Is the Viessmann Vitodens 100-W 26kW a standard, combi or system boiler?

The Viessmann Vitodens 100-W 26kW is a heat only boiler you may wish to consider if you want this type of boiler for your house or flat.

Heat only boilers (often called regular boilers, conventional boilers or standard boilers) keep hot water warm in an immersion cylinder (generally installed in a utility room or landing cupboard) and also include a cold storage tank that holds water for heating later.

As with all boilers, you set the times and days you want your hot water and central heating to be on. However, if you forget to program the boiler and there's no water left in the immersion cylinder, you may have to wait up to an hour for hot water to return.

A heat only boiler is best for homes with more than one bathroom or a larger family - immersion cylinders store a lot of water and they can deliver water at the same temperature, volume and pressure to multiple points in your home at the same time. This is in contrast to the more popular combi boilers that draw water from the mains and heat it on demand - these types of boiler have volume capacity issues.

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

Whether this Viessmann Vitodens 100-W 26kW heat only boiler is right for where you live depends on its size or "output" level. Size does not mean its physical dimensions - it means how powerful it is.

The output level of a boiler tells you how much power it has to heat the water coming from your taps and warming up your radiators. The higher the output level, the greater the volume of water it can heat up.

If the output (measured in kilowatts) is too high, you'll pay higher gas bills and your water will be piping hot. Too low and the water coming out of your taps and being fed into your radiators will often be lukewarm.

The Viessmann Vitodens 100-W 26kW heat only outputs at a maximum of 26 kW, so which types of property would this Viessmann Vitodens 100-W 26kW heat only boiler be appropriate for?

Most heating engineers would recommend that this Viessmann Vitodens 100-W 26kW heat only boiler would be suitable for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

Making space for the Viessmann Vitodens 100-W 26kW

The dimensions of the Viessmann Vitodens 100-W 26kW are 600 mm [H] x 375 mm [W] x 285 mm [D].

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

The Viessmann Vitodens 100-W 26kW is a condensing gas boiler - this is the type of boiler we recommend to most clients because they're better for the environment and they will save money on annual fuel bills.

A condensing boiler captures and recycles the warmth still present in both the flue exhaust gases and water vapour condensation created when gas is burned to provide your boiler with power.

This means it needs less gas to operate and it uses this extra energy to perform a number of tasks, including heating the colder water that comes back to the boiler from the radiators in your home.

How does the Viessmann Vitodens 100-W 26kW heat only boiler rate environmentally?

Environmentally-friendly heating has become an important issue for homeowners concerned about the accelerating pace of climate change.

Central heating creates 14% of the UK’s greenhouse gases. And in Britain's larger cities, gas boilers are responsible for dangerous levels of nitrogen dioxide emissions.

Do the available figures suggest that installing the Viessmann Vitodens 100-W 26kW heat only in your property would be an environmentally friendly choice?

By law, the minimum level of energy efficiency for boilers manufactured in the UK is 92%, equivalent to a good SEDBUK “A” rating. Prior to April 2018, the minimum was 88% - boilers whose energy efficiency levels were 88% or 89% were given a "B" rating on the SEDBUK scale and those at 90% or higher were given an "A".

The energy efficiency rating awarded to each boiler indicates the amount of energy that is wasted when in operation.

Following testing, the Viessmann Vitodens 100-W 26kW was given a 94% energy efficiency rating and a SEDBUK grading of "A".

The Energy Related Products (ERP) Directive is important European legislation that aims to limit energy use and harmful gas emissions during the manufacturing process, when the product is in use, and after it is disposed of.

For the Viessmann Vitodens 100-W 26kW, the ERP Heat rating is "A".

How long is the warranty offered by the manufacturer for the Viessmann Vitodens 100-W 26kW boiler?

The Viessmann Vitodens 100-W 26kW is covered by a parts and labour warranty of 5 years following installation.