Vokera Evolve C 28C - a regular, combi or system boiler?

If you are considering installing a combi boiler in your house or flat, then the Vokera Evolve C 28C boiler is certainly worth investigating.

Combi boilers have much to recommend them - not least the fact that they save a lot of space. Combination (or combi) boilers were introduced by manufacturers in the 1970s to provide practical central heating and hot water distribution to smaller properties - remember that UK houses and flats tend to be among the smallest in the developed world.

Traditional boilers require one or more storage tanks to keep hot water warm and to store water for heating later. In contrast, combi boilers draw water directly from the mains supply and heat it instantly, removing the need for a storage tank. The heated water is then distributed to your taps and radiators on demand.

While combi boilers are suitable choices for many properties, especially those without a loft, there is also a disadvantage in using them. Water is heated instantly and the volume of water that can be heated at any one time is limited. This can result in less water being sent to taps and showers if more than one is being used simultaneously. In these instances, the water pressure to both points will drop.

Is the Vokera Evolve C 28C combi boiler a suitable choice for my property?

Selecting the right boiler for your home means choosing a boiler that is the right size. And, by size, we don't mean how big it is, we mean how powerful it is - the "output".

Your boiler’s output is a measurement of the power it has available to it to heat the water you need for your radiators or for when you turn on a tap, bath or shower. A higher output rate means it has more power and can heat more water.

It's important to choose an output that matches the demand for water in your home because if your boiler has too low an output, you'll often find only lukewarm water comes out of your taps or heats your radiators. If it’s too high, you’ll be paying more for your gas than you need to.

The Vokera Evolve C 28C combi has an output of 28 kW, so which types of property would this Vokera Evolve C 28C Combi boiler be appropriate for?

Most heating engineers would recommend this Vokera Evolve C 28C Combi boiler as a suitable option for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

In addition to output rates, you need to consider a combi boiler's flow rate when making your choice.

The flow rate of your boiler dictates the maximum volume of water (measured in litres per minute) that it can heat and distribute to your taps, showers and radiators at any one time.

However, a combi boiler like the Vokera Evolve C 28C can only heat and deliver water at the rate at which it actually enters your property. For this reason, you should also find out what the mains pressure to your house is before purchasing a boiler.

It's pointless spending more money on a boiler with a 17l/m flow rate if the local water pressure is 11l/m. To give you an indication of average water demand, a power shower typically requires 12 litres of water per minute and a basin tap 4-8 litres. This Vokera Evolve C 28C Combi boiler's flow rate is TBCl/m.

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 proportions of a Vokera Evolve C 28C boiler?

The size of the Vokera Evolve C 28C boiler is 955 mm high, 489 mm wide, and 333 mm deep.

Is this Vokera boiler non-condensing or condensing?

We recommend that, if possible, you choose a condensing boiler like the Vokera Evolve C 28C.

Condensing boilers are more energy-efficient. They achieve this efficiency by capturing the heat present in flue exhaust gases and water vapour condensation and recycling that heat to, for example, warm colder water coming back from your radiators.

By choosing the latest condensing boiler, you'll also notice a significant reduction in your gas bills, particularly if you're replacing a boiler more than 15 years old.

Is the Vokera Evolve C 28C combi considered environmentally friendly?

Many homeowners are now worried about climate change and the damage they do to the environment from heating their homes has become a subject of increasing concern.

The power we need for our central heating systems accounts for around 14% of the UK’s greenhouse gas production. There are often dangerous levels of ambient nitrogen dioxide gases in the atmospheres of British cities because of our use of gas boilers.

Will choosing a Vokera Evolve C 28C combi boiler for your home be positive for the environment? Let's examine the figures.

An energy efficiency rating of 92% or above is a legal requirement for all boilers manufactured and installed in the UK today. 92% is equivalent to a low-to-middle "A" grade on the "Seasonal Efficiency of Domestic Boilers" (SEDBUK) scale.

Energy efficiency measures how much energy a boiler uses and wastes in the course of its normal operation. The lower the waste, the lower your gas bills.

The Vokera Evolve C 28C was awarded an efficiency rating of "94%", equivalent to a "A" rating on the SEDBUK system.

Am I covered if my Vokera Evolve C 28C combi boiler breaks down?

The parts and labour warranty on the Vokera Evolve C 28C lasts for 10 years.