strongly recommend that you choose this or one of the very latest models.

Condensing boilers are much more efficient and economical to run because they contain a secondary heat exchanger that captures and recycles the warmth still present in the flue exhaust gases and the water vapour condensation for re-use, meaning that they use less oil to run.

Is the Worcester Bosch Greenstar Heatslave II 25/32 combi an environmentally friendly boiler?

How we heat our homes has become a major issue for many people worried about climate change and environmental issues in general.

About 14% of the greenhouse gases we produce in the UK come from the power needed for central heating. In bigger British cities, gas boilers are a significant source of nitrogen dioxide emissions.

Do the available figures suggest that installing the Worcester Bosch Greenstar Heatslave II 25/32 combi in your property would be an environmentally friendly choice?

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 25/32 was rated at 91% with a SEDBUK grading of "A".

The Energy Related Products Directive (ERP) is European legislation that applies to all products which use or consume energy during their lifespan, including during the manufacturing process and when they're in actual use, right through to the point of final disposal.

The aim is to encourage manufacturers to create new products that are kinder to the environment and create fewer harmful gas emissions.

The Worcester Bosch Greenstar Heatslave II 25/32 has an ERP Heat rating of "A" and an ERP Water rating of "B".

If the Worcester Bosch Greenstar Heatslave II 25/32 breaks down, will I be covered by the warranty?

Parts and labour charges incurred during a repair on the Worcester Bosch Worcester Bosch Greenstar Heatslave II 25/32 boiler are covered by a 2 year warranty.


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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