If the Worcester Bosch 4000 were a car, it’d be a sleek German saloon. Efficient, refined, easy on the eye — and just the right amount of clever under the bonnet.
We’re talking about a combi boiler, yes. But not just any combi boiler. This is the new generation. The glow-up. The 4000 is Worcester Bosch’s answer to “how do we make one of the UK’s most-loved boilers even better?”
And spoiler alert: they’ve nailed it.
First Impressions: Sleek, Quiet, Classy
Gone are the clunky white boxes of yesteryear. The 4000’s had a facelift — and not one of those tight, weird ones. We’re talking smooth lines, a crisp LCD screen, and a minimalist front panel that wouldn’t look out of place on a Tesla.
It even comes in white or black. That’s right — a black boiler. Finally, something that says “I know what flow rates are, but I also have taste.”
Under the Bonnet: What’s It Packing?
Let’s get into the specs:
- Flow rate: 12.3 litres per minute (30kW model) — plenty for showers that actually stay hot
- Quiet Mark certified: runs quieter than a cat tiptoeing across a carpet
- Built-in RF boiler control: makes pairing it with wireless controls (like the Bosch Comfort+ II) a breeze
- Hydrogen blend ready (20%): it’s future-proof without shouting about it
- Sleek new screen with simple diagnostics: no more decoding flashing lights like you’re trying to defuse a bomb
In short, it’s smart, solid, and built to last.
What’s It Like to Live With?
If you’re upgrading from an older boiler, switching to the 4000 is like trading your 2005 hatchback for a brand-new Audi. You’ll notice the difference immediately.
- Hot water feels instant
- Heating comes on fast and feels balanced
- No clunking or humming noises
- More efficient — lower gas bills without having to wear three jumpers
And paired with smart controls, it becomes even more intuitive. Want to change the heating from your phone? Done. Want a holiday mode while you’re away? Sorted. Want to show off to your mates that you can turn the hot water on from the pub? Absolutely..
The DTS Verdict
We fit a lot of boilers at DTS — and this one’s an engineer favourite. Why?
- It’s reliable (Worcester Bosch are known for it)
- It’s easy to fit and service
- Customers love the look and performance
- It works well in most UK homes, especially 1–2 bathroom setups
If you’re looking for a premium combi boiler that doesn’t scream for attention but delivers when it counts — this is it.
The Only Downsides?
Let’s be honest — it’s not the cheapest option on the market. But like a well-made car, you’re paying for build quality, performance, and peace of mind. Plus:
If your home has very high hot water demand (e.g. two power showers running at once), you might want to look at the 8000 range insteadt because” — unless you’ve got the demand to justify it, you’ll be wasting gas and money.
You’ll need a decent wall space — it’s compact, but not magic
DTS Supply & Fit Packages Available
We supply and fit the Worcester Bosch 4000 all over South Yorkshire, and we do it properly — with:
- Proper flushing and setup
- Worcester’s 10-year guarantee (when fitted with filter and controls)
- Friendly, tidy installers who don’t leave your house looking like a crime scene
Want a quote?
Book a survey with us here:
www.dtsplumbing.co.uk/book-an-appointment
Fancy One With a Service Plan?
Get the 4000 installed and protect it with our Cosy Care Plan — includes:
- Annual servicing
- Priority callouts
- Parts and labour cover
- And 10% off if you sign up before installation
Find out more:
www.dtsplumbing.co.uk/boiler-cover-plans
Final Thoughts
The Worcester Bosch 4000 is one of those rare bits of kit that just gets everything right. Looks good, runs quietly, performs brilliantly, and won’t leave you stranded in the middle of winter.
It’s not just a boiler — it’s a lifestyle upgrade.
(OK, maybe not quite, but it’s close.)