Worcester Bosch vs Viessmann Boilers: Which Is Better?

When it comes to Worcester Bosch vs Viessmann boilers, both stand out as top-tier choices for homeowners and landlords seeking reliable, efficient heating solutions. 

If you’re weighing these brands for your property—perhaps upgrading an old unit for better performance or compliance—this head-to-head review dives into their backgrounds, awards, ratings, warranties, and popular models to help you decide which might suit your needs in today’s energy-focused market.

Worcester Bosch vs Viessmann Boilers: At a Glance

Worcester Bosch and Viessmann both deliver high-quality gas boilers with strong efficiency and reliability, but they differ in origins, warranties, and model focuses—Worcester excels in UK-specific support, while Viessmann shines in innovative tech. To kick things off, here’s a quick comparison table highlighting key aspects for a side-by-side view.

Feature	Worcester Bosch	Viessmann
Origin	UK (Worcester, founded 1962, part of Bosch Group)	Germany (Allendorf, founded 1917, family-owned)
Efficiency Rating	Up to 94% (A-rated)	Up to 98% (A-rated)
Which? Score	80-85% customer satisfaction, frequent Best Buys	82-87% reliability, Best Buy for Vitodens range
Trustpilot Rating	4.5/5 (over 50,000 reviews)	4.4/5 (over 5,000 reviews)
Warranty	Up to 12 years with accredited installer	Up to 10 years with approved installer
Price Range (Unit Only)	£800-£1,500	£900-£1,800
Popular For	Robust UK support, user-friendly controls	Advanced modulation, hydrogen-ready tech

Why Consider Worcester Bosch Boilers?

Considering Worcester Bosch boilers is wise if you value a British-made brand with strong local support and proven track record in the UK market, offering dependable performance for everyday heating needs. 

Founded in 1962 in Worcester, England, and acquired by the Bosch Group in 1996, this company has become a household name for its focus on durable, efficient gas boilers tailored to British homes, blending German engineering with UK-specific innovations.

Worcester Bosch Boilers: Awards

Worcester Bosch boilers have scooped numerous awards, including multiple Which? Best Buys for models like the Greenstar series, recognising their reliability and customer satisfaction. 

They’ve also earned Energy Saving Trust endorsements for eco-friendly designs, underscoring their commitment to sustainable heating solutions that reduce carbon footprints in UK households.

Worcester Bosch Boiler Warranty

Worcester Bosch boiler warranty provides up to 12 years of coverage on parts and labour for select models when installed by an accredited engineer, giving you extended protection against unexpected breakdowns. This generous term reflects their confidence in product quality, with options to extend further through service plans for added peace of mind.

Worcester Bosch Popular Boiler Models

Worcester Bosch popular boiler models cater to various home sizes and budgets, with the Greenstar range leading in efficiency and compactness. Here’s a table of their top picks:

Model	Type	Output (kW)	Efficiency	Price Range	Best For
Greenstar i	Combi	24-30	94%	£800-£1,000	Small to medium homes, budget-friendly
Greenstar CDi Compact	Combi	28-36	94%	£900-£1,200	Space-limited properties, high hot water demand
Greenstar 8000 Life	Combi	30-50	94%	£1,200-£1,500	Larger families, smart app control
Greenstar Si Compact	System	25-30	94%	£850-£1,100	Homes with existing cylinders, easy upgrade
Greenstar Highflow CDi	Combi	29-41	92%	£1,300-£1,600	High hot water needs, built-in storage

Pros and Cons of Worcester Bosch Boilers

Pros of Worcester Bosch boilers include their robust UK manufacturing and extensive installer network, ensuring quick support for breakdowns. Cons might involve slightly higher upfront costs compared to entry-level brands, though offset by long-term savings.

• Pros:
  • Excellent UK-based customer service with widespread Gas Safe installers.
  • Long warranties up to 12 years for peace of mind.
  • High efficiency ratings reducing energy bills.
  • Wide model range suiting most property types.
  • Strong resale value for properties.
• Cons:
  • Premium pricing for top models.
  • Some older ranges less smart-tech integrated.
  • Warranty requires annual servicing to maintain.

Worcester Bosch Boilers: Trustpilot Reviews

Worcester Bosch enjoys strong customer feedback on Trustpilot, rated Excellent at 4.6 out of 5 based on over 49,000 reviews (as of early 2026). Users frequently praise the reliability of models like the Greenstar series, quick engineer response times, and overall product longevity. Positive comments highlight efficient heating, quiet operation, and helpful support. 

Some lower ratings mention occasional parts delays or noise in certain setups, but the overwhelming majority (around 85% 5-star) reflect high satisfaction for UK homeowners and landlords.

Why Consider Viessmann Boilers?

Considering Viessmann boilers is smart if you prioritise German engineering, innovation, and top-tier efficiency for long-term savings and eco-performance in your heating setup. 

Established in 1917 in Allendorf, Germany, as a family-owned firm, Viessmann has grown into a global leader in sustainable heating, blending precision craftsmanship with cutting-edge tech like hydrogen-ready designs for future UK energy shifts.

