Worcester Bosch Greenstar 4000 boiler review

worcester bosch greenstar 4000 review

Worcester Bosch Greenstar 4000 boiler Review – Is it any good? Yes, it’s one of the best, here’s why

The Worcester 4000 is the latest updated version of the most installed boiler in the UK, the Greenstar 30i, and it really is one of the best boilers on the market right now.

Worcester Bosch is one of, if not the biggest boiler manufacturer in the UK, and after decades of dominating the market, they have decided it’s time for an upgrade.

Let’s take a look at the brand new hydrogen-ready Worcester Bosch Greenstar 4000 review and some of the main things people want to know when buying a new boiler.

Worcester Bosch 4000 Review which best buy

Worcester Bosch Greenstar 4000 boiler Reviews – main information

  • Boiler Price – From £1,795 with installation
  • Available in both combi boiler & system boiler
  • Combi gas boiler outputs – 25kW & 30kW
  • System gas boiler outputs – 12kW-24kW
  • Dimensions – 710 x 400 x 310mm
  • Gas Condensing Boilers
  • Energy efficiency rating – A
  • Flow Rate –  From 10.2 l/min (combi Boiler)
  • Up to 10 years warranty
  • Hydrogen boilers (H2)

Worcester Bosch 4000 boiler – What it’s all about

We’ve quickly given you the overview of the boiler here as it may save you time and money.

If you want to find out a bit more about the brand new Worcester 4000 then we have taken the time to dissect this brand new boiler and see what’s good about it, and what’s not so good.

We’ll give you a quick heads up, there’s not much wrong with it and since it has been released it has easily become the best-selling combi boiler on the market. This mid-range combi boiler has taken off right away and rightly so. Here’s all the technical boring stuff you may be interested in.

Worcester Bosch Greenstar 4000 specification

Worcester Bosch Greenstar 4000 SpecificationGreenstar 4000 25kWGreenstar 4000 30kW
ErP Efficiency RatingAA
LPG model availableYesYes
Control Options *YesYes
EasyControl Compatible 1YesYes
Solar CompatibleYesYes
Central heating output (kW)2424
Dimensions (mm) height x width x depth724 x 400 x 310724 x 400 x 310
Hot water flow rate 40°c9l/min12.3l/min

Worcester Bosch 4000 combi boiler review

Worcester Bosch 4000 Review old greenstar i range

Firstly we have reviewed the Greenstar 4000 combi boiler rather than the system boiler because they are the most common boiler in the UK.

This boiler is replacing the legendary Greenstar i series which has been in production for over 10 years from Worcester.

The old Greenstar i is renowned for reliability and longevity. So its replacement needs to be better, and well, it is.

Available in the same outputs as the old boiler, the new one comes in the 25kw which is better for smaller homes, and the highly recommended and sought after 30kw version which is one of the most installed outputs in the UK.

30kw is widely regarded as the best output due to its versatility of it. IUt is still energy efficient whilst having that backup power when needed. nice to know if you want to fire up the central heating quickly if you forgot to turn it on on your way home with your new trust smart thermostat!

Worcester 4000 30kw combi

Apparently, they’ve taken the old Greenstar ‘DNA’ as Worcester says from the Greenstar 25i and Greenstar 30i boiler, fiddled with it to make it better, and given it a whole new look.

This new Worcester Bosch model is barely recognisable from the outside, but we are told the insides have been tweaked to be more economical & future-proof.

The Worcester 4000 30kW is already a huge hit.

How much does a Worcester 4000 cost?

How much does a Worcester Bosch Greenstar boiler cost is the big question? It’s new so it’s going to cost more. Wrong, it doesn’t cost any more than the old Greenstar I.

Fantastic news! It’s not the cheapest replacement boiler on the market, but it’s priced as it should be for a mid-range boiler.

The new Worcester 4000 costs around £950 to buy from a local merchant. Remember though this doesn’t include the full installation from a Gas Safe registered heating engineer.

