viessmann boiler

Viessmann Boiler

Viessmann Boiler – Best Kept Secret in Britain

While we’re all proud and like to support and back national/local “Made in Britain” products, sometimes it’s better to work on facts.  Especially when you’re making a buying decision as big as a new boiler or a central heating system.  It’s no secret that the Viessmann Boiler brand is German.  So is Worcester Bosch and Vaillant.  All these boiler brands have large factories and massive distribution centres around the Europe and UK, and all spare parts are stocked at Plumbase branches across the UK.

National pride and partisan tendencies aside, fact is Germans make great products.  And a Viessmann Boiler is no exception.  German engineering and efficiency is well known around the world.  Whether it’s German automobile companies like Volkswagen, Daimler, BMW, Mercedes-Benz, Porsche.  Or companies like E.ON, Siemens etc.  The Mercedes AMG F1 Team based in Brackley with engines made in Stuttgart is the perfect example of German engineering and British aerodynamics/mechanical prowess working together to conquer the Formula 1 world for the last 5 years.

I used to believe superiority of German engineering and efficiency was a myth and something Germans told themselves to feel better.  But no, it’s for real!  “Germaneering” is a term now.  Probably coined by millennials.


Why Buy a Viessmann Boiler?

About the Viessmann Group

viessmann boiler, viessmann factory

World leaders in the commercial heating space for years now, the Viessmann boiler brand is one of the leading international manufacturers of systems for heating, industrial energy and cooling.  Founded in 1917, Viessmann have over 12,000 employees across the world.  They are world renowned for coming up with innovative technology when it comes to boilers, heating systems, renewable technologies and ice store systems.  Furthermore, with 23 production divisions in 12 countries, subsidiaries and representations in 74 countries, and 120 sales offices around the world, the Viessmann boiler brand is truly a multinational giant.  They are responsible for heating and hot water for massive factories, large buildings and stadiums around the world.  In fact, the Wales Millennium Stadium and Principality Stadium in Cardiff, including their rival Vaillant’s factory in Germany have Viessmann’s commercial heating systems in place.  They are known for their reliability, durability and high levels of energy efficiency.  All of that commercial technology and expertise has made its way into their residential Viessmann boiler range.

In a substantial consumer survey of more than 10,000 UK residents done by a prominent independent review magazine awarded Viessmann a “Best Buy Boiler” for two years straight.  More information if you click the following link:  Viessmann awarded Best Buy for 2017 and 2018.

viessmann boiler, which best buy for 2018

If you would like an online quote for a Viessmann Boiler, please enter your postcode below and click the green button:


1. Viessmann Boiler Condensing Technology

viessmann boiler cross section

Good for the Planet & Your Energy Bills

One of the biggest reasons for replacing your old boiler with a modern condensing Viessmann boiler is energy efficiency.  Condensing boilers are water heaters fueled by gas or oil.  They achieve high efficiency (typically greater than 90% on the higher heating value) by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation.  Which would otherwise have been wasted.  This condensed vapour leaves the system in liquid form, via a drain.  In the UK, the use of condensing boilers is encouraged with financial incentives, like with the UK Government and OFGEM’s ECO Free Boiler Grants initiative, where you can get a brand new condensing boiler completely free or part funded to replace your older non-condensing boiler.

Even if you don’t qualify for a grant, you should consider replacing your old non-condensing boiler with a modern condensing boiler.  Because the savings in energy bills alone will pay for the new boiler and more over the long term.  You can save between £300 to £600 per year on energy bills according to the Energy Saving Trust.

Another reason to install a modern condensing Viessmann boiler is because they can modulate energy usage automatically when needed.  They modulate between 5kw and 30kw, whereas older boilers keep working on 30kw even when not needed.


2. Sustainable and Renewable Energy

viessmann boiler, energy efficiency, green energy

Saving energy is good for the planet.  Every single Viessmann boiler meets the requirements demanded by efficient condensing technology.  This means that 92% to 94% or more of the energy used is converted to heat.  By choosing a Viessmann boiler, you will not only save a lot of your hard earned money on energy bills, but also make a positive contribution towards protecting the climate and the environment by consuming lesser energy.  Thereby leaving a smaller carbon footprint.  Whichever way we can do our bit towards a positive contribution to our planet, no matter how little, it counts.  Think about the kind of world we’re leaving behind for the next generation.  Be the change you want to see in the world.

The combustion controller featured in the Vitodens 200-W Viessmann boiler is designed to automatically adjust to various gas types, including biogas mixtures, meaning these heating systems are equipped to be used with sustainable fuels.  Every Viessmann boiler in their range of heating systems also features systems utilising fully renewable technologies.  These include solar thermal systems to heat domestic hot water and provide central heating backup, plus biomass boiler options which utilise logs, woodchips and pellets to generate heat.  They also offer a number of hybrid devices, including heat pumps which exploit heat from the ground, the groundwater and the ambient air.

