The Worcester Bosch 4000 30kW Combi is perfectly designed for heating medium-sized homes with up to 15 radiators. It’s A-rated for energy-efficiency so you can be sure it’ll keep your home warm and your bills low. This boiler features a modern new design, an easy to use full colour text display and it’s quiet too. The Greenstar 4000 has a wide power range to meet all of your heating and hot water needs, whilst doing so efficiently.

It comes fully installed by a British Gas engineer. British Gas have thousands of expert installers available across the UK. You can be sure of a safe, reliable and stress-free service, every step of the way. British Gas will also install a Hive Thermostat Mini with hub and receiver, so you can be in control of your heating sytem wherever you are.

What is a combi boiler?

A combi (short for combination) boiler is the most compact option because it generates both your heating and hot water from a single unit, usually wall hung. With a combi boiler, there’s no need for a separate hot water tank.

How do combination boilers work?

Combi boilers are connected to the mains cold water supply and can heat water on demand. They burn fuel when you ask for hot water and have an integral heat exchanger that then gets hot enough to instantaneously heat the cold water from the mains supply as it flows over it.

Key Benefits:

Guaranteed -10 years peace of mind subject to annual boiler service after your first year (not included).

Quiet Mark certified

QuickTap – No more wasting water waiting for it to heat up

Energy saving - A-rated, energy efficiency saves on bills

Planet-friendly packaging - Great for your home and the environment

Includes Hive Mini programmable thermostat with Hub and receiver.

What's Included:

- Call with expert at British Gas to confirm installation details.

- Combi to combi boiler replacement.

- Worcester Bosch horizontal flue.

- System cleanse - Chemical flush.

- Fernox water treatment.

- Installation of magnetic filter.

- Hive Mini programmable thermostat with Hub and receiver.

- Internal condensate connection.

- Filling link.

- Waste collection and disposal (in accordance with health and safety regulations).

- Electrician on site to complete all electrical connections to your boiler to the required regulations.

Getting It Installed:

1. Place your order and accept the estimated price (based on a simple swap of an existing combi boiler in the same place).

2. British Gas will contact you for more information about your installation. At this point, there may be some additional costs based on your home and current boiler – but your engineer will talk you through all the details.

3. Once you’re happy, accept your quote and book your installation date.

4. British Gas will send an expert engineer to install your new boiler. They’ll also give you a final price in case any further work is needed. Then once it’s installed, they’ll activate your 10-year warranty.

Not Included - Can be purchased directly with British Gas:

- Any other installation type other than combi to combi swap.

- Moving the boiler and pipework to a different location.

- Annual boiler services.

- Alternative Flue configuration or materials.

- Asbestos removal.

- Scaffolding.

- British Gas home care products.

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