Worcester Bosch vs Viessmann – Which is the Better Boiler?
Worcester bosch vs Viessmann comparison is now gaining traction in the UK, as more and more people are looking at the latest Best Buy Boiler report for 2018.
Worcester Bosch boilers are well-established and award-winning in the UK, and their boilers have been installed in over 1 million homes across the UK. Their exposure is second to none compared to every other boiler company.
Meanwhile over in Germany and Europe, Viessmann‘s already massive market share continues to go up. In the past decade, Viessmann have covered major technical ground and are now definitely one of the best boilers in the world.
If you would have asked me 12-13 years ago which boiler is best, I probably would have given you a different answer. But times change, technologies evolve, and things change for the better. Today, when it comes to Worcester Bosch vs Viessmann, I’d say Viessmann edges it.
In May 2017 and 2018, one of UK’s largest independent consumer body surveyed more than 10,000 boiler owners online to ask them about their experiences with their boilers, which covered any breakdowns, problems, annoyances with their boiler. From this they determined the reliability rating for each brand. They also asked them to assess how satisfied they were, and how likely they would be to recommend their brand of boiler.
On top of gathering views of owners of each brand of boiler, they also collected opinions of heating engineers who work with boiler installations and repairs every day.
In April 2017 and 2018, they surveyed more than 200 heating engineers about their views on boiler build quality and their likelihood to recommend a boiler brand. The availability of parts and spares. How easy it is to fix a common fault with each brand of boiler. And how easy it is to service them.
Worcester Bosch vs Viessmann both are unanimously regarded as 2 of 5 Best Buy Boilers from 300+ boilers tested.
Let’s take a deeper look at both boilers and simplify it further for you:
Our in-house heating experts and experienced engineers who have been installing boilers for decades now, say Worcester Bosch boilers’ build quality is among the best. They offer a 5 year warranty as standard. Should any time the thermostat fail, there is a manual override switch, which can save you on a cold winter night. Worcester Bosch claim 1 out of every 10 boilers in the UK is theirs. This claim may not be backed by actual figures. In any case, we believe the landscape may be changing soon. Don’t get us wrong, whatever is the verdict on Worcester Bosch vs Viessmann, Worcester are still one of the best boilers available in the UK. They are market leaders for a reason.
Some features of Worcester Bosch boilers below:
- Well known brand in the UK, a lot of satisfied customers.
- Simple boiler controls with clear information display.
- Low risk of condensate pipe freezing in severe weather.
- Wide choice of controls enables greater comfort and economy.
- Low energy pump reduces electrical usage.
- Instantaneous hot water, always available.
- Achieves an A+ ErP package efficiency rating for heating when installed with a Wave smart internet connected control.
- High hot water flow rate.
- Simple boiler control knobs with clear temperature display.
- Frost protection is included, reducing frost risk if installed in a garage or a loft.
- Larger two bathroom properties can be supplied by higher output options.
- Inbuilt keyless filling link making it easy to refill your system.
- Large CondenseSure style siphon built into the boiler – eliminates frost risk.
Viessmann Boiler Review – Energy Efficient Heating
To read a detailed review of the Viessmann Vitodens 100-w, please click here
Fighting from the red corner in the Worcester Bosch vs Viessmann fight, Viessmann were (and are) world leaders in the commercial heating space long before they entered the UK domestic boiler market. Viessmann commercial heating systems keep some of the largest buildings in the world, including stadiums, royal palaces and rival boiler manufacturer factories (*cough* Vaillant factory *cough*).
Viessmann have also continued to innovate, which shows in their extensive boiler range. This has meant they’ve left the competition in the dust in some areas. All Viessmann boilers are condensing boilers, which means they not only utilise the heat generated by combustion, but also create more heat by recycling the water vapour content. This enables them to extract all of the heat contained in the flue gases and convert it into heating energy. That would get wasted in an older non-condensing boiler.
All boiler manufacturers in the UK have condensing boilers now, so this isn’t something unique to Viessmann. But we do believe Viessmann condensing boilers are definitely at the top of the pile.
Some features of Viessmann Boilers:
- High quality Stainless Steel Inox-Radial Heat Exchanger
- Long Term Reliability, Durability and High Energy Efficiency
- High Efficiency – 94% and 98% and above on Vitodens 200-W
- Works with Weather Compensation or Nest
- In-Built Shock Arrester (Avoid Water Hammer Problems)
- Combined PRV (Pressure Release Valve) and Condensate Pipe (Easy Installation)
- Compact design and low weight
- One of the quietest boilers in the UK
- Available in outputs from 4.7 to 35 kW
- Class A rated for Energy Efficiency
- Backlit LCD Touch Screen for Easy operation
- Extended 10 year warranty available if installed by Boilerhut
Winner: Viessmann. But why?
Deal Changer = Stainless Steel Heat Exchanger – Look ma, it rhymes!