3. Weather Compensation – Achieve Sky High Energy Efficiency

When a Viessmann Boiler is used in conjunction with Weather Compensation, you can achieve amazing levels of energy efficiency, 98% and above!  Weather Compensation is a simple outdoor sensor, typically installed on a north-facing wall, which connects to the boiler.  The Weather Compensation technology harnesses nature’s signals outside to adjust the temperature inside your home.  Because every single Viessmann boiler is capable of using this technology, it can help you to save up to 15% more fuel each year, whilst also automatically ensuring a pleasant indoor temperature, whatever the weather, without you getting off your couch!

viessmann boiler weather compensation

The diagram above helps to demonstrate how this compares to a heating system without weather compensation, where the boiler runs very hot then very cold as it constantly ‘plays catch up’ to achieve the desired room temperature.

According to the temperature changes outside, a Viessmann boiler can respond and modulate the radiator temperature automatically to compensate.  This proactive mechanism means that while you’re lounging around in your house watching Netflix with a nice glass of Prosecco, while there’s a snowstorm outside, you won’t even notice that the temperature has changed outside.  So, even if more heat is lost through the walls of the building, because the outdoor sensor detects the temperature drop as soon as it happens, the boiler is able to raise the radiator temperature and keep the inside temperature stable.  With conventional boiler systems, the temperature is dependent on the room thermostat, which will only take effect after the inside of the building has become too hot or too cold.

In summary, weather compensation controls enable the boiler to respond to outside temperature changes and adjust the radiator output, to maintain a constant temperature indoors.

4. Patented Inox-Radial Stainless Steel Heat Exchanger

inox radial stainless steel heat exchanger

Boiler manufacturers around the world use two types of heat exchangers: Aluminium and Stainless Steel.

To understand what the primary heat exchanger does inside a boiler, we recommend reading How a Combi Boiler Works.

Obviously, as everyone knows and because it’s been proven countless times, stainless steel is vastly superior to aluminium when it comes to withstanding extreme temperatures.  Stainless steel is also highly resistant to corrosion in a wide range of pH levels, whereas aluminum will corrode much faster if the proper fluids are not used to produce and maintain a narrow pH range.  Aluminium Heat exchangers need special manufacturer recommended heat transfer fluids and inhibitors when starting up and maintaining the system.  If those fluids are not used, you could damage the heat exchanger.  And if the aluminium heat exchanger is damaged, your warranty will be void because the manufacturer will cite use of improper fluids.  In direct comparison, stainless steel heat exchangers (like the ones inside a Viessmann boiler) do not require special fluids, are compatible with plain clean water and commonly available propylene glycol.

Most of Viessmann’s rival manufacturers in the UK use an aluminium heat exchanger.  Very few manufacturers use stainless steel heat exchangers, or even manufacture them.  Almost all competitors use an aluminium heat exchanger manufactured by a 3rd party provider called Giannoni, a manufacturer based in France.  That has been known to cause a lots of problems.  For a boiler manufacturer, it is more expensive to source or manufacture stainless steel heat exchangers compared to aluminum.

viessmann boiler, stainless steel vs aluminium

As you can see in the diagram above, while aluminum is lightweight and has high thermal conductivity initially, but over the long run stainless steel will be a much better bang for your pound due to the longevity and much, much higher 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.  So, even if you buy a boiler with an aluminium heat exchanger at a lower price compared to a Viessmann boiler initially, over the years you will end up paying much more in energy bills and even repair because of a sub-standard heat exchanger.

Viessmann have pioneered and patented the Inox radial stainless steel heat exchanger, which is exclusive to their Vitodens range, and pretty much the best, highest quality heat exchanger in the market right now.  This helps Viessmann Boilers achieve the highest efficiency of 92% among its competitors, going as high as even 98% efficiency on higher end models like the Vitodens 200-W.  And because Viessmann manufacture the heat exchanger in-house, they can offer a more competitive price point.

For condensing boilers, a stainless steel heat exchanger can last up to 5-7 years longer compared to aluminum heat exchangers.  The grade of stainless steel used in a heat exchanger must also be highly resistant to corrosion, internally, and externally, so that the component retains its efficiency throughout the boiler’s operating life.

5. Built-in Shock Arrester

Reduce Water Hammer

If you haven’t come across a “water hammer”, you’re lucky.  Or you have a Viessmann boiler.  If you don’t know what a water hammer is, it’s loud rattling of your water pipes every time you open a tap in your house.  Water hammer is a pressure surge or wave caused when a fluid (usually a 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.

Anybody who’s experienced a water hammer problem knows what a nuisance it is.  In layman terms, it feels like a leprechaun is hammering your water pipes every time you call for water.  Even more enjoyable when someone in your house is taking a shower at 6 am on your weekend off.

This pressure wave can cause major problems, from noise and vibration to pipe collapse.  It is possible to reduce the effects of the water hammer pulses with accumulators, expansion tanks, surge tanks, blowoff valves, and other features.

Every single Viessmann boiler comes with a built-in shock arrester, reducing, limiting, or even avoiding the water hammer problem all together.

Why Should You Buy Your Viessmann Boiler from Boilerhut?

viessmann boiler, trustpilot reviews

Read our Reviews on Trustpilot

At Boilerhut we choose to work only with the best high-end brands, which is why Viessmann was a no-brainer.  We are also a Viessmann trained installer, which means not only do you get exclusive discounts, you also get exclusive, extended warranties of up to 10 years.

Just like advanced technology inside every Viessmann boiler, Boilerhut are working on next generation, cutting edge technology which help you to buy a boiler online much faster in the future.

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