gas boilers by Viessmann
Gas Boilers

Why choose a Viessmann Boiler ?

Everything you need to know about Viessmann Boilers

If you are upgrading or replacing your boiler, you will know that there are many different boilers built by a wide range of manufacturers. Viessmann boilers are one of the more popular choices for gas boiler replacement, but why would you choose a Viessmann boiler in favour of any other manufacturer?

All About the Viessmann Company

The Viessmann Group was founded over 100 years ago in Germany by Johann Viessmann and has been a family-owned business since then, with four generations leading the company. Since 2018, the Chairman of the Executive Board is Martin Viessmann, supported by co-CEOs Maximillian Viessmann and Joachim Janssen.


With more than a century of experience behind the company, you can be certain that the technology within Viessmann boilers is of a high standard, and the quality of German engineering is respected around the world. Viessmann have a great reputation for producing boilers, but also produce other energy efficient heating solutions including heat pumps, hot water cylinders, and solar thermal solutions.

Are Viessmann good boilers?

gas boilers by Viessmann

With their German origins, the question is not just if Viessmann produces good boilers, but more, “Are Viessmann Boilers any good in Ireland?”

Fortunately, the boilers produced by the company are designed to work perfectly in the Irish market, and they make a great solution for anyone looking for a new boiler. They are designed to be highly efficient which will help to save money on your energy bills, in addition to reducing the overall amount of energy you use. This efficiency will have a positive impact on the environment, especially if you are replacing a much older boiler.

Viessmann boilers are built for compatibility with other components within your heating system including renewable and alternative energy sources. They are a great choice for people who have an eye on the future, and they will not quickly become outdated.

In fact, they are packed with features that enable integration with modern home environments. This includes integration with smart homes, so you can speak to your digital assistant to control the heating or use an app from a remote location to switch the heating on (or off) before you get home.

Anything you would want a boiler to do (or to connect with), the Viessmann boiler range can do.

Are Viessmann boilers reliable?

During summer, you may not be concerned about the reliability of your boiler as much as you would in winter. There is less call for hot water and heating in the warmer months but have no fear – Viessmann boilers are reliable all year round.

Viessmann boilers have been awarded “Which?” Best Buy status for several years running, giving an indication of both their reliability and value for money. In multiple comparisons and tests, the Viessmann boilers consistently perform as well or better than their closest rivals, with a higher level of reliability.

The boilers also come with long guarantees, so should a problem be experienced, it can be fixed without any additional cost to the owner.

Are Viessmann boilers efficient?

The more efficient your boiler is, the less it will cost to run. If a boiler runs at 50% efficiency, half of the energy used to run it is wasted. Running at 100% efficiency is impossible as small losses will be made even in the best boilers, but modern boilers often run at higher than 90% efficiency.

Viessmann gas boilers are at the top of the list when it comes to efficiency with some of the boilers reaching 97% efficiency. This can give an energy rating of A, A+, or even A++, indicating that the boiler is super-efficient. The less energy that is required to heat your home and water, the lower your overall energy bills will be.

Which Viessmann boiler do I need?

Viessmann boilers are suitable for replacing many existing boilers and the exact boiler you need may vary. The Which? Survey recommended the following boilers as their Best Buys:

The most appropriate boiler for your home may be one of the above boilers or a different model depending on your needs and requirements. Important factors to consider include the size of your home, the number of bathrooms, the number of radiators, and the number of people living there.

Your heating and hot water usage patterns may also affect the choice – the most reliable way to determine which Viessmann boiler you need is to speak to the professionals at Precision Heating. We can advise you, using our years of experience, on the most suitable boiler for your home.

How much is a Viessmann combi boiler?

This will depend on which model of Viessmann combi boiler you choose. The price will vary as larger homes may need a more powerful boiler, which will cost more than a less powerful boiler. Generally, the price for a combi boiler is between €800 and €3000, so it is important to choose the right boiler for your property.

An overpowered boiler will provide no benefit, while an underpowered boiler will not heat your home effectively.

Why Choose a Viessmann Boiler?

Independent tests confirm that Viessmann boilers are extremely efficient and reliable, capable of saving money on your energy bills for many years to come. With long guarantees, you can be certain the boilers will keep working in the long term, and their flexibility and options for integrating with smart home functions make them a great choice for any home.

They are built from high-quality materials with technology that far exceeds all legal requirements for energy efficiency, providing real value for money.

When you choose a Viessmann boiler, you can be confident that your home will have energy-efficient heating and hot water whenever you need it.

Heat Pumps

New ultra-quiet Vitocal heat pumps launched in Ireland

Precision Heating has announced the launch of two new air source heat pumps with innovative noise reduction technology, the Viessmann Vitocal 200-A and 222-A.

“Both operate so quietly that they are suitable for densely built-up areas such as terraced housing estates, and both have high energy efficiency with low operating costs,” a statement from Viessmann read.

With outputs of 4 to 16 kW, and with a reversible circuit within a single unit to enable switching between heating and cooling, the Vitocal 200-A and 222-A are identical except that the 222-A has an integrated 220-litre domestic hot water cylinder.

The 200-A facilitates the integration of an external buffer, separate DHW cylinder and the control of an external heat source, such as an existing boiler.

Both heat pumps feature Viessmann’s new advanced acoustic design. This combines a sound-optimised fan, designed to harmonise the acoustic frequency range, with intelligent speed control to reduce airborne noise at full and partial-load operation. Viessmann said this effectively stifles the lower frequency sound of conventional heat pumps which can be perceived as disturbing. Noise pressure in night mode at a distance of three metres is 35 dB(A).

The Vitocal 200-A and 222-A are of compact monobloc design, with separate indoor and outdoor units connected by water pipes. Maximum flow temperature is up to 60C when the temperature outdoors is as low as -10C. The energy rating of both new Vitocal heat pumps is A++. The COP (coefficient of performance), according to the EN 14511 standard, is up to 4.72 (A7/W35) and up to 4.1 (A2/W35).

No minimum distance is required between the indoor and outdoor units, no refrigeration leak test is required because the cooling circuit is hermetically sealed, and no F-gas certificate is needed because the connecting pipes to the outdoor unit are filled with water. These new heat pumps are also simple to operate, via the easy to read graphic display, web and smartphone app.

“Since Viessmann launched the Vitocal range in 2019, many new build and retrofit homes around Ireland have been fitted with the Vitocal air source heat pumps, in some cases upgrading the energy rating to A1,” said Stephen Browne of Precision Heating, exclusive Irish agents for Viessmann. A recently completed scheme of three dwellings in Swords by G&S Fay Builders is one of the latest A-rated projects to feature the Vitocal heat pumps.

Article source written by Passive House