Viessmann Boilers: Awards

Viessmann boilers have garnered awards like Which? Best Buys for the Vitodens series, praised for reliability and low emissions. They’ve also won Red Dot Design awards for user-friendly interfaces and iF Design honours for innovative controls, reflecting their focus on both function and form in heating solutions.

Viessmann Boiler Warranty

Viessmann boiler warranty extends up to 10 years on parts and labour for models like Vitodens when fitted by an approved installer, providing solid coverage against defects. This term underscores their build quality, with options to extend via service plans for added reassurance.

Viessmann Popular Boiler Models

Viessmann popular boiler models emphasise efficiency and smart integration, with the Vitodens line leading for compact, high-output performance. Here’s a table of standout options:

Model	Type	Output (kW)	Efficiency	Price Range	Best For
Vitodens 050-W	Combi	19-35	98%	£900-£1,200	Budget-conscious small homes, easy install
Vitodens 100-W	Combi	11-35	98%	£1,000-£1,400	Medium properties, app control
Vitodens 200-W	System/Combi	1.9-35	98%	£1,200-£1,800	Larger homes, hydrogen-ready
Vitodens 111-W	Combi with Storage	19-35	98%	£1,300-£1,600	High hot water demand, built-in cylinder
Vitocrossal 300	Floor-Standing	13-60	97%	£1,500-£2,500	Commercial or large residences, modular

Pros and Cons of Viessmann Boilers

Pros of Viessmann boilers feature their superior modulation for precise energy use and hydrogen compatibility for future-proofing. Cons may include a smaller UK installer base compared to domestic brands, potentially longer wait times for parts.

• Pros:
  • Exceptional efficiency up to 98% for maximal savings.
  • Innovative smart features like weather compensation.
  • Hydrogen-blend ready for green transitions.
  • Quiet operation with advanced soundproofing.
  • Strong global reputation for durability.
• Cons:
  • Higher initial cost for premium tech.
  • Limited model variety in UK compared to rivals.
  • Warranty extensions require specific servicing.

Viessmann Boilers: Trustpilot Reviews

Viessmann Climate Solutions UK holds an Excellent rating of 4.5 out of 5 on Trustpilot, drawn from over 5,400 reviews (as of early 2026). Customers rave about the Vitodens range’s efficiency, smart app integration, and consistent hot water performance. Around 75-80% of reviews are 5-star, commending quiet operation and build quality. Criticisms are minor, often around initial setup complexity or support wait times, but overall sentiment positions Viessmann as a premium, reliable choice for modern UK heating needs.

Worcester Bosch vs Viessmann Boilers: Which Should You Choose?

Worcester Bosch vs Viessmann boilers both rank among the best in the UK, but the right choice depends on your specific priorities, property type, and long-term plans. In our experience advising homeowners and landlords, neither is outright “better”—each excels in different areas, so here’s how to decide based on key factors.

Choose Worcester Bosch if you value:

• Extensive UK-based support with a massive network of Gas Safe engineers and readily available parts—crucial for quick repairs in rentals or busy households.
• Longer warranties (up to 12 years) that give extra peace of mind without premium pricing.
• Proven reliability in British conditions, with frequent Which? Best Buys and high customer scores for everyday performance.
• A slightly lower upfront cost for comparable specs, making it appealing for budget-conscious upgrades without sacrificing quality.

Opt for Viessmann if you prioritise:

• Cutting-edge efficiency (up to 98%) and innovative features like superior modulation and hydrogen-ready tech, ideal for maximising savings and future-proofing against net-zero goals.
• Quieter operation and advanced smart controls for modern, open-plan living or eco-focused homes.
• Premium German engineering with exceptional build quality, often preferred by those willing to invest more for top-tier performance and lower long-term running costs.
• Strong environmental credentials, with models designed for hybrid setups like solar integration.

For smaller properties or straightforward replacements, Worcester Bosch often wins on value and support. For larger homes, high hot water demand, or a focus on sustainability, Viessmann frequently edges ahead. 

Ultimately, get quotes for specific models in your size range and check installer feedback—both brands shine when professionally fitted and serviced annually. 

Get a New Boiler Quote Today

Whether you’re leaning towards a Worcester boiler quote or a Viessmann boiler quote, now is the perfect time to explore your options. Both Worcester Bosch and Viessmann deliver upgrades that can slash energy bills and enhance reliability. Our experts at Boilers 2 Go are here to help—request a free, no-obligation new boiler quote today for personalised advice on these or other leading brands.

FAQs

How do warranties compare for accessories like controls?

Worcester offers 2-5 years on add-ons; Viessmann up to 5 years with system bundles.

What financing options exist for these boilers?

Both qualify for 0% finance through installers or green loans for eco-upgrades.

Are these brands hydrogen-ready beyond 20% blends?

Viessmann leads with trials up to 100%; Worcester focuses on 20% for now.

How do noise levels differ in open-plan homes?

Viessmann’s modulation is quieter; Worcester can be audible on startup.

Can these boilers integrate with solar PV?

Yes, both support hybrid setups for reduced grid reliance.