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1,216 reviews

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1,216 reviews

Worcester Bosch 30i vs Vaillant ecoTEC Plus 832

How to Make a Cold House Warm

Worcester Bosch and Vaillant are two of the most popular boiler manufacturers in the UK, consistently achieving great reviews from both heating engineers and homeowners.

When it comes to finding a new combi boiler for a 3 bedroom house, the Worcester Greenstar 30i and Vaillant ecoTEC Plus 832 are amongst the best options available.

We’ve put them head-to-head to find out which is the better combi boiler: Worcester Bosch 30i vs Vaillant ecoTEC Plus 832.

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Brands behind the boilers

Worcester Bosch and Vaillant are UK boiler manufacturers part of larger organisations with a global reach but with their roots firmly remain in Britain.

Worcester Bosch is a British company, founded in Worcester back in 1962. Over 50 years later and Worcester Bosch are still manufacturing their market leading gas boilers in the Worcester HQ and it’s also where their customer service team are based.

Worcester Bosch boilers are so well received that they currently hold a Royal Warrant to have their boilers installed in The Queen’s Sandringham Estate.

Vaillant UK have been heating homes with their heating systems for over 140 years and have become part of Vaillant Group, an international company dealing in over 20 countries worldwide.

While Vaillant boilers have adopted German design, they’re still manufactured in the UK and their customer service team are based here too.

Worcester Bosch 30i vs Vaillant ecoTEC Plus 832

Now we know a little more about these market-leading boiler manufacturers, let’s begin our comparison of their combi boilers that are both ideal for a 3 bedroom house.

The table below shows the key specifications of the 30i and ecoTEC Plus 832 side-by-side.

Model Worcester Bosch 30i Vaillant ecoTEC Plus 832
Boiler Type Combi Combi
Output Rating to Central Heating (kW) 7.2 – 24 5.2 – 24.4
Maximum Heat Output for Hot Water (kW) 30 31.8
Efficiency Rating 94% 89.3%
ErP Rating Heat: A
Hot Water: A
Heat: A
Hot Water: A
Flow Rate 12.3 l/min 13 l/min
Heat Exchanger Material Aluminium Stainless Steel
Dimensions (HxWxD) 710 x 400 x 330mm 720 x 440 x 338mm
Weight (kg) 31.7 37
Standard Warranty 5 years (can be extended up to 7 years) 5 years (can be extended up to 10 years)
Potential Cost £1,075 £1,125

Compare combi boilers in these ranges with lower outputs in Worcester Greenstar 25i vs Vaillant ecoTEC Plus 825.

Worcester Bosch Greenstar 30i review

The Worcester 30i is part of the Greenstar range of combi boilers which also includes the 25i – another combi boiler both with a lower output rating for domestic hot water (25 kW) and slightly weaker flow rate (10.2 l/min).

  • Can fill a standard kitchen sink with hot water in only 45 seconds
  • A Condensate Siphon reduces risk of the condensate pipe freezing in temperatures as low as -15°C
  • Option to have a Greenstar System Filter installed to protect the central heating system from contamination – helping to extend its life and keep efficiency as high as possible.
  • Available with a wide choice of heating controls

Vaillant ecoTEC Plus 832 review

The ecoTEC boiler range includes a wide range of outputs from 25 kW up to 38 kW with the ecoTEC Plus 832 being the best option for 3 bedroom homes.

  • Hot water within 5 seconds
  • LPG model also available for properties off the gas network
  • Quiet Mark accreditation
  • Stainless steel heat exchanger aids heat transfer
  • Has the ability to use 16% of its maximum power, saving you fuel and money

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Output rating

A boiler’s output rating shows the level of demand for central heating and hot water the unit is able to meet.

Both models have a number in their name and this is representative of the hot water output – the Worcester 30i has a 30 kW output, while the ecoTEC Plus 832 output rating is 32 kW.

In terms of central heating, there isn’t much between the 24 kW output of the Worcester 30i and 24.4 kW of the ecoTEC Plus 832.


Boiler efficiency shows how much of the energy used by the unit actually goes towards providing heating and hot water for your home.

When it comes to natural gas boilers, there’s always some waste produced meaning that you’ll never find a 100% efficient gas boiler.

