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Worcester Bosch GB162 System Boiler

The Worcester Bosch GB162 System is available in a range of high heat outputs to suit the needs of commercial properties and large homes.

If you’re looking for a boiler with a high kW output, then the Worcester Bosch GB162 System should be able to meet all of your heating and hot water needs. Not only can it be installed on its own but also as part of a cascade system, allowing you to connect up to a maximum of 8 units. Although it packs a punch, this condensing model is fairly compact and can even be hung on a wall. And because it can stand up to the highest heating and hot water demands, the GB162 is perfect for large homes and commercial applications.

How Much Does this Boiler Cost?

The GB162 System by Worcester Bosch comes in four heat outputs of 50kW, 65kW, 80kW and 100kW, so the amount you’ll need to spend will depend on which size you require for your home or commercial site. At the moment, this model has a typical price tag between £1,980 and £3,600 but prices vary from one supplier to the next. You also need to factor in the cost of installation, which can sometimes cost more than the boiler itself. As some boiler providers offer special deals and reductions on their products, it’s worth shopping around to find the best quote.

How will I know if this Boiler is Suitable for My Home?

This particular model is designed specifically for large homes with more than one bathroom and much greater heating and hot water requirements. The GB162 is also ideal for some commercial sites, such as hotels and offices because up to 8 boilers can be combined to provide a higher output. As it’s a system boiler, you will need a separate hot water storage cylinder (but no tanks in the loft). It’s a really robust and powerful boiler that can provide hot water to your kitchen and bathroom taps, even when you’re using all of your taps at the same time.

When it comes to working out which kW output is right for your home, you’ll need to seek professional advice from a Gas Safe registered engineer. If you have extremely high demands, then you’ll probably need one of the higher kW output units. Nevertheless, you’ll still need to consult a professional to ensure you don’t end up with a boiler that is too big or too small for your property.

Is it a High Efficiency Boiler?

Yes. The GB162 System has an A ErP rating, meaning it ensures maximum efficiency and will help to reduce your carbon footprint. The boiler can even automatically modulate its output down to 30% or less to match your demand for heat, which is great news because this helps to save energy and money as well. It’s also compatible with intelligent modular energy management system controls to boost efficiency, performance and user comfort levels.

Does this Boiler have a Good Range of Controls and Features?

To be honest, all Worcester Bosch boilers are blessed with decent controls and impressive features. When it comes to the GB162 System, it boasts an award-winning ALU-Plus heat exchanger, frost protection and intuitive user controls. The boiler integrates with solar thermal installations and is compatible with a range of optional controls that provide load and weather compensation to boost efficiency and comfort. Not forgetting that the GB162 can work alone as one boiler or be connected to an additional 7 boilers to offer an output up to 800kW. If you decided to go down the multi-cascade boiler route, you’ll be given a tailor-made frame kit.

How long is the Warranty on this Boiler?

The GB162 System boiler is backed by a 2-year parts and labour guarantee as standard. Worcester Bosch often runs promotions that enable you to extend the warranty, so it’s always worth checking the brand’s website.

GB162 System Boiler Range

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
GB162 System 50SystemH – 1414 mm
W – 520 mm
D – 465 mm
N/A50 kWA 90% and above£1980
GB162 System 65SystemH – 1414 mm
W – 520 mm
D – 465 mm
N/A65 kWA 90% and above£2300
GB162 System 80SystemH – 1414 mm
W – 520 mm
D – 465 mm
N/A80 kWA 90% and above£2500
GB162 System 100SystemH – 1414 mm
W – 520 mm
D – 465 mm
N/A100 kWA 90% and above£3600

Summary of Important Information

  • Priced between £1,980 and £3,600
  • Heating output of 50kW, 65kW, 80kW or 100kW
  • Installed as a single boiler or as part of a multi-boiler cascade system
  • Dimensions of 1414mm (H) x 520mm (W) x 465 (D)
  • A-rated for efficiency
  • Solar compatible
  • 2-year warranty as standard

Pros and Cons

We’re pleased to report that we have mostly good things to say about the Worcester Bosch GB162 System boiler. Below, you’ll find a list of pros and just three cons!


  • Suited to commercial sites and large homes with high heating and hot water demands
  • Impressive heat outputs
  • Multi-boiler cascade packages for up to 8 boilers
  • No need for loft tanks
  • Intuitive user controls
  • Automatically modulates down to 30% or less to match heat demand
  • Extremely quiet in operation
  • Quick and easy to install
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Ultra-low NOx emission levels


  • Even though it’s compact for a powerful boiler, it’s still larger than most other system models and requires more space
  • Requires separate cylinder
  • 2-year warranty – would prefer a longer standard guarantee
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