Viessmann boilers, fitted and looked after by accredited engineers
We install and service every major boiler brand. When customers ask which we would choose, we usually say Viessmann, and here is the honest reason why.
Information on this page last reviewed July 2026.
Accredited Viessmann engineers, and the warranty it unlocks
Viessmann boilers are one of our preferred products. We are accredited Viessmann engineers, which means we are specialists in the installation, repair, maintenance and servicing of Viessmann heating systems and boilers. Our engineers have a wealth of experience and knowledge, giving them excellent diagnostic skills if something ever goes wrong.
The real benefit for you is the warranty. By using one of our accredited engineers, we can offer an extended warranty on your Viessmann boiler that non-accredited installers cannot. It is a credential most local rivals do not have.
The Viessmann Vitodens range
Three gas condensing boilers that cover most homes. We size and recommend the right one on survey; here is the plain-English version.
Vitodens 050-W
A compact, efficient option that suits most homes and budgets.
- Rated heating output 3.2 to 35 kW
- Compact design for easy installation
- Simple, cost-effective choice
Vitodens 100-W
A wall-mounted workhorse with an attractive price to performance balance.
- Rated heating output 3.2 to 32 kW
- Attractive price and performance ratio
- Simple and intuitive to use
Vitodens 200-W
The premium choice, ideal for larger homes and higher demand.
- Rated heating output 2.5 to 32 kW
- Lambda Pro Plus combustion controller
- Large colour touchscreen display
Why we usually recommend it
Efficient, well built, and it does the thinking for you
Viessmann are a leading manufacturer of heating systems, and their boilers are eco-friendly and efficient, which helps keep your fuel bills down. A further saving can be made by adding weather compensation.
Weather compensated heating systems use a small outdoor sensor to adjust the controls as the outside temperature changes. Rather than blasting on to maximum and switching off, the system runs more consistently, feeding energy into the building gradually and efficiently over a longer period. It is a big part of why a well set up Viessmann feels steady and costs less to run.
What accreditation gives you
- Engineers trained and approved by Viessmann
- An extended manufacturer warranty most local rivals cannot offer
- Systems designed and sized properly, not just swapped like for like
- Named, qualified engineers: Andrew Millward and Elis Harizi
What a Viessmann boiler costs
We quote on survey, but here is an honest guide so you can plan. As a typical UK range, a new Viessmann combi tends to land somewhere around £2,300 to £3,000 installed, depending on the model, your existing pipework and any controls or upgrades. A larger 200-W system for a bigger home sits above that. These are typical market ranges, not our fixed price.
An annual Viessmann service typically falls between £90 and £150 in the UK, with a full strip-down service higher. Keeping up the yearly service is also what keeps the manufacturer warranty valid, so it pays for itself in more ways than one.
Viessmann and the alternatives
We fit them all, so we have no reason to run any brand down. Here is a fair, quick read on how the main brands compare, so you can choose with your eyes open.
Viessmann
What we are accredited to fit. Premium build, strong efficiency, weather-compensation ready, and an extended warranty through accredited installers. Priced at the premium end, and in our view worth it.
Worcester Bosch
A hugely popular, well-supported brand with a strong reputation and wide parts availability. A safe, mainstream choice, and one we fit regularly.
Vaillant
Reliable German-engineered boilers with a loyal following and good long-term value. A strong all-rounder that we are happy to install.
Ideal
UK-made boilers that are kinder on the up-front budget while still offering solid warranties. A sensible pick when cost is the priority.
Baxi and ATAG
Dependable options with good value and, in the case of ATAG, long warranties. We fit both and will happily talk you through where they fit.
Already have a Viessmann boiler?
Keep it efficient and in warranty with an annual service by accredited engineers. Our Viessmann boiler service guide explains exactly what a proper service includes and what it costs.
Viessmann questions, answered
Do you only fit Viessmann?
No. We install and service all the major boiler brands, including Worcester Bosch, Vaillant, Ideal, Baxi and ATAG. Viessmann is the brand we most often recommend when a customer asks us to choose, but the decision is always yours and we fit what suits your home and budget.
What does being Viessmann accredited actually mean?
It means our engineers are trained and approved by Viessmann to install their boilers, which unlocks an extended manufacturer warranty that non-accredited installers cannot offer. It is a genuine, checkable credential, not a badge for the website.
Which Viessmann boiler is right for my home?
It depends on your property size, how many bathrooms you run and your budget. The Vitodens 050-W and 100-W suit most homes on price and performance, while the 200-W is the premium choice for larger properties. We size and recommend on survey.
What does a Viessmann boiler cost?
As a typical UK guide, a new Viessmann combi tends to land somewhere around £2,300 to £3,000 installed, and an annual service usually falls between £90 and £150. These are ranges to help you plan; we confirm your price on survey.
Related pages
Where to go next for a new boiler, a service, or the rest of our heating work.
Real, named, qualified
The engineers who turn up
Two engineers, both Gas Safe registered under registration 586325. When you book Home Comfort Assured, this is who does the work.
Andrew Millward
Founder and heating engineer
- 40+ years experience
- Heat Geek Elitist
- Viessmann accredited
Andrew has over 40 years in the trade and specialises in fault finding, boiler and heating repairs, and the design of energy efficient systems like heat pumps and underfloor heating.
Andrew on YouTube
Elis Harizi
Director and plumbing & heating engineer
- Plumbing since 2007
- Heat Geek member
- Gas qualified
Elis trained as a plumber in Greece in 2007, moved to England to gain his gas qualifications, and now designs and installs energy efficient heating as a Heat Geek member.
Thinking about a Viessmann boiler?
Call and speak to an accredited engineer, or request a fixed quote. We fit every major brand and will give you honest advice, not a sales pitch.