What really makes Viessmann boilers stand out in the Worcester Bosch vs Viessmann fight is the high performance, patented Stainless Steel Inox-Radial Heat Exchanger. This is unique and exclusive to the Viessmann boiler range. All their rivals, including Worcester Bosch and Vaillant etc. use an aluminium heat exchanger, in most cases sourced by a third party manufacturer based in France.
So What’s the Big Deal with Stainless Steel?
In the Worcester Bosch vs Viessmann fight, we believe this is a massive vote in Viessmann’s favor. Stainless steel is highly resistant to corrosion in a wide range of pH levels. Whereas for aluminum, if the proper fluids are not used to produce and maintain a narrow pH range, it will corrode much faster. Without the use of proper fluids, you may damage an aluminium heat exchanger.
And if you do damage the heat exchanger, your warranty will be voided, because the manufacturer will cite improper use of fluids. In direct comparison, stainless steel heat exchangers do not require special fluids, are compatible with plain clean water and commonly available propylene glycol.
Stainless steel is also more expensive to source or manufacture compared to aluminum. So, what makes more financial sense for a boiler manufacturer? While aluminum is lightweight and initially has better thermal conductivity initially, but over the long run stainless steel will be much better value for money due to the longevity and better resistance to corrosion. Aluminum will rust, corrode, warp, and break down long before stainless steel, so investing in a boiler with a quality stainless steel heat exchanger will increase the useful life of your boiler.
Below is a comparison of the lifespan of a stainless steel heat exchanger (in blue) vs an aluminium heat exchanger (in red).
Built-In Shock Arrestor
As the Worcester Bosch vs Viessmann fight carries on, Viessmann lands another uppercut, as their boilers have a built in shock arrestor. If you’ve never experienced a water hammer problem, first be grateful. Second, make your central heating future proof and water hammer proof by buying a Viessmann boiler. In simple terms, water hammer feels like a leprechaun hammering your water pipes every time you open the taps in your house.
In more technical terms, water hammer is a pressure surge or wave caused when liquid (but sometimes also a gas) in motion is forced to stop or change direction suddenly (momentum change). A water hammer commonly occurs when a valve closes suddenly at an end of a pipeline system, and a pressure wave propagates in the pipe. It is also called hydraulic shock.
PRV and Condensate Combined
Throughout the Viessmann boiler range, the pressure relief pipe and condensate are combined. This gives the installers more choice in siting the boiler, allowing a lot more flexibility with replacement, retrofitting, and new boiler installations.
Higher Efficiency for Longer
As shown in the heat exchanger comparison diagram above, longevity becomes a big factor in the Worcester Bosch vs Viessmann fight. The use of condensing technology in Viessmann boilers means they can achieve efficiency of up to 98% (on select models) and are rated energy efficiency class A. The heat exchanger cools the flue gases before they escape through the chimney. In doing so, the water vapour contained in these gases is deliberately condensed. This releases additional heat which is transferred into the heating system.
This also helps them modulate energy usage, so they hover between 5 KW and 30 KW as and when needed, saving you a tonne on energy bills.
This energy efficiency means you are saving a tonne on energy bills. And by using less energy, you’re doing your bit for the planet by reducing your carbon footprint and leaving a better planet for our future generations. Well done! The stainless steel inside Viessmann boiler will last much longer without losing efficiency.
UK Best Buy Boiler Award
Viessmann have been awarded a “UK Best Buy Boiler” award by one of the most prominent independent consumer survey magazine for the second year running in 2018. To read the report, please click here.
Warranty is King
Last knockout punch in the Worcester Bosch vs Viessmann fight is landed by Viessmann again. While Worcester Bosch gives you 5 years standard warranty, Viessmann ups that to 7-10 years’ warranty, and a slew of discounts if you get it installed by a Viessmann approved/trained installer or a premium partner like Boilerhut. That’s almost double the warranty time, on top of Viessmann being superior in terms of technology and energy efficiency.
High Quality Boiler Installations from Boilerhut
From your first online boiler quote or a phone call/email to final installation, Boilerhut can install either Worcester Bosch vs Viessmann, Vaillant or Ideal boilers within a few days.
All our engineers are Gas Safe, OFTEC and APHC registered/accredited. And because we are Viessmann Premium Partners, our engineers are trained to the highest standard and have undergone a rigorous training course. Also in addition to the training, we have a very close working relationship with Viessmann which means we have access to longer warranties, discounted parts and direct access for service and warranty issues.
We can get most issues sorted within 24-48 hours.
Don’t take our word for it, read our customer reviews on Trustpilot. We are rated excellent with 5-stars.
A lot of other companies take up to two weeks AFTER the survey visit for a boiler installation. Boilerhut are working on exciting new technology which will reduce that time to just a few days. You can now get an online estimate/quote within minutes.