Viessmann Vitodens 050-W 35kW - a regular boiler, combi boiler or system boiler?

You might want to consider the Viessmann Vitodens 050-W 35kW for your house or flat if you are looking for a combi boiler.

In older British homes, traditional boilers required you to find room for one or more storage tanks. One tank would keep hot water warm and the other stored cold water for later heating. Manufacturers introduced combi boilers to the UK in the 1970s so that homeowners could get the warmth and hot water they needed without having to sacrifice too much valuable space – remember that residential property in this country is among the smallest in the Western world.

Combi boilers deliver hot water to your radiators and taps using water they draw directly from the mains supply. As mains water travels through a combi boiler, the technology within it heats the cold water instantly and on demand. The hot water is then distributed throughout your house.

Combi boilers have one drawback, however: they can only heat a certain amount of water within a given time. For example, if someone uses the shower and another person uses the hot water tap at the same time, water pressure drops because water reaches each point differently.

Is the Viessmann Vitodens 050-W 35kW combi boiler suitable for my house or apartment?

You should make sure that the boiler you choose for your property is the right "size". And size doesn't mean its physical dimensions. Size means how much power it has - the "output".

A boiler's output level measures how much power it can use to provide you with the hot water you need for your radiators and taps. If a boiler has a high output rate, it can heat greater volumes of water.

If you choose a boiler with too low an output, you'll find that the water coming out of your taps and in your radiators won't be as hot as you want it to be. Choosing one whose output is too high means you'll pay more than you need to for the gas your boiler needs to work.

The Viessmann Vitodens 050-W 35kW combi outputs at a maximum of 33 kW, so which types of property would this Viessmann Vitodens 050-W 35kW Combi boiler be appropriate for?

Most experienced boiler engineers would recommend that this Viessmann Vitodens 050-W 35kW Combi boiler would be suitable for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

Homeowners considering fitting a combi boiler to their home need to consider flow rates as well as output rates.

The flow rate is a measurement of the volume of water a combi can instantly heat and send to the taps and radiators around your home. The higher the likely demand for hot water in your home, the higher your combi's flow rate should be. This Viessmann Vitodens 050-W 35kW Combi boiler's flow rate is 14 L/m.

Unlike heat only or system boilers, combi boilers don't store hot water in a tank for later use - instead, they draw it directly from the mains. This means that the volume of water your boiler can actually process is constrained by the flow rate of water in the mains pipe.

So, if you choose a combi boiler with a 15l/m flow rate but the flow rate in your mains pipe is 12l/m, the combi boiler's working flow rate is also 12l/m.

Combi boilers are also not always the correct choice for homes with multiple bathrooms, a high number of radiators, or where more than one family member will want to use hot water at the same time.

When our engineer comes out to quote you, they may recommend that you choose a heat only boiler or system boiler instead if your family's demand for hot water is higher than normal.

Viessmann Vitodens 050-W 35kW - size in millimetres

The Viessmann Vitodens 050-W 35kW is 707 mm in height, 400 mm in width and 350 mm in depth.

Is the Viessmann Vitodens 050-W 35kW a non-condensing or condensing boiler?

The Viessmann Vitodens 050-W 35kW is a condensing gas boiler - where possible, we always recommend to clients that they choose one of the very latest condensing boilers to take advantage of this technology, which improves year after year.

Condensing boilers are more energy-efficient as they capture and recycle the heat contained in flue exhaust gases and water vapour condensation. They then use this heat to perform tasks like warming up colder water returning to the boiler from the radiators.

By choosing a condensing boiler, you'll help the environment as well as save money on your gas bills.

Is the Viessmann Vitodens 050-W 35kW combi boiler good for the environment?

As the British public has become more conscious of climate change, many homeowners consider the environment when choosing how to heat their homes.

Nitrogen dioxide emissions in Britain's largest cities are at dangerous levels and this has been caused by gas boilers. In fact, 14% of the UK’s greenhouse gases are produced by central heating.

Will installing a Viessmann Vitodens 050-W 35kW combi in your home be a positive contribution to the environment? The figures below will tell you more.

Boilers manufactured and installed in the UK are assigned energy efficiency ratings following testing to an agreed set of standards. These scores indicate how much energy the boiler uses and how much goes to waste when it's in operation.

By law, boilers must achieve a SEDBUK rating of "A" subject to achieving a minimum of 92% energy efficiency. Prior to April 2018, the minimum was 88% (88% and 89% on the SEDBUK are graded "B" and 90% and above is graded "A").

The Viessmann Vitodens 050-W 35kW was awarded an efficiency rating of 93% with a SEDBUK band rating of "A".

The ERP, short for the Energy Related Products Directive, is a European directive aimed at encouraging manufacturers to create products that are environmentally friendlier at all stages, including during manufacturing, when the product is in active use, right through to the point of final disposal.

The Viessmann Vitodens 050-W 35kW has a rating of "A" for heat and "A" for hot water production.

How many years' warranty does the Viessmann Vitodens 050-W 35kW combi come with?

The Viessmann Vitodens 050-W 35kW boiler comes with a parts and labour warranty lasting 3 years.