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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

On the PlumbProud boiler quality benchmark scoring system, we have rated this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler at 75.83%. Ratings are determined by considering a number of important factors including the energy efficiency, price installed, warranty length, and running costs of the boiler.

On most non-complicated installations, we would expect this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler to cost £3,800 including installation if you choose PlumbProud to do the work.

To contact us, please enter your postcode in the quote boxes on this page, click here to email us, or give us a call on 01604 343053. We can provide you with a free quote on the Worcester Bosch Greenstar Heatslave II 25/32 boiler and offer professional advice and guidance on whether this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler is the right choice for your home.


Installed price around

£3,800

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

What type of boiler is Worcester Bosch’s Greenstar Heatslave II 25/32 - system, regular or combi?

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

A combi boiler could be a better choice than a standard boiler if space is at a premium in your home. Combi boilers draw water directly from the mains supply and heat it instantly, removing the need for a hot water cylinder and a cold water tank.

Water is heated on demand and then distributed directly to your taps and showers. This means that combi boilers use less fuel and so reduce your oil bills.

The main disadvantage to combi boilers is that they can only heat a limited volume of water at any given time. If more than one tap or shower is in use, the hot water supply to both could be restricted and both the water pressure and temperature will drop.

Is the Worcester Bosch Greenstar Heatslave II 25/32 combi boiler suitable for my house or apartment?

Selecting the right boiler for your home means choosing 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".

Your boiler’s output is a measurement of the power it has available to it to heat the water you need for your radiators or for when you turn on a tap, bath or shower. A higher output rate means it has more power and can heat more water.

It's important to choose an output that matches the demand for water in your home because if your boiler has too low an output, you'll often find only lukewarm water comes out of your taps or heats your radiators. If it’s too high, you’ll be paying more for your oil than you need to.

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

An experienced heating engineer would recommend that the Worcester Bosch Greenstar Heatslave II 25/32 combi boiler is a suitable choice for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

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 Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler's flow rate is 22 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 size is the Worcester Bosch Greenstar Heatslave II 25/32 boiler?

The Worcester Bosch Greenstar Heatslave II 25/32 is 855 mm high by 520 mm wide by 600 mm deep.

Many homeowners still have floor-standing boilers like the Worcester Bosch Greenstar Heatslave II 25/32 even though wall-mounted boilers have been the preferred choice because of their compact size. If you want to replace your existing boiler with a compact wall-hung one to free up extra living space for you and your family, we can do this for you but please be aware that we may need to replace much of your existing pipework, which will incur an additional charge.

However, given the efficiency of modern wall-mounted oil boilers, the savings you make on your energy bills over the coming years should more than repay the cost of your investment.

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 non-condensing or condensing?

We always recommend to clients that they select the very latest condensing boiler for their home.

Condensing boilers like the Worcester Bosch Greenstar Heatslave II 25/32 are more efficient with the oil they use in operation, meaning that you'll benefit from lower fuel bills. Condensing boilers are also better for the environment.

They achieve their efficiency by capturing and recycling the heat still present in the water vapour condensation and flue exhaust gases created when a boiler burns oil to get the energy it needs. It then reuses that recycled heat to perform a number of tasks, including heating the colder water that comes back to your boiler via the radiator.

How does the Worcester Bosch Greenstar Heatslave II 25/32 combi boiler rate environmentally?

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

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.

Would installing a Worcester Bosch Greenstar Heatslave II 25/32 combi boiler in your home be a green choice? Let's look at the numbers.

All new British boilers must perform to a legal minimum energy efficiency of 92% (a low to good SEDBUK "A" rating). Prior to April 2018, the target was 88% (86-90% = SEDBUK "B" and 90%+ = SEDBUK "A").

Efficiency ratings are intended to let consumers know how much energy a boiler uses in its day-to-day activities and how much energy goes to waste.

The Worcester Bosch Greenstar Heatslave II 25/32 was awarded an efficiency rating of 91%, equivalent to a SEDBUK grade 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 Worcester Bosch Greenstar Heatslave II 25/32, the ERP rating is "A" for heat and "B" for hot water production.

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

The Worcester Bosch Greenstar Heatslave II 25/32 is supplied with a parts and labour warranty of 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%

We scored this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler at 75.83% 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 would expect that, unless there are complications during fitting, this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler would cost £3,800 supplied and professionally installed through PlumbProud.

If you would like a free quote and professional advice and guidance to help you decide if the Worcester Bosch Greenstar Heatslave II 25/32 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
£3,800

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

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

The Worcester Bosch Greenstar Heatslave II 25/32 may be worth considering if you are looking for a combi boiler for your house or flat.

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 a Worcester Bosch Greenstar Heatslave II 25/32 combi boiler right for my house or apartment?

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".

Your boiler should be able to cope with peak hot water demand in your property and not just your average hot water usage. The output rate of a boiler is measured in kilowatts and tells you how much power a boiler can use to provide hot water to your taps, showers and radiators.

If the output of your boiler is too low, there will often be times when your water isn't as hot as you want. But if your boiler output is too high, it will be more costly to run (often unnecessarily).

The output of the Worcester Bosch Greenstar Heatslave II 25/32 combi boiler is 32 kW kilowatts. Which types of property would this be appropriate for?

Most experienced boiler engineers would recommend that this Worcester Bosch Greenstar Heatslave II 25/32 Combi boiler would be suitable 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 size of the Worcester Bosch Greenstar Heatslave II 25/32 boiler is 855 mm high, 520 mm wide, and 600 mm deep.

Many homes in the UK still have floor-standing boilers like the Worcester Bosch Greenstar Heatslave II 25/32, even though wall-hung boilers have become the product of choice for most homeowners over the last 20 years. If you'd like to replace your existing floor-standing boiler with a compact, wall-mounted boiler to create more space for you and your family, please bear in mind that your pipework may need to be replaced in addition to the cost of the boiler and its installation.

Savings on your oil bills will eventually completely pay for the one-time investment but it will take a few years.

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

Please contact PlumbProud for information and guidance on the best course of action.

Is this Worcester Bosch boiler condensing or non-condensing?

The Worcester Bosch Greenstar Heatslave II 25/32 is a condensing oil boiler - where possible, we always recommend to clients that they choose one of the very latest condensing boilers to take advantage of this technology, which improves year after year.

Condensing boilers are more energy-efficient as they capture and recycle the heat contained in flue exhaust gases and water vapour condensation. They then use this heat to perform tasks like warming up colder water returning to the boiler from the radiators.

By choosing a condensing boiler, you'll help the environment as well as save money on your oil bills.

How does the Worcester Bosch Greenstar Heatslave II 25/32 combi rate environmentally?

With environmental issues in the spotlight, more and more homeowners are becoming concerned about how they heat their homes and how much they're contributing towards combatting climate change.

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 figures suggest that installing the Worcester Bosch Greenstar Heatslave II 25/32 combi at your property would help in the fight against climate change?

Boilers manufactured or supplied to UK domestic properties must achieve a legal minimum energy efficiency rating of 92% (equivalent to a good "A" grade using the SEDBUK scale). Prior to this, the minimum was 88% (88% and 89% are a "B" SEDBUK grade and anything 90% or above is an "A" grade).

The energy efficiency rating of a boiler refers to the amount of energy it uses to perform its everyday functions as well as the amount of energy it wastes.

The Worcester Bosch Greenstar Heatslave II 25/32 has been given a rating of 91% for energy efficiency, equivalent to a SEDBUK "A" rating.

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 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 25/32 combi boiler?

You receive a parts and labour warranty of 2 years with the Worcester Bosch Greenstar Heatslave II 25/32 boiler.


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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