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Keston Combi 35 boiler

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Plumbproud rating

54.10%

Keston Combi 35 Combi Gas boiler

We scored this Keston Combi 35 Combi boiler at 54.10% on our internal benchmarking system. To determine a score, we take into consideration a number of different factors including the boiler's energy efficiency, installed price, likely running costs, and the length of the manufacturer's warranty.

We would expect that, unless there are complications during fitting, this Keston Combi 35 Combi boiler would cost £2,400 supplied and professionally installed through PlumbProud.

To receive a free quote on the Keston Combi 35 boiler, as well as professional advice on whether it will meet the needs of your home, simply enter your postcode in the quote box on this page, click here to email us, or call 01604 343053.


Installed price around

£2,400

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Keston Combi 35 Combi Gas boiler frequently asked questions

What type of boiler is the Keston Combi 35 - regular, system or combi?

You might want to consider the Keston Combi 35 for your house or flat if you are looking for a combi boiler.

In the past, most boilers needed one or more storage tanks to operate - one to store warm water and the other for storing water to be heated later. But storage tanks are problematic in properties where space is at a premium and particularly where there is no loft. Many properties in the UK are small and so manufacturers introduced combi boilers in the 1970s to eliminate the need for tanks.

With a combi boiler, the hot water for your radiators and taps is delivered on demand. The boiler instantly heats water it draws directly from the mains internally. It then distributes the heated water around your home at mains pressure as you need it.

It is important to bear in mind that, while combi boilers have many benefits, they can only heat a certain volume of water at any given time. This means that, if you run a shower at the same time as someone else is doing the washing up in the kitchen, the volume of water passing to each point will drop, causing a fall in pressure.

Is the Keston Combi 35 combi boiler the right choice for my house or apartment?

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 Keston Combi 35 combi has an output of 35 kW, so which types of property would this Keston Combi 35 Combi boiler be appropriate for?

A PlumbProud heating engineer would recommend that this Keston Combi 35 Combi boiler be installed in larger properties including detached homes with 15 or more radiators and two or more bathrooms.

You should also consider a combi boiler's "flow rate" when making your choice.

The flow rate indicates how much water it can take from the mains supply at any one time (measured in litres per minute), which it then heats and distributes to different points in your home like your bathroom, kitchen and radiators. This Keston Combi 35 Combi boiler's flow rate is 15 L/m.

Combi boilers have no storage tanks like system or heat only boilers. This means that if the water pressure where you live is low, there's no benefit in spending money on a combi with a high flow rate because a high flow rate doesn't mean it can draw any more water from the mains.

In addition, there might be lots of people in your household who want to use hot water at the same time while also having the central heating on. Given that average mains pressure in the UK is between 10 and 12 litres per second and a power shower usually requires about 12 litres of water per minute, a combi boiler might not be the right choice for you and your family.

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 size is a Keston Combi 35 boiler?

The Keston Combi 35 is 700 mm tall, 395 mm wide, and 278 mm deep.

Is the Keston Combi 35 a condensing or non-condensing boiler?

How does the Keston Combi 35 combi boiler rate environmentally?

Price and performance are two important issues when choosing a boiler but now, for many people in the UK, so is the environmental impact of how we heat our homes and its effect on climate change.

Central heating accounts for 14% of greenhouse gas emissions in the UK. In larger British cities, gas boilers emit dangerous levels of nitrogen dioxide into the atmosphere.

Will choosing to install a Keston Combi 35 combi in your home help the environment? Let's review the figures.

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 Keston Combi 35 has an efficiency rating of 89.6% with a SEDBUK grade of "TBC".

In 2015, new legislation was introduced by the EU to encourage manufacturers to develop more energy-efficient products that emit fewer harmful gases throughout their lifetime.

The Energy Related Products Directive (ERP) applies to all products that consume energy, including during the manufacturing process, at the point of final disposal, and all points in between.

The ERP rating of the Keston Combi 35 is "A" for heat and "A" for hot water.

Am I covered if my Keston Combi 35 combi boiler breaks down?

The parts and labour warranty on the Keston Combi 35 covers all repair-related costs for 5 years while the heat exchange warranty covers you for [Heat Exchange Warranty] years.


Keston Combi 35 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating89.6%
P/L Warranty5 Years
Output in kW35 kW
Height700 mm
Width395 mm
Depth278 mm
MountingWall
Flow rate15 L/m
ERP HeatA
ERP WaterA

The top 10 rated Gas Combi boilers

Using the Plumbproud scoring system, the current 10 ten Gas Combi boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 82593.35%
2Vaillant ecoTEC Plus 83292.98%
3Worcester Bosch Greenstar 2000 25kW92.89%
4Viessmann Vitodens 050-W 29kW92.66%
5Vaillant ecoTEC Plus 83592.60%
6Worcester Bosch Greenstar CDi Compact 2892.57%
7Vaillant ecoFIT Pure 82592.39%
8Vaillant ecoTEC Plus 83892.16%
9Vaillant ecoTEC Exclusive IQ 83591.90%
10Vaillant ecoTEC Pro 2491.77%

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Keston Combi 35 boiler

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Keston Combi 35 Combi Gas boiler

  1. Home
  2. Keston Combi 35
Plumbproud rating for this boiler
54.10%

According to our PlumbProud boiler quality scoring system, we rate this model 54.10%. We rank boilers using a number of different factors including price installed, manufacturer guarantees, energy efficiency, likely running costs, and more.

