Worcester 4000 vs Ideal Logic Combi Boiler Review

James Elston
Written by James Elston
Updated on 19th September 2023
Posted on 18th September 2023
Worcester 4000 vs Ideal Logic Combi Boiler Review

Worcester 4000 vs Ideal Logic boilers: Which is the best?

When selecting between a Worcester Bosch or Ideal boiler, it can be difficult to know which one best suits you, particularly if both brands offer efficiency, reliability and durability.

At Boiler Central, we aim to only have the best modern boilers up for quotes, including Worcester Bosch and Ideal. These 2 boilers are 2 of the best-selling boilers on the market and they both have their differences, good and bad but essentially it will be which is best suited to you and your home.

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So, Which is the best boiler out of the 4000 & Logic?

This guide will look at what makes the Worcester 4000 a great boiler and how it compares to the Ideal Logic. At the end of this Worcester 4000 vs Ideal Logic article, you should better understand which new boiler is best for your home.

During our Worcester 4000 vs Ideal Logic battle, we will compare the following factors: technology, price, efficiency and available models. Let’s begin!

Who are Worcester Bosch?

Worcester Bosch is a household brand with boilers keeping UK households warm since 1962. The brand is committed to providing the highest of standards.

You can get a vast array of oil and gas boilers and hot water cylinders from Worcester to ensure that their products can seamlessly integrate into your home.

Who are Ideal Heating?

Ideal Heating has offered central heating solutions for homes for more than 100 years. The brand is committed to maintaining its core principles of value, innovation and quality while doing its part for a sustainable future.

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Why choose the Worcester 4000 over the Ideal Logic?


The Worcester Bosch 4000 is quite efficient, with an ErP A rating. It also ranks between 91 to 94% efficient, meaning that it can seamlessly extract more than 90% of the heat that would otherwise be wasted. This heat is then recycled back into the central heating system.


Worcester 4000

The Worcester 4000, like other Worcester Bosch boilers, utilises aluminium heat exchangers. Aluminium heat exchangers are extremely efficient and effective; however, they do not provide the same rust protection as heat exchangers made from stainless steel do.

This means you will not likely have to replace the heat exchanger in your Worcester 4000 sooner than you would another boiler with a stainless steel one. Nevertheless, if you service your Worcester 400 every year, you don’t have to worry about a replacement for a minimum of 10 years.

In terms of quietness, Worcester Bosch has been working effectively over the years to ensure that every boiler it creates can operate as quietly as possible, with a number of its boilers getting the Quiet Mark certification, including the Worcester 4000.

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How good is the Worcester 4000?

The new Worcester 4000 was introduced in 2001 and is available as both a system and combi boiler. You get new technology, a compact boiler size, and a sleek design. Note that the Worcester 4000 replaces the old Worcester Bosch Greenstar i.

Here are a few important features of the Worcester 4000:

  • Hydrogen ready boiler
  • Midrange boiler
  • Compatible with Worcester Bosch products and controls such as Hive and Nest
  • Offers a quieter operation over the Worcester Greenstar i it replaces.
  • 10-year guarantee
  • Removable side panels offer easy access to servicing
  • A great choice for small to medium-sized houses

The Worcester 4000 makes the best combi boiler for smaller homes with just a single bathroom. With this boiler, the household can have an instant hot water supply. The Worcester 4000 is available in two different power outputs, ensuring that this model is suited to more UK homes.

Video: Worcester 4000 Boiler Review

Available in just 2 outputs of 25kw and 30kw, the Worcester 4000 combi boiler is perfect for small to medium-sized homes, but find out more here:

Worcester 4000 25kW combi boiler

This boiler is great for smaller homes with a maximum of 10 radiators. The Worcester 4000 25kW combi boiler offers a flow rate measured at 10.5L/min and a heat output of 25kW.

This boiler is not suited to homes with two or more bathrooms as it will be underpowered. This combi boiler from Worcester can help you save money on your energy bills in the right home.

Worcester 4000 30kW combi boiler

This model of the Worcester 4000 is best suited to small and medium-sized homes with a maximum of 16 radiators. This additional 5kW of energy helps increase the flow rate by 1.8 to 12.3L/min. This combi boiler can also handle two bathrooms, making it great for homes with a higher demand for hot water.

How much does the Worcester 4000 cost?

You should note that Worcester is one of the more premium brands of boilers on the market, so premium prices come with their boilers. Nevertheless, these prices simply underline the reliability and high quality every Worcester 4000 user is bound to receive.