If you want a fixed price quote tailored to your home’s needs on this boiler, you can simply click get a quote now with one of our recommended installation companies who can fit this boiler on your wall in under 24 hours!

The Greenstar 4000 is fully available with boilers on finance too to spread the cost.

Worcester Bosch 4000 Boiler Prices Table

Here you can see our Worcester 4000 combi boiler price guide. Boiler prices vary from seller to seller and if you require installation, expect costs to be much higher.

Worcester Bosch Greenstar 4000 25 kW Combi Boiler£950
Worcester Bosch Greenstar 4000 30 kW Combi Boiler£1,050

Worcester Bosch 4000 main features

With a new boiler comes the expectation of new features, so latest take a look at some of the internal and external features that make the Greenstar 4000 a ‘better than ever’ boiler.

Worcester Bosch 4000 LCD touchscreen colour display

Worcester Bosch 4000 Review lcd touchscreen

There’s no second-guessing what’s going on with your new Worcester 4000 when in operation.

The new touchscreen display is clear and simple and if in the unlikely event of anything going wrong, you will be able to diagnose the problem right away. No Gas Safe qualification is required!

It clearly shows in full text what is going on.

A colour pressure gauge, boiler temperature, and easy-to-use and navigate menus make this a technophobes dream. 

Worcester 4000 Quick tap water saving feature

Energy-saving and water-saving are ever more key in saving our planet and our hard-earned cash.

The Worcester ‘quick tap’ is just another addition to help save water which also in turn saves on gas. Excellent considering the recent ridiculous price hike everyone is suffering at the moment.

Simply turn your tap on and off to kick start your boiler, 30 seconds later turn it back on, and boom!

Hot water without running the tap to get there. Great eh! This may just seem like a bit of standing around, but when you have thousands of people across the country doing the same thing, it all starts to add up.

Worcester Bosch 4000 Review quiet mark

Worcester 4000 Quiet Mark Accreditation

The Greenstar 4000 is a whole 10% quieter than the old Greenstar i range. it is one of the quietest boilers on the market and therefore has been recognised by the Noise Abatement Society.

This may not seem a lot, but when you consider that the old boiler was already quiet, it’s pretty impressive, therefore given the Quiet Mark accreditation.

This boiler can fit in kitchen cupboards too, so this will also make it go more unnoticed! 

Worcester 4000 SimpleSwitch & Wall Mounting Frame

Good news if you have the old Greenstar i, Worcester have thought about you!

They have maintained the parts in the same position to enable an easy swap for any new Worcester 4000 just to slot in place. What a great idea to ensure you get another Worcester!

They can fit in cupboards, but you may need a special boiler kitchen cupboard to make sure.

Worcester 4000 Easy access to all key components

Worcester Bosch 4000 Review easy access side panel remove

Let’s face it, life’s not easy and things go wrong, but when they do we want an easy fix. The less hassle the better, and in times where time is of the essence, Worcester Bosch has thought of you.

The 4000 is prepared and ready for any problems that may arise and has front access to all key components such as the PRV, heat exchanger, and more.

Great if your plumber is on an hourly rate or you want to move your boiler to a tight spot! The Worcester Bosch 4000 is ideal for anyone who wants that perfect mid-range combi boiler that will keep them warm all year round with the minimum fuss.

Worcester 4000 Boiler Intelligent Auto Filling

If you are ever bothered to look at your water pressure gauge sometimes it will drop and you may have to fiddle with a few taps underneath and watch the gauge rise.

Not with the Greenstar 4000, it does it all itself. No worrying if you’re going to flood the house or turn the water off! This intelligent auto-filling system takes away from all your low boiler pressure woes and having to second guess whether or not you have the right amount or not.

Worcester Bosch 4000 System boiler

The Worcester bosch system boiler range has all the same benefits and parts upgrades as the combi boiler. It can slot right into an old Greenstar i system boilers place and take off right where it ended.