£2,400 is the amount you should budget to have this particular boiler installed on a straightforward installation.

To get a free quote for the installation of the Keston Combi 35 boiler in your home, simply enter your postcode in the box provided on this page. You can also find out whether this is the right boiler for your home by clicking to email our installation team or by calling us on 01604 343053.


Installed price guideline
£2,400

Get your free quote

Keston Combi 35 Gas Combi boiler specifications

Powered by GasGas
LocationExternal
Efficiency rating89.6%
P/L Warranty5 Years
Output in kW35 kW
Height700 mm
Width395 mm
Depth278 mm
MountingWall
Flow rate15 L/m
ERP HeatA
ERP WaterA

Keston Combi 35 Combi Gas boiler frequently asked questions

Is the Keston Combi 35 boiler a standard, combi or system model?

The Keston Combi 35 is a combi boiler you may wish to consider if you want this type of boiler for your house or flat.

Traditional boilers need one or more large tanks to work - one to heat and keep water warm for immediate use and the other to store water intended for heating later. Finding space for these large tanks is difficult in British residential property - remember that our houses and flats are among the smallest in the world. This is the problem that combi boilers were designed to solve when they were introduced in the 1970s.

Combi boilers don't need a tank - instead, they instantly heat water drawn from the mains using technology inside the boiler. This hot water is then distributed immediately to your taps or radiators on demand.

The biggest disadvantage to combi boilers is that they have a maximum capacity for heating water, meaning that they work best when only one point within a household wants hot water. For example, if someone is taking a shower and another person uses a hot water tap at the same time, the water pressure, volume and temperature to both points drops.

Is a Keston Combi 35 combi boiler appropriate for my house or apartment?

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

The output rate tells you how much energy your boiler has to use to provide you and your family with hot water and central heating. A higher output rate means that it can heat greater volumes of water.

Please be aware, though - if you choose a boiler whose output is too low, the water in your radiators and coming from your taps may not be warm enough. Conversely, if you choose a boiler with too high an output, you'll pay more for gas than is necessary.

The Keston Combi 35 combi boiler has an output level of 35 kW, so which types of property would it be appropriate for?

An experienced PlumbProud Gas Safe boiler installer would almost certainly recommend that this Keston Combi 35 Combi boiler would be most suitable for larger properties including detached homes with 15 or more radiators and two or more bathrooms.

With all combi boilers, the "flow rate" (measured in litres per minute) is as important a consideration as output rate when choosing which model to go for. This Keston Combi 35 Combi boiler's flow rate is 15 L/m.

Like all combi boilers, the Keston Combi 35 draws water from the mains. It instantly heats that water and then distributes it to the parts of your home which need it - taps, radiators, bathrooms, and so on.

However, the water in the mains pipe that feeds your boilers has its own flow rate - normally between 10 and 12l/m. So if you choose a combi with a flow rate of 14l/m but local water pressure is equivalent to 11l/m, your boiler will actually operate at 11l/m - below its capacity.

In addition, if different family members want hot water at the same time (like for regular morning and evening showers) and your boiler has to provide hot water to your radiators at the same time, a combi boiler may not be suitable.

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 dimensions does a Keston Combi 35 have?

The Keston Combi 35 measures 700 mm high and 395 mm wide by a depth of 278 mm.

Is the Keston Combi 35 a condensing or non-condensing boiler?

Is the Keston Combi 35 combi an energy-efficient boiler?

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.

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.

Would choosing the Keston Combi 35 combi boiler be an environmentally friendly decision? Here's what the figures say.

Under current UK law, all boilers must achieve a minimum energy efficiency level of 92% (a low to good SEDBUK "A" rating). The minimum level was raised from its previous 88% in April 2018.

Energy efficiency scores are intended to inform consumers of the amount of energy used and wasted when a boiler is in normal operation.

The Keston Combi 35 was awarded an efficiency rating of 89.6% with a SEDBUK band rating of "TBC".

The Energy Related Products Directive (ERP) came into force in 2015. This legislation was introduced to encourage manufacturers to create more energy-efficient products and it covers all products that consume energy during their lifetimes, including energy used during production and at the point of disposal.

ERP ratings of "A" for heat and "A" for water were assigned when testing the Keston Combi 35.

If the Keston Combi 35 combi boiler breaks down, am I covered?

The Keston Combi 35 boiler comes with a 5 year warranty for parts and labour.


The top 10 rated Gas Combi boilers

Using the Plumbproud scoring system, the current 10 ten Gas Combi boilers assessed using a number of important variables are as follows:

1Vaillant ecoTEC Plus 82593.35%
2Vaillant ecoTEC Plus 83292.98%
3Worcester Bosch Greenstar 2000 25kW92.89%
4Viessmann Vitodens 050-W 29kW92.66%
5Vaillant ecoTEC Plus 83592.60%
6Worcester Bosch Greenstar CDi Compact 2892.57%
7Vaillant ecoFIT Pure 82592.39%
8Vaillant ecoTEC Plus 83892.16%
9Vaillant ecoTEC Exclusive IQ 83591.90%
10Vaillant ecoTEC Pro 2491.77%
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