What kind of boiler is the Viessmann Vitodens 100-W 26kW - standard, combi or system?

Looking for a gas heat only boiler for your house or flat? If you are, the Viessmann Vitodens 100-W 26kW boiler may be worth considering.

If your home has more than one bathroom or you have a large family that uses a lot of hot water, a heat only boiler (sometimes called a regular boiler, a conventional boiler or a standard boiler) is likely to be the best option for you. Heat only boilers require both a hot water or immersion cylinder and a cold water tank. Once the water in the cylinder is heated, you can use this hot water throughout the day and it can feed multiple taps and showers at the same time.

This is in contrast to a combi boiler which can only heat a limited amount of water at any one time. This can cause a problem if two or more taps and showers are being used simultaneously as the temperature, pressure and volume to all points will drop.

Heat only boilers allow you to program the times that you wish heat and hot water to be available. However, if you forget to do this and the immersion cylinder is empty, you may have to wait up to an hour before hot water becomes available again.

If your property already has a water tank and cylinder, it will nearly always be cheaper to replace like for like and not choose a different type of boiler. In addition to new pipework, you may need to replace older radiators that may be unable to cope with the higher water pressure delivered by other types of boiler.

Is the Viessmann Vitodens 100-W 26kW heat only boiler a suitable option for my house or flat?

It's best to choose a boiler whose size or "output" is right for your home.

The more hot water and heat you want, the higher the output level of your boiler should be. Output is measured in kilowatts and it describes the maximum level of power your boiler has to heat water.

If your output level is too low, your boiler will not have the power it needs to get your water as hot as you want it, particularly when there's a lot of demand for it. Choose a boiler whose output level is too high and you'll have all the hot water you need but will be paying too much for it through higher gas bills.

Which types of property would this Viessmann Vitodens 100-W 26kW heat only boiler be appropriate for given its output of 26 kW?

Most experienced Gas Safe engineers would likely recommend that, at this level of output, this Viessmann Vitodens 100-W 26kW heat only boiler would be a suitable choice for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

Viessmann Vitodens 100-W 26kW size

The Viessmann Vitodens 100-W 26kW is 600 mm in height, 375 mm in width and 285 mm in depth.

Is the Viessmann Vitodens 100-W 26kW a non-condensing or condensing boiler?

Condensing boilers convert the warmth present in flue exhaust gases and water vapour condensation into heat which they then recycle to increase the temperature of the colder water returning to your system.

We recommend that homeowners choose a condensing boiler like the Viessmann Vitodens 100-W 26kW for this reason - the more recent your model the better because the technology improves every year.

You'll benefit from lower quarterly gas bills and condensing boilers are also much more environmentally friendly.

Is the Viessmann Vitodens 100-W 26kW heat only boiler environmentally friendly?

How we heat our homes and the damage this does to the environment has become a pressing concern for many homeowners worried about the effects and impact of climate change.

About 14% of the greenhouse gases we produce in the UK come from the power needed for central heating. In bigger British cities, gas boilers are a significant source of nitrogen dioxide emissions.

Would installing a Viessmann Vitodens 100-W 26kW heat only boiler in your home help combat climate change? What do the figures suggest?

All boilers manufactured after April 2018 in the UK must be rated as an “A” on the SEDBUK grading system, subject to a minimum energy efficiency rating of 92% or above. Before that, the minimum rate was 88% - boilers with an energy efficiency of 88% or 89% were given a “B” rating. Boilers scoring 90% or more were given an "A" rating.

The energy efficiency rating for a boiler describes the amount of energy it uses and how much goes to waste in operation.

The Viessmann Vitodens 100-W 26kW has an efficiency rating of 94% with a SEDBUK grade of "A".

The Energy Related Products (ERP) directive is Europe-wide legislation designed to reduce harmful gas emissions at all points of a product's life cycle - from the production process to its actual end use right through to final disposal.

The Viessmann Vitodens 100-W 26kW has a rating of "A".

How long am I covered by the warranty for if the Viessmann Vitodens 100-W 26kW breaks down?

The Viessmann Vitodens 100-W 26kW boiler is provided with a parts and labour warranty lasting 5 years.