All Worcester Greenstar system boilers need a hot water storage cylinder to work, so ensure that you definitely need a 4000 system boiler and not a combi.

If you have a back boiler, the 4000 is a great back boiler replacement. If you’re looking for a hot water cylinder as part of your quote, expect costs to be much higher when replacing your boiler.

Worcester Bosch does make hot water cylinders, but you don’t have to use theirs. Their system boilers can work with any hot water tank.

Worcester Bosch Greenstar 4000 system boiler specification

Worcester Bosch Greenstar 4000 System SpecificationGreenstar 4000 System 12kWGreenstar 4000 System 15kWGreenstar 4000 System 18kWGreenstar 4000 System 21kWGreenstar 4000 System 24kW
ErP Efficiency RatingAAAAA
ErP Data SheetErP Data SheetErP Data SheetErP Data SheetErP Data Sheet
LPG model availableYesYesYesYesYes
Control OptionsYesYesYesYesYes
EasyControl Compatible 1YesYesYesYesYes
Solar CompatibleYesYesYesYesYes
Central heating output (kW)1215182124
Dimensions (mm) height x width x depth724 x 400 x 310724 x 400 x 310724 x 400 x 310724 x 400 x 3107244 x 400 x 310

Worcester 4000 System Boiler Price Table

If you’re choosing a new Worcester bosch 4000 system boiler then you have a few more to choose from than the combi range. Rember to take into account that these boiler costs do not include installation or a hot water cylinder.

However, if you already have a hot water tank, then these new system boilers will be perfect to use with any that you already have in your home.

Worcester Bosch Greenstar 4000 12 kW System Boiler£945
Worcester Bosch Greenstar 4000 15 kW System Boiler£990
Worcester Bosch Greenstar 4000 18 kW System Boiler£1,025
Worcester Bosch Greenstar 4000 21 kW System Boiler£1,070
Worcester Bosch Greenstar 4000 24 kW System Boiler£1,115

Worcester Bosch Greenstar 4000 boilers online reviews

We’ve mentioned some of the fun stuff, and the boring stuff, but here is our verdict on whether or not you should spend your hard-earned cash on this particular new boiler.

Worcester Bosch 4000 Review trustpilot

As you can imagine from the rest of the reviews they are rated Excellent on TrustPilot from thousands of reviews also bolsters the claims of the Worcester Bosch brand.

Worcester Bosch has dominated the market with their Greenstar boiler range and with years of backing from energy giants British Gas, their boilers are installed in more homes than not!

If they ever wanted to secure their place in the boiler market moving forward, they had to evolve, and with the Worcester Bosch 4000, they have done just that.

It has been an exciting wait for a new Worcester and this mid-range family boiler perfect for most homes in the UK has picked up where the old one left off and is flying off the local plumbing merchants’ shelves into homes in the UK every day.

Worcester 4000 Performance – 9/10

It’s a Worcester Bosch, it was always going to perform well in the heating department. There was no way they were going to take a backward step after years of domination. 9/10 suggests that this boiler is always going to do just as it says and it will deliver in most small to medium-sized homes day in and day out.

The Worcester Bosch 4000 combi boilers’ performance is only backed up by its reliability and brand new features such as the built-in Wifi and hydrogen-ready technology meaning you get more bang for your buck.

If you get the Worcester 4000 system boiler if you have more than 1 bathroom then expect rapid filling of baths and also great water pressure to multiple outlets at the same time.

Worcester 4000 Reliability – 9/10

It’s a Worcester…. Can we use that again?

In all seriousness though, Worcesters we see or hear of very few complaints from Worcester Bosch owners and if looked after with its obligatory yearly Worcester boiler service then you should have years of hassle-free heating.

There are currently supply issues (December 2021) due to electrical component shortages, so this could be a sticking point if this breaks in a 4000 boiler as you may be waiting a while for the part.

Whilst missing parts arent as such a reliability issue, it would be nice to know that if anything did go wrong your boiler would be getting fixed. Luckily, Worcester customer service is up there with the best.

