Worcester Bosch 4000 30kw Combi Boiler Review

If you’re on the lookout for a new boiler, Worcester is likely on the top of your short list. In this review we’ll explain everything you need to know about the Worcester Bosch Greenstar 4000 30kw combi boiler before you make a purchase, including: 

• The Worcester 4000 30kw in summary
• What properties this combi boiler is suited to
• The expected price for your new Worcester boiler installation
• Top features of the Worcester Bosch Greenstar 30kw combi

In Summary: Worcester Bosch 4000 30kw Combi Boiler

The Worcester Bosch 4000 30kw is one of the most popular boilers in the UK right now, suitable for 2-3 bedroomed properties with 1-2 showers. 

Whilst the majority of boiler fitters will price installations in the region of £3,000-£3,250, our prices start at £2,580 inclusive of a 10-year warranty. You can get an exact price within a couple of minutes using our clickable boiler installation quote form here. 

As you’ll see in this review, the 4000 30kw combi includes a huge host of features including:

• 10-year warranty (alongside a 12-month workmanship warranty from Dwellow)
• Bosch Easycontrol
• Quick Tap
• Quiet Mark Approved
• Smart Fill
• Anti Frost Condensate
• Power Modulation
• Low Flow Rate Operation

If you’re looking for a reasonably priced combi boiler, have a 2-3 bedroomed property with average hot water and heating demand and are focusing on energy efficiency, the Worcester 4000 is for you. 

Which Properties is The 4000 30kw Combi Suitable For?

The Worcester Bosch 4000 30kw combi boiler is suited to 2-3 bedroom properties with average heating and hot water demand. 

Essentially, this would mean 1 bathroom, or a maximum of 2 in some cases. A 30kw combi boiler like the Worcester 4000 simply wouldn’t be able to keep up with demand if more than 2 showers or bath taps were running at the same time. 

To double check this combi boiler is suited to your property, you can use our new boiler calculator here. If the Worcester 4000 combi isn’t suitable for your property, our boiler tool will suggest the best alternatives. 

Worcester 4000 30kw Boiler Installation Costs

So, how much does the Worcester 4000 30kw cost? 

If you’re looking for the boiler only, expect to pay around £1,300-£1,400 from a plumbing and heating merchant. Of course, this doesn’t include a lot of materials needed to install the boiler including: 

• Flue
• Heating controls
• Copper pipe and fittings
• Solder
• Thermostatic radiator valves

Prices for a Worcester 4000 30kw including installation can be as high as £3,250 from many installers in the UK, which would include everything mentioned above (flue, controls etc). No heating installation is the same, so prices vary from job to job. 

If you want to get a price for a Worcester 4000 30kw combi boiler installation on-screen, you can use our new boiler installation quote form here. Our prices for installation of the Worcester 4000 30kw combi start from as little as £2,580.

Top Features

It goes without saying that Worcester Bosch is a market leader when it comes to boilers. The Greenstar 4000 range is the updated version of the old Greenstar i, and comes with a raft of new features which we’ve mentioned below.

10-Year Warranty

Besides choosing a boiler to match your hot water and heating demand, warranty is the next most important thing to consider. Investing £2,500+ in a new installation using a boiler that only has a 2-5 year warranty, isn’t going to be cost effective long term. 

Our prices for the Worcester 4000 30kw combi boiler include an extensive 10-year warranty. And, our workmanship is also covered by a 12-month warranty too!

Bosch EasyControl (sold separately)

From a homeowner perspective, the 4000 30kw from Worcester is one of the easiest boilers to operate on the market. Using Bosch’s EasyControl you’ll be able to:

• Monitor your energy usage on the move
• Control your heating remotely using the likes of Alexa or Google Home Assistant

All-in-all this means you’ll have a property that’s more comfortable, not to mention much more energy efficient than it would have been using your old boiler.

Quick Tap 

Combi boilers don’t store hot water, they heat water on demand. What this means is you could be waiting 10 seconds or so before you have even luke-warm water when using an old boiler. This adds up to huge amounts of energy wastage as well as extra money owed to your utility provider.

The Quick Tap feature used on the Worcester 4000 30kw combi boiler means you’ll get almost instantaneous hot water; reducing the amount of energy wasted and your overall monthly energy consumption!

Quiet Mark

Like most Worcester Bosch Greenstar boilers, the 4000 is Quiet Mark approved. It operates as low as 42dB, which is approximately 10% quieter than the old Greenstar i. 

This is particularly important if your boiler is located in an airing cupboard or kitchen that is next to / underneath a bedroom in your property.

Smart Fill

One of the biggest causes of a lockout and an emergency boiler repair is a drop in pressure. Worcester Bosch has incorporated the Greenstar Intelligent Filling System into the 4000 30kw combi to combat this exact problem. What this means is it will adjust the pressure so you don’t have to. 

Of course, most drops in pressure signify there’s a leak in the heating system somewhere. If the boiler notices a significant leak, it will lockout.

Anti Frost Condensate

Another common reason homeowners call out heating engineers for a quick-fix, is a frozen condensate pipe. 

Put simply, the condensate pipe dispurses waste gases and fluids from the property. As temperatures drop below freezing, they can freeze up which the boiler will see as a blockage. Any blockage in the condensate pipe will cause the boiler to lockout, as it’s no longer safe to continue operating.

The large condensate syphon (500ml) used in the Worcester 4000 pre-heats any condensate discharge meaning the chances of a lockout of this kind is reduced. 

Power Modulation (Central Heating)

Although you’ll have a new boiler fitted that’s most suitable for your property, there isn’t an exact boiler to suit every single property’s specific requirements. Potentially, this means your boiler is using more energy than it needs to. 

Worcester’s solution with the 4000 30kw combi boiler is a power modulation function. This means your boiler can be modulated down to just 3kw of central heating output. Overall, this is going to equate to using less energy usage and huge cash savings when it comes to your energy bills!

Low Flow Rate Operation

If you live in a flat that’s not on the ground floor, or in an area renowned for low water pressure, many boilers simply won’t function correctly.

And, this is another reason to pick the Worcester 4000 30kw combi. It can be fully functional even when mains water pressure is as low as 1 bar. 

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