Is the Vaillant EcoTEC Exclusive IQ 843 boiler a combi, regular or a system boiler?

The Vaillant EcoTEC Exclusive IQ 843 is worthy of consideration if you're looking for a combi boiler for your flat or house.

Combination or combi boilers are highly efficient and save a lot of space in your home. Combi boilers heat water directly from the mains when you turn on a tap and, as a result, you don’t need a hot water storage cylinder or a cold water tank in the roof space.

These boilers are, therefore, suitable for smaller homes and especially those without a loft. They are also cost-effective as the water is heated instantly and distributed on demand rather than being stored. Combi boilers are the most popular type of boilers in the UK and replacing an older boiler with a new combi boiler will reduce your gas bills significantly.

However, there are downsides to this type of boiler. If you take a shower while someone else is using a tap, less water will reach each point of usage at lower rates of pressure and temperatures as combi boilers can only heat a certain volume of water at any given time.

Is the Vaillant EcoTEC Exclusive IQ 843 combi boiler from the EcoTEC Exclusive IQ range a suitable choice for my house or flat?

Whether this Vaillant ecoTEC Exclusive IQ 843 Combi boiler is right for where you live depends on its size or "output" level. Size does not mean its physical dimensions, however - it means how powerful it is.

Measured in kilowatts, a boiler's output level is an indication of the amount of power it has available to it to heat the water coming from your taps and for warming your radiators. The greater the output level, the more water it can heat.

If you choose a boiler whose output level is too low, you'll often find that the water is not as hot as you want it to be. If you choose a boiler whose level is too high, you'll be paying higher gas bills than you need to for years to come.

The output of the Vaillant EcoTEC Exclusive IQ 843 combi is 43 kW, so which types of property is this Vaillant ecoTEC Exclusive IQ 843 Combi boiler appropriate for?

Most experienced Gas Safe boiler installers would recommend this Vaillant ecoTEC Exclusive IQ 843 Combi boiler as a suitable option for larger properties including detached homes with no more than 15 or more radiators and two or more bathrooms.

The Vaillant EcoTEC Exclusive IQ 843 is a combi boiler, which that means that you need to take the flow rate (measured in litres per minute) into account as well as the output rate. This Vaillant ecoTEC Exclusive IQ 843 Combi boiler's flow rate is 18 L/m.

Combis draw water from the mains, instantly heating and distributing it where it's needed - taps, radiators, bathrooms, and so on.

However, this means that the flow rate of a boiler may effectively be capped by the flow rate of the mains water supply. For example, if your mains pressure is 12l/m, that is the maximum flow rate that your boiler can achieve even if you choose a boiler with a flow rate of 18l/m.

In addition, if your home has more than one bathroom, a high number of radiators, and more than one member of your household wants to use hot water at the same time regularly, the flow rate of both the boiler and the mains water pressure may not be high enough.

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.

What are the dimensions of the Vaillant EcoTEC Exclusive IQ 843 boiler?

The Vaillant EcoTEC Exclusive IQ 843 measures 720 mm high and 440 mm wide by a depth of 474 mm.

Is the Vaillant EcoTEC Exclusive IQ 843 condensing or non-condensing?

The Vaillant EcoTEC Exclusive IQ 843 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 Vaillant EcoTEC Exclusive IQ 843 combi environmentally friendly?

As more of us are increasingly concerned about climate change, how we heat our homes and its impact on the environment has become an issue of importance to homeowners.

We generate 14% of UK greenhouse gas emissions through centrally heating our domestic properties. Gas boilers are mainly responsible for harmful nitrogen dioxide emissions in larger British cities.

Do the available figures suggest that installing the Vaillant EcoTEC Exclusive IQ 843 combi in your property would be an environmentally friendly choice?

All boilers manufactured and supplied in the UK must achieve an energy efficiency rating of at least 92% (an "A" SEDBUK grade). This is higher than the previous 88%, which was a legal requirement prior to April 2018.

The energy efficiency rating is used to work out how much energy a boiler both uses and wastes when it's switched on and working correctly - its standard functioning and operation.

The Vaillant EcoTEC Exclusive IQ 843 is rated as 94% energy efficient, equivalent to a "A" SEDBUK rating.

The Energy Related Products Directive (ERP) is European legislation that applies to all products which use or consume energy during their lifespan, including during the manufacturing process and when they're in actual use, right through to the point of final disposal.

The aim is to encourage manufacturers to create new products that are kinder to the environment and create fewer harmful gas emissions.

The Vaillant EcoTEC Exclusive IQ 843 has an ERP Heat rating of "A" and an ERP Water rating of "A".

How long is the warranty period on the Vaillant EcoTEC Exclusive IQ 843 combi boiler?

The Vaillant EcoTEC Exclusive IQ 843 is supplied with a parts and labour warranty of 5 years.