Worcester Bosch 25i Combi Boiler Review

The Worcester Bosch Greenstar 25i ErP combi boiler is the smallest of the Greenstar i combi boiler range, but it still packs a formidable punch. You can be safe in the knowledge that this efficient and reliable boiler will provide all your central heating and hot water requirements for homes with up to three bedrooms and one bathroom.


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Which? Magazine were so impressed with the Worcester Bosch Greenstar 25i ErP combi boiler, that they awarded it with their prestigious Best Buy status. This comes from combined reviews from both customers and professional engineers and is a real mark of quality. Worcester Bosch was also named the best boiler brand by the consumer champion for the tenth year in a row in its annual boiler report.

At Clever Energy Boilers, we recommend installing Worcester Bosch boilers in your home. Our experienced fitters work with all manner of units from a range of manufacturers and all agree that models like the Worcester Bosch Greenstar 25i ErP combi boiler are best suited to the majority of homes in the UK. Once you pick the ideal Worcester Bosch Boiler for your needs, we will come a fit it in an efficient and professional manner, making sure we leave your home neat and tidy.

Worcester Bosch Greenstar 25i ErP Combi Boiler Features

Here are some of the main Worcester Bosch Greenstar 25i ErP combi boiler features to help heat your home in an efficient manner.

  • Simple boiler controls and compatibility with a range of external controls.
  • Clear displays to aid precision and economy.
  • Low energy pump cuts electrical demand.
  • A+ ErP rating when installed with Bosch EasyControl

Simplicity is the key with the Worcester Bosch Greenstar 25i ErP combi boiler. You don’t want to have to reach for the instruction manual every time you need to make a small adjustment, so the easy to use controls of this model are more than welcome. The display tells you everything you need to know in as simple a way as possible, so you can quickly and easily make the changes you want.

You can also use a host of different external controls to give you the precision that allows you to tailor the temperature to your exact needs, rather than the general temperature region you require. This means that you don’t waste energy making your rooms any warmer than they need to be.

When you install the smart internet connected EasyControl system, the Worcester Bosch Greenstar 25i ErP combi boiler achieves an A+ ErP rating. It also means that you can put the heating on, turn it off and set the temperature you need from anywhere with an internet connection.

Worcester Bosch Greenstar 25i ErP Combi Boiler Size

The Worcester Bosch Greenstar 25i ErP combi boiler is perfect for homes with up to three bedrooms and one bathroom. If you have a flat, then this is an ideal option. You don’t need to find room for a hot water tank or cylinder as with a regular or system boiler. Instead the Worcester Bosch Greenstar 25i ErP combi boiler consists of a simple unit installed on the wall, usually in the kitchen or bathroom.

It is low-powered compared with many other Worcester Bosch combi boilers, but when it comes to efficiency, you don’t want an over-powered unit as you will end up paying for excess energy that you don’t use. We come to your home and perform a free, no obligation survey to assess your exact needs and can then recommend a boiler that is big enough to meet your needs, but not one that provides too much power.

If you want a more powerful unit than the Worcester Bosch Greenstar 25i ErP combi boiler, there is also a 30i version suitable for larger properties. Clever Energy Boilers can help you make this assessment and select the perfect boiler for you.

Cost of a Worcester Bosch Greenstar 25i ErP Combi Boiler

The cost of a Worcester Bosch Greenstar 25i ErP combi boiler depends on a few factors. If you are swapping an old combi boiler for this new model, the price will be lower than if your previous unit is a system or regular boiler. Similarly, if you want to install the new boiler in the same position as the old one, that will work out less expensive than if you want to move where your boiler is located. Rerouting pipework and installing new flues all add to the cost.

To get an accurate idea of the cost of a Worcester Bosch Greenstar 25i ErP combi boiler being installed in your home, the trusted member of staff who comes to perform the home survey will take all of these issues into account. They are experienced in the installation of boilers and can easily calculate how long the various tasks will take. They will provide you with a fixed, no obligation quote that includes all costs, so you can take your time to decide on whether to go ahead.

Not only will they quote for the installation of the Worcester Bosch Greenstar 25i ErP combi boiler, but they will also provide prices for a standard model boiler too.

Worcester Bosch Greenstar 27i System Boiler

new boilers by worcester boschIf a Worcester Bosch Greenstar 25i ErP combi boiler is not for you, you could look at the Worcester Bosch Greenstar 27i system boiler instead. This will power the central heating of a similar sized property, but can better handle multiple bathroom use too. However, you will need to find space for a hot water cylinder. System boilers pre-heat the water and store it in the cylinder, ready to be used by however many people need it. Of course, the downside is that you are limited to the amount of hot water in the cylinder and must wait for it to refill once that is empty.

The Worcester Bosch Greenstar 27i system boiler comes from the same line as its combi boiler equivalent and so you can be sure that it is a quality unit that will keep your home warm and cosy for as long as possible.


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Clever Energy Boilers is an accredited Worcester Bosch boiler installer, offering you peace of mind that we are trusted to fit these innovative and effective devices in a professional and safe manner. Worcester Bosch is our preferred boiler manufacturer, thanks to the quality of the items that the company produces. They are highly efficient, built to last and are easy to maintain.

It is not just us who recommends Worcester Bosch though, they are repeatedly named as the top manufacturer in the annual Which? Magazine boiler report, based on the responses of customers and industry professionals alike.

If you want to book  in a home survey, call 01274 214557 or fill in the Contact form on this page.

worcester bosch logo
worcester 25i combi boiler
  • A-rated for efficiency for central heating and hot water.
  • Looks stylish and modern in your home.
  • User-friendly controls.
  • Connectivity is a smooth and simple.
  • Powerful models up to 50kW.
  • Runs quietly in your home.
  • Trusted, industry-leading manufacturer.
  • Highest hot water flow rates of any boiler on the market.

When buying a new boiler, you want to speak to someone you can trust, that will support your needs now and in the future.

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My wife and I would like to thank you all for the competence and excellent work carried out at our home, from the estimate and the fitter who plumbed in the new boiler, to the electrician who made our programmer work with the boiler, an excellent team of manpower seldom seen with so called professionals.

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Mr & Mrs Sheen, Doncaster

Thanks Tom for all your patience and time you spent answering all my questions and promptly ringing me back each time and thanks to your office staff always polite and helpful, a big thank you to John and Chris for installing the boiler and all the other jobs, both worked efficiently and cleanly, John was very good explaining everything as he went along. 

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I am very happy with the service I received. My new boiler has been installed very quickly and hassle free, I would definitely recommend this service.

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Rizwan was a very good engineer he was very clean and made the place spotless after he had gone.

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Brilliant service from all the team. Thanks. Our old boiler died and from a very reasonable quote to fitting a new one within a couple days. Excellent advice and workmanship too.

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My old boiler went kaput, Clever Energy Boilers gave me a great price and fitted my new boiler within 3 days. Very pleased with the work carried out and would not hesitate to recommend to anyone needing a new boiler. A big thank you to both the installation team and the electrical man, both first class.

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