Out of these combi boilers, the Worcester Greenstar 30i is the most efficient with a 94% efficiency rating, while the Vaillant ecoTEC Plus 832 is 89.3% efficient. To put that into context, for every £1 you spend on heating your home, only 6p will be lost with the Greenstar 30i, whereas it will be almost 11p with the ecoTEC Plus.

Heat exchanger

The heat exchanger is an important part of a boiler as it transfers heat from the fuel, natural gas in the case of these boilers, to the water that will circulate around the central heating system.

When comparing combi boilers, it’s recommended to look for a stainless steel heat exchanger, like in the Vaillant boiler, as they have a number of benefits:

  • Extend the life of the boiler
  • Self-cleaning
  • Reduces the need for maintenance

The alternative to stainless steel is an aluminium heat exchanger, found in the Worcester 30i, which don’t last as long as stainless steel and needs an annual inspection by a heating engineer otherwise damage could be caused to the system.

Arranging an annual gas boiler service by a Gas Safe registered engineer is essential whether you have an aluminium or stainless steel heat exchanger. An annual service will not only help maintain the safe and efficient running of the boiler, they’re also essential to keep the warranty valid.

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Both the Greenstar 30i and ecoTEC Plus 832 come with a 5 year warranty as standard to see that you’re well covered in the unlikely event of a fault.

There’s an option to extend the warranty attached to both boilers when installed by an accredited installer:

  • Greenstar 30i: 7 year warranty when installed by a Worcester Bosch Accredited installer.
  • ecoTEC Plus 832: 7-10 years when installed by a Vaillant Advance installer.

Potential cost

When you’re comparing boilers, in the end, the deciding factor may well come down to which option is within your budget. There isn’t much to separate the Greenstar 30i and ecoTEC Plus 832 with the potential costs only sitting £50 apart:

  • Worcester Bosch Greenstar 30i: £1,075
  • Vaillant ecoTEC Plus 832: £1,125


On top of the cost of the unit itself, you’ll also need to consider the installation. The price of a boiler installation can vary greatly depending on a number of factors:

  • Where you live
  • Time of year
  • The installer carrying out the work
  • Where the unit is being installed
  • Type of boiler being installed and replaced
  • Size and weight of the boiler

The smaller size and lower lift-weight of the 30i could well see you save money on the installation over the 832 as this can make for an easier installation.

Fortunately, combi boilers are often the simplest type of boiler to install as there’s no need for any external tanks as cylinders that are needed for regular and system boilers.

While this is good news, prices can still differ greatly from installer to installer so we highly recommend comparing multiple quotes.

Using Boiler Guide, you can get free quotes from up to 3 Gas Safe registered engineers based in your local area by completing our simple online form. Once you have the quotes you can compare them to ensure you’re getting the most competitive price possible for your new boiler installation.

Winning boiler – Vaillant ecoTEC Plus 832

Price can often be the deciding factor when it comes to making such a big investment in your home but these units have a very similar price tag – not enough to make it a deciding factor.

In terms of efficiency, the 94% efficiency of the Worcester 30i is higher than the Plus 832 which means that you should effectively

Despite the Greenstar 30i having the higher efficiency, we’re going to crown the Vaillant ecoTEC Plus 832 as the winner thanks to a longer warranty being available and the stainless steel heat exchanger.

Alternative combi boiler options

The Worcester Greenstar 30i and Vaillant ecoTEC Plus 832 aren’t the only options available for 3 bed homes as Baxi, Ideal and Viessmann all have suitable combi boilers too.

Boiler Output Rating Efficiency Potential Cost
Baxi Platinum 28 28 kW 89% £1,025
Ideal Logic Max 30 kW 90% £980
Viessmann Vitodens 100-W 30 kW 94% £1,095

The Viessmann Vitodens 100-W in particular is well worth considering as an alternative to the Worcester 30i and Vaillant ecoTEC Plus 832.

  • LPG compatible
  • LCD touchscreen display
  • Take complete control of your central heating with the optional Tado smart thermostat
  • Stainless steel Inox-Radial heat exchanger
  • Standard 5 year warranty that can be extended to 10 years

Use our Boiler Comparison tool to compare up to 4 gas combi boilers and find the right one for the heating and hot water demands of your home.

Need a new boiler?


Get FREE quotes for a replacement boiler today.


Need a new boiler?

Get FREE no-obligation quotes now!

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