Worcester Bosch 4000 Boilers Prices – 8/10

Worcester Bosch 4000 Review 10 year guarantee

With new boiler costs ranging from £1,900 to £2,200 including installation with our recommended installers such as Boiler Central, it’s not the cheapest boiler you can buy, but it’s priced accordingly for the market it is aimed at. The 4000 will be Worcester‘s mid-range boiler.

That said, you can get a Viessmann Vitodens 050-w for less for the same performance, reliability, and warranty!

The Worcester 2000 is also cheaper but lacks a long warranty although it is slightly more compact if you are looking for something a little bit smaller.

Worcester Greenstar 4000 Warranty – 8/10

If this boiler is that good it should get the market-leading 12 years warranty that are on offer for some boilers these days.

You can only get the full 10 years too if you upgrade and pay a little bit more for your boiler. It’s a bit sneaky, although we think it’s worth it if you are going to buy this boiler. 

Worcester 4000 Reviews Overall Score 8.5/10

8.5 is a pretty good score, if it was slightly cheaper it would be a 9, but then we are quibbling over around £50-£100 depending on where you buy. But, the money is always better in your pocket than theirs! Try Boiler Central for a free online fixed price quote.

Worcester 4000 Problems – Common issues if your boiler is not working

The Worcester 4000 is a brand new boiler so other than supply issues due to parts not being available, we haven’t encountered too many issues or boiler breakdowns as of yet.

The most common problems with the Worcester 4000 will be problems that you have with every other boiler such as low water pressure which can happen over time or your condensate pipe being blocked which is usually due to freezing.

If you have a Worcester Bosch blue light flashing, this may be the cause among other issues.

These are easily fixed by topping up the water pressure and defrosting your condensate pipe. If this is not the problem and you need a new boiler, get your boiler quotes now.

Worcester 4000 Supply issues due to electrical component shortages

If you have been told that there may be a supply issue or the Worcester 4000 is not in stock then this is true due to the fact that there is a shortage of electrical components that are required for the Greenstar 4000 boiler.

If you do order a Worcester Greenstar 4000 boiler online, it is always best to check or expect possible delays in installation. If you can’t wait, we suggest installing the Viessmann 050-w which is as good, if not better than the 4000.

Worcester Bosch 4000 Boiler Thermostats & Controls

Worcester Bosch 4000 Review bosch easy control smart thermostat

Everyone these days wants a smart thermostat.

Who doesn’t want to get their home nice and warm on a cold winter’s night for when they get in after a day’s hard graft.

Well with the Worcester 4000 you have a multitude of options, both smart and regular for those who prefer a simple life. 

Worcester 4000 Bosch EasyControl

Why let Hive and Nest have all the fun when you can design your own smart thermostat and app.

This is exactly what Worcester has done with the Bosch EasyControl.

Simply connect to your Greenstar 4000 through the built-in WiFi, download the app to your phone or device and you can control your heating from anywhere that you have an internet connection! 

Comfort Plus II

Worcester Bosch 4000 Review nest

This is Worcester’s best standard thermostat.

Simple to use like any normal thermostat with settings and programs for you to be able to change the temperature at certain times. Easy to use and great if you are in and out of your house at regular times.

Hive & Nest

Both these smart thermostats are universal and can be used by most boilers on the market if installed correctly.

They work just the same as the EasyControl but are a lot more versatile. They’re not cheap, but apparently, they’re supposed to save you money on your gas and electricity bills.

Partly true but it isn’t that simple.

These connect to the boiler using the built-in WiFi also. 

Worcester Bosch 4000 Boilers Reviews Summary

We love the Worcester Bosch 4000, it no doubt will be a big hit and installed in thousands of homes across the UK. It is easily one of the best combi boilers on the market and it has quickly taken over from the Worcester 2000 combi boiler as the best seller. You Worcester 4000 boiler quotes online now in under 20 seconds for free.

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