GET A COMPETITIVE QUOTE

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

Worcester Bosch Greenstar Heatslave II External 25/32 boiler

  1. Home
  2. Worcester Bosch Greenstar Heatslave II External 25/32
Plumbproud rating

75.58%

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

Using factors such as price installed, manufacturer guarantees, energy efficiency and the likely cost of running, among others, this model has been rated as scoring 75.58% on the PlumbProud boiler benchmarking system.

We would expect that, unless there are complications during fitting, this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler would cost £4,000 supplied and professionally installed through PlumbProud.

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


Installed price around

£4,000

GET A COMPETITIVE BOILER QUOTE

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

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

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

When looking for a combi boiler for your house or flat, the Worcester Bosch Greenstar Heatslave II External 25/32 might be a suitable option for you.

In many properties, combi boilers are more suitable than traditional types of boiler. Combi boilers heat water instantly on demand, which they draw directly from the mains supply, removing the need for storage tanks that can take up valuable space in your home.

A combi boiler is often the right choice for a smaller property, particularly if your home doesn't have a useable loft. As water is heated and delivered immediately rather than being kept warm for hours in an immersion tank, combi boilers reduce oil usage, thereby minimising your heating costs.

The main disadvantage of combi boilers is that they can only heat a certain amount of water at any one time. This means that, if two people are using different taps or showers within your home at the same time, the flow of heated water to each will be reduced, as will the water pressure and temperature.

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

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 - the "output".

The output of a boiler is measured in kilowatts. The output level determines the maximum power a boiler can use in heating the water needed for the baths, showers, taps and radiators in your home.

It's important to choose a boiler with an appropriate level of output for your property. Your boiler should be able to cope with periods of peak demand in your property and not just your average usage.

An output rate that is too low will result in an inadequate supply of hot water, while an output that is too high will mean the boiler will cost more to run than is necessary.

The output of the Worcester Bosch Greenstar Heatslave II External 25/32 combi is 32 kW kilowatts, so which types of property would this be appropriate for?

A PlumbProud Gas Safe boiler installer would recommend that the level of output from this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler would make it a suitable installation option for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

With combi boilers, flow rates are as important a consideration as output rates.

All combi boilers draw water from the mains. They then heat this water instantly whenever it's needed and distribute it to your radiators and taps.

A boiler's "flow rate" describes how much water a boiler can draw from the mains at any one time, which it then heats and sends around your home (measured in litres per minute). This Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler's flow rate is 22 L/m.

If your home has a large number of radiators, a lot of bathrooms, or multiple people who wish to use the hot water at the same time, your combi boiler may not be able to draw as much water from the mains as it needs to serve everyone, regardless of how high the flow rate is.

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 Worcester Bosch Greenstar Heatslave II External 25/32 boiler?

The Worcester Bosch Greenstar Heatslave II External 25/32 boiler measures 950 mm [H] x 640 mm [W] x 770 mm [D] in size.

Floor-standing external combi boilers like the Worcester Bosch Greenstar Heatslave II External 25/32 are safer as the oil it uses for fuel is not stored inside your home meaning there is little to no chance of an internal leak occurring which can damage your home and leave oily odours that become difficult to eradicate.

External boilers free up space in your home and because they're outside, you rarely hear them working. In addition, a service engineer can quickly fix it if it has problems, and there is a lower chance of carbon monoxide entering your home.

Is this Worcester Bosch boiler condensing or non-condensing?

Because of their increased energy efficiency, we recommend to all customers that they select one of the latest condensing boilers. Condensing boilers capture the heat from water vapour condensation and flue exhaust gases and recycle that heat to warm water entering the boiler (for example, from your radiators).

The Worcester Bosch Greenstar Heatslave II External 25/32 is a condensing oil boiler and choosing this model will result in a likely substantial reduction in your fuel bills, particularly if you're replacing an older, inefficient, non-condensing boiler.

Does the Worcester Bosch Greenstar Heatslave II External 25/32 combi protect the environment?

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.

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.

Would the environmental impact of installing a Worcester Bosch Greenstar Heatslave II External 25/32 combi in your home be positive? 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 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 European legislation which applies to all products that consume energy throughout their lifetime.

Its purpose is to encourage manufacturers to offer products that are kinder to the environment by reducing harmful gas emissions at all stages, from production and end use right through to disposal.

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

Am I covered if the Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler breaks down?

Worcester Bosch offers a parts and labour warranty of 2 years on the Worcester Bosch Greenstar Heatslave II External 25/32.


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%

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

Worcester Bosch Greenstar Heatslave II External 25/32 boiler

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

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%

Assessing factors including the system's running costs, its energy efficiency, the manufacturer’s guarantee, and its likely installed price, we scored this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler 75.58% on our internal PlumbProud grading system.

