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Lock-In: Worcester 4000

Lock-In: Series 4 Webinar Library

Series 4, Episode 4.5

Hosted: 16/06/2021 06:00:00 pm

After a bit of an absence of Worcester Bosch on the Lock-In series, Alex Thomas returned to the Lock-In series to provide us with an overview of the brand-new Worcester Greenstar 4000 boiler that’s recently been added to the contract supported LNPG range.

You can watch this part of the webinar above, or you can read some of the key talking points below.


The Difference

The Greenstar i has long been one of the bestselling boilers in the UK – and, more importantly, amongst LNPG members – striking an almost perfect balance between functionality and price. The 4000 is a direct replacement of this boiler, so it may leave you thinking – if it ain’t broke, why fix it?

Consistent with the Worcester Bosch brand, it’s all about innovation. The 4000 has been created from the DNA of the Greenstar i, keeping the elements that you love – but also taking technological features and design inspiration from the 8000 and lifestyle range.

To be more specific, here are the key similarities and differences between the 4000 and Greenstar i.



  • Easy to install wall frame
  • Max power range
  • The dimensions
  • Heat cell platform
  • The Differences


Modern and sleek design

  • Versatility engineered
  • Efficiency improvements
  • Simple switch design
  • Improved serviceability
  • Simple switch design


Landlord Service

Whilst you may receive an income from your properties, it can be quite difficult to control their maintenance – particularly with difficult tenants. This is where some of the new features designed for landlords really come in handy.

“Service date” – This allows for a particular date in the future to be selected and it means that the tenants or homeowners will receive 14 days notice to arrange a booking for the boiler servicing date – this acts as a bit of an initial reminder.


Now the next feature is a bit more hardnosed, but it’s necessary when you can’t access your property.

The “Landlord” feature follows the same logic as the “Service Date”, but social housing providers can select a penalty if the initial reminder is ignored for 14 days or more. There are then 2 penalties:

  • Reduced DHW temp (Max 55 degrees Celsius)
  • Boiler turned off

The second of these penalties is a bit more severe, but the idea is that the tenant will probably think that there’s been a fault in the system and will then call the dedicated engineer. The engineer telephone can only be added for the landlord function.

Although it’s a bit unorthodox, it gets the job done – and you don’t want it on your head if your boiler is deemed unsafe to tenants.

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