As stated earlier, the Worcester 4000 is a medium-range boiler, so there are Worcester Bosch boilers that cost even more. You can purchase the Worcester Boiler 25kW for about £2,100. You should note that this boiler price also includes the installation fee.

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Why Choose The Ideal Logic Over The Worcester 4000?


Ideal is known for creating extremely efficient gas condensing boilers. The whole Logic line has an ErP rating of A, with each boiler providing 91 to 94% efficiency. The Ideal Logic can extract greater than 90% of the heat that would have been wasted. This heat is then recycled back into the central heating system.



Unlike Worcester, Ideal lets users select boilers with an aluminium heat exchanger or a stainless steel one, making it the more versatile brand. This might not seem like much, but as we have touched on earlier in this Worcester 4000 vs Ideal Logic article, stainless steel heat exchangers are more desired thanks to their high corrosion resistant properties.

However, a drawback is that while stainless steel heat exchangers are more durable, aluminium heat exchanges have a higher thermal conductivity property, making them smaller. This, in turn, means that boilers with aluminium heat exchangers are a lot smaller.

The Ideal Logic is also extremely quiet, having received the Quiet Mark. This certification means that it has been tested to operate as quietly as possible. This can benefit customers who worry about placing their boilers upstairs next to their bedrooms.

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How good is the Ideal logic?

If your home has just one bathroom, then a combi boiler is a great choice for you. with a design that doesn’t need hot water cylinders and water tanks, combi boilers make a great choice for smaller homes.

However, one thing to note about combi boilers is that if you need hot water from various outlets concurrently, the boiler might not be able to handle the increase in demand.

The Ideal Logic Combi is available in 2 versions: 24 and 30.

Watch our Ideal Logic video now, is it better than the Worcester 4000?

Ideal Logic Combi 30

The Ideal Logic Combi 30 is a natural gas combi boiler that has been designed with efficiency in mind.

Because it can achieve a stellar 93%, this boiler is one of the most efficient boilers available on the market and is the gas boiler replacement choice for new builds.

The hot water output offers a maximum of 30kW, making it a great choice for homes with up to 10 radiators. This combi boiler stands out because of its frost protection. If you are away, the combi boiler automatically adjusts its settings to ensure any water in its system doesn’t freeze. You can also use this Ideal Logic Combi with the Weather Compensation Kit from Ideal.

This system records the temperature of outside air, so when there is a temperature change, the boiler flow temperature also changes to those conditions, so you don’t have to worry about running costs.

Ideal Logic Combi 24

The Ideal Logic Combi 24 is one of the best combi boilers out there and has the same features as the Combi 30 listed below. The major difference is that the Ideal Logic Combi 24 has a maximum output of just 24kW instead of 30kW. This makes it one of the smallest boilers in this Worcester 4000 vs Ideal Logic article.

How much does the Ideal Logic cost?

Just like Worcester, Ideal has a vast array of boilers, all within different price tiers. These are designed so that there is a boiler for every price range. The Ideal Logic 30kW, for instance, can be purchased for just under £2,000 (£1,995 with installation included), making it a significantly less expensive alternative to the Worcester 4000.

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Worcester 4000 vs Ideal Logic: How to Know Which Boiler Size You Need

You have to consider the number of radiators you have in your home, coupled with the type of boiler you want.

Number of radiatorsType of boilerRequired output
From 15 to 20Heat or system only boiler35-40
From 15 to 20Heat or system only boiler30
From 10 to 15Combi boiler28-32
Maximum of 15Heat or system only boiler24
Maximum of 10Combi boiler24
From 10 to 15Heat or system only boiler18
Maximum of 10Heat or system only boiler12-15

Ideal Logic Vs Worcester 4000 Conclusion

With the table above, you should have no problem identifying the right boiler output you need for your home.

Considering the features and available outputs highlighted from both boilers in this Worcester 4000 vs Ideal Logic battle, choosing one depends on what you want from your boiler and your budget.

If you want to compare the Worcester to another boiler, check out our Worcester 4000 vs Viessmann Vitodens 050-w review which. is a battle between the best 2 selling boilers right now.

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Written by
James Elston
James Elston Director Of Boiler Central
Posted on: 18th September 2023

James Elston is our resident boiler replacement and heating expert here at Boiler Central. With over 20 years experience in the boiler installation industry, James ensures that he knows everything there is about our Gas Safe boiler installations, energy saving and home heating solutions. This can be from simply procuring the latest best combi boilers, to reviewing and ensuring that Boiler Central maintains the highest standards across our boiler installation company.

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