Fitted by an experienced Gas Safe PlumbProud engineer, the cost for this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler will be in the region of £4,000 on a standard, non-complicated installation.

If you would like a free quote and professional advice and guidance to help you decide if the Worcester Bosch Greenstar Heatslave II External 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
£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 this Worcester Bosch Greenstar Heatslave II External 25/32 boiler a combi, system or regular boiler?

If you are searching for a combi boiler for your house or flat, the Worcester Bosch Greenstar Heatslave II External 25/32 is certainly one to consider.

In older British homes, traditional boilers required you to find room for one or more storage tanks. One tank would keep hot water warm and the other stored cold water for later heating. Manufacturers introduced combi boilers to the UK in the 1970s so that homeowners could get the warmth and hot water they needed without having to sacrifice too much valuable space – remember that residential property in this country is among the smallest in the Western world.

Combi boilers deliver hot water to your radiators and taps using water they draw directly from the mains supply. As mains water travels through a combi boiler, the technology within it heats the cold water instantly and on demand. The hot water is then distributed throughout your house.

Combi boilers have one drawback, however: they can only heat a certain amount of water within a given time. For example, if someone uses the shower and another person uses the hot water tap at the same time, water pressure drops because water reaches each point differently.

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

An experienced Gas Safe boiler installer would recommend that the Worcester Bosch Greenstar Heatslave II External 25/32 combi boiler would be an ideal installation option for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

If you are thinking about installing a combi boiler like the Worcester Bosch Greenstar Heatslave II External 25/32 in your home, you should consider flow rates as well as output rates. This Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler's flow rate is 22 L/m.

The flow rate indicates the maximum volume of water (measured in litres per minute) that your boiler can heat up and send to your radiators, taps and showers at any one time. The more taps and showers that could be in use simultaneously or the greater the number of radiators you have, the higher the flow rate you need.

However, you should establish what the mains pressure is at your property as a combi boiler can only heat the water that comes into your home.

For example, if your mains pressure is 12 litres per minute, your boiler can only heat and distribute hot water at a rate of 12 litres per minute even if it has a higher flow rate capacity. Typically, a power shower will require 10 litres of water per minute.

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 the Worcester Bosch Greenstar Heatslave II External 25/32?

The Worcester Bosch Greenstar Heatslave II External 25/32 measures 950 mm in height by 640 mm in width by 770 mm in depth.

There are several benefits to choosing an external, floor-standing combi boiler like the Worcester Bosch Greenstar Heatslave II External 25/32. External boilers free up space indoors and reduce internal noise pollution to almost zero. They are also easier for an engineer to access if a problem develops and an external boiler reduces the chances of carbon monoxide leaking into your property.

External boilers are fitted in weatherproof housing and are perfect for homes that require oil-fired heating because they are not connected to mains gas. Leakage is always a possibility with oil boilers but, as this Worcester Bosch Greenstar Heatslave II External 25/32 Combi boiler is fitted outside your home, there is likely to be much less damage to your property if it leaks and no odour of oil in your home.

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

The Worcester Bosch Greenstar Heatslave II External 25/32 is a condensing boiler – we recommend to all clients that they choose the very latest condensing boilers because their efficiency continues to improve year after year.

Condensing boilers recycle heat from both water vapour condensation and flue exhaust gases via a secondary heat exchanger. With this heat, it performs other tasks like warming up colder water returning from your radiator without having to use more oil.

You will save money on your oil bills every year by choosing a condensing boiler as well as benefitting the environment.

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

Environmentally-friendly heating has become an important issue for homeowners concerned about the accelerating pace of 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.

If you would like your next boiler to help in the fight against climate change, would the Worcester Bosch Greenstar Heatslave II External 25/32 combi be a suitable choice?

An energy efficiency rating of 92% or above is a legal requirement for all boilers manufactured and installed in the UK today. 92% is equivalent to a low-to-middle "A" grade on the "Seasonal Efficiency of Domestic Boilers" (SEDBUK) scale.

Energy efficiency measures how much energy a boiler uses and wastes in the course of its normal operation. The lower the waste, the lower your oil bills.

The Worcester Bosch Greenstar Heatslave II External 25/32 was awarded an efficiency rating of "90%", equivalent to a "A" rating on the SEDBUK system.

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 External 25/32 has a rating of "A" for heat and "B" for hot water production.

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

The parts and labour warranty on the Worcester Bosch Greenstar Heatslave II External 25/32 covers all repair-related costs for 2 years while the heat exchange warranty covers you for [Heat Exchange Warranty] 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%
Menu