#2 Worcester Bosch Greenstar i System Boiler
Price (Installed): From £2500 (Inc. VAT)
|Model:||Greenstar i System Boiler|
|Available in:||9kW, 12kW, 15kW, 18kW, 21kW, 24kW, 27kW, 30kW|
|Energy Efficiency Class:||A Rated|
|Warranty:||Up to 10 years when installed by a Worcester Accredited Installer|
|Weight:||30.9kg (9kW, 12kW, 15kW, 18kW, 21kW, 24kW)
27.3kg (27kW, 30kW)
|Dimensions:||710mm (Height) x 400mm (Width) x 330 mm (Depth) (9kW, 12kW, 15kW, 18kW, 21kW, 24kW)
690mm (Height) x 390mm (Width) x 280mm (Depth) (27kW, 30kW)
Our engineers’ thoughts on the Worcester Bosch Greenstar i System Boiler
The Worcester Bosch Greenstar i System Boiler is one of a range of highly energy-efficient A-rated gas boilers.
Available in a vast array of outputs, the Greenstar i System Boiler comes in 9kW, 12kW, 15kW, 18kW, 21kW, 24kW, 27kW and 30kW.
Like the Viessmann above, it’s not just us who recommend this boiler, the Greenstar i System Boiler received a great score in the 2020 Boiler Brands report carried out by Which? and has been awarded Which? Best Buy status.
The Greenstar i range is split up into two sections, the boilers from 9kW to 24kW, and the 27kW and 30kW outputs of the boilers. The latter two boilers being part of a new generation of boilers from Worcester Bosch which are smaller, lighter and are designed to be able to fit in a kitchen cupboard. The main range being slighter larger and heavier and is designed for wall-mounting.
With this vast array of outputs, the Greenstar i range offers solutions for homes from a small flat or bungalow with up to 5 radiators, to a larger family home with up to 14 radiators.
Offering up to 94% efficiency, it is equivalent to the Viessmann Vitodens 100-W Gas System Boiler.
However, we have ranked this boiler lower than the Viessmann Vitodens 100-W as it has an aluminium heat exchanger, as opposed to Viessmann’s stainless steel heat exchanger. The issue here is that aluminium heat exchangers are much more prone to corrosion than their stainless steel alternatives and this will affect efficiency over time.
To Worcester Bosch’s credit and the reason we are recommending this boiler, they do offer a 10-year guarantee on the heat exchanger. This means that you are covered for 120 months against any issues with the heat exchanger due to any faults or defects relating to its manufacture. As part of this cover, the heat exchanger will be repaired free of any material charges during the 10 year period. However, you will be liable for labour costs if the boiler is out of the main product warranty period. This is a slight downside as the Greenstar i only comes with a 5-year warranty, as standard – this is extendable to 10 years though if installed by a Worcester Accredited Installer.
As we have mentioned regarding new boilers and their efficiency, there are reasons why the new system boilers are so good. One example on the Worcester-Bosch Greenstar i is that it recycles the heat from exhaust gases that would otherwise be lost through the flue. It then takes this heat and modulates its output independently for domestic hot water and central heating. This means that the Greenstar i is up to 30% cheaper to run than some older boilers.
- ERP rating: A
- 94% efficiency
- LPG compatible
- 5-year standard warranty
- Can be used with Greenskies solar panels for energy and cost savings
- Low energy pump reduces electrical usage
- Large Condensesure style siphon built into the boiler to eliminate frost risk
#3 Vaillant ecoTEC Plus System Boiler
Price (Installed): From £2300 (Inc. VAT)
|Model:||ecoTEC Plus System Boiler|
|Available in:||12kW (612), 15kW (615), 18kW (618), 24kW (624), 30kW (630), 37kW (637)|
|Energy Efficiency Class:||A Rated|
|LPG Compatible:||Yes (except 12kW and 15kW)|
|Warranty:||5-year guarantee, as standard. 7 to 10 year guarantee available if book a VaillantAdvance installer|
|Dimensions:||720mm (Height) x 440mm (Width) x 338 mm (Depth)|
Our engineers’ thoughts on the Vaillant ecoTEC Plus System Boiler
The Vaillant ecoTEC is Vaillant’s flagship boiler and was first launched in 2015. Like both the Viessmann and the Worcester Bosch we recommended before it, it has also been awarded Which? Best Buy status.
Our initial thoughts on the Vaillant ecoTEC Plus System Boiler is that it is an easy to use, reliable and quiet boiler. It’s not quite as efficient as the Viessmann and the Worcester Bosch but it still comes highly recommended by us.
We particularly like the ecoTEC Plus System Boiler due to its smart features such as its ability to recognise when you don’t need as much heating power, which can allow it to drop to using 16% of its maximum power saving on fuel and money.
We also like the quiet operation of the boiler, operating at just 44 dB and accredited by Quiet Mark, as a result.
With six outputs available from 12kW to 37KW, this is another boiler range which has an option available for the smallest properties to larger properties.
Importantly, we recommend this boiler due to the fact that it has a stainless steel heat exchanger, just like the Viessmann. This is important because of stainless steel’s resistance against corrosion and abilities in ensuring efficiency throughout the lifetime of the boiler.
Its straightforward backlit display, simple user controls including an on and off switch, reset button, pressure gauge and heating temperature control, all makes the ecoTEC Plus System Boiler an easy to use boiler.
Like the Worcester Bosch, the ecoTEC Plus System Boiler also comes with a 5-year guarantee, as standard – again though, this can be extended to up to 10 years if installed by an accredited installer, in this case that’s a VaillantAdvance installer.
The only reason we ranked this boiler higher than the Worcester Bosch option is due to the cost, whilst it’s only around £100 more to get the lowest output option installed, the higher output models can get much more expensive when being installed by a VaillantAdvance installer. That said, it is a great boiler nonetheless.
Vaillant ecoTEC Plus System Boiler Features:
- Stainless steel heat exchanger
- Advanced modulation during low usage to ensure maximum efficiency
- New high-efficiency pump to reduce energy consumption
- Stylish contemporary case design
- Backlit display
- ErP A rated for both hot water and heating efficiency
- Quiet Mark accredited
- Compatible with a wide range of heating controls including Vaillant’s vSMART™ smartphone app
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