Vokera Launch New High Power Boiler – Linea One

Linea One Combi BoilerVokèra has announced the launch of the new Linea One, a SEDBUK A rated combi boiler, with high output of 38kW and excellent domestic hot water performance of 15.6 litres per minute.

Linea One is our flagship combi boiler, boasting an array of exceptional features, benefits and efficiency for maximum end user comfort as well as offering a 5 year parts and labour guarantee as standard for total peace of mind.

The Linea One has one of the lowest NOx emissions in its class, with just 29mg/kWh and has an outside weather sensor included in the box, enabling it to be up to 93% efficient*

Alister Maclachlan, technical director, for Vokèra, said:  “We’re really excited about the new Linea One, as we believe it offers customers a high quality, high performance, modern boiler which features some of the latest technology in energy efficiency.”

A snapshot of Linea One’s functions:

Intelligent ‘Pre Heat Memory’ function

The Linea One incorporates an intelligent domestic hot water ‘Pre Heat Memory’ function that, when selected, adapts the appliance pre-heat function to match your typical daily hot water usage pattern. Over a 1-week period, the boiler monitors at what times and how much hot water your household uses, thereafter the pre-heat function of the boiler is automatically adapted to suit your lifestyle, ensuring that there is always an immediate supply of hot water when you need it.

‘Comfort’ function

The ‘Comfort’ function allows you to set a fixed outlet temperature for DHW within the range 35°C to 45°C (factory set at 40°C).  By choosing to operate this function you ensure that your DHW is of a comfortable and safe temperature which is especially useful if there are young children or elderly relatives in the home.

To find out more email marketing@vokera.co.uk

*Based on SAP 2009

Common winter boiler enquiries


During recent winters the UK has experienced prolonged spells of extremely cold weather – down to minus 20oC and below in many areas. This resulted in a significant increase in the number of calls to boiler manufacturers and heating engineers from householders with condensing (high efficiency) boilers where the condensate drainage pipe had frozen and become blocked with ice, causing the boiler to shut down. In the vast majority of cases such problems occur where the condensate drainage pipe is located externally to the building for some part of its length.

British Standards, Building Regulations and boiler manufacturers’ installation instructions currently allow condensate drainage pipes to be located either internally or externally, or a combination of these. These documents give guidance on how to install the condensate drainage pipes in order to reduce the possibility of freezing. However this guidance may not be sufficient to prevent freezing in extreme conditions of the type recently experienced in the UK – with widespread and prolonged very low temperatures.

Note 1This document gives guidance for householders on what to do if a boiler condensate drainage pipe has frozenprovided they feel competent to take the actions described. If you do not feel competent to follow this guidance then you should contact your local Gas Safe registered engineer, explain the situation and arrange for them to resolve the problem. They will also be able to advise on ways to reduce the likelihood of freezing in future. Registered gas engineers in your area can be found using the postcode search facility on the Gas Safe Register website at www.gassaferegister.co.uk

There are a number of measures, detailed below, which householders can take in order to thaw a frozen condensate drainage pipe, free the blockage and re-start the boiler themselves  provided they feel competent to do so (see Note 1)

1. Confirm that a frozen condensate drain pipe is the cause of shutdown.

It is important to confirm that a frozen condensate drainage pipe is the likely cause of the problem before taking any of the remedial actions suggested below. The condensate drainage pipe is a plastic pipe (grey in colour) connected to the bottom of your boiler.

If the following circumstances apply then it is probable that a frozen condensate drainage pipe is the cause –

  • outside temperatures have been below freezing for some time.
  • the condensate drainage pipe runs through the wall and outside the property for part of its length, without any increased pipe diameter, any insulation on it, or other measures to prevent freezing. There may also be a problem if the pipe runs through an enclosed but unheated area, such as a garage or loft.
  • the boiler has previously been working satisfactorily.

Shutdown due to freezing and blockage of the condensate drainage pipe will usually be indicated by a “fault code” on the boiler’s digital display, although this may not specifically indicate freezing as the fault. Indication may also be given by some other alarm such as a flashing light, or by a symptom such as “gurgling” noises coming from the boiler.

Note 2 – please refer to the boiler manual for guidance on fault codes/alarms and their meaning – call us if you are unsure.

2. Locate the blockage.

It is likely that the pipe is frozen at the most exposed point external to the building or where there is some obstruction to flow. This could be at the open end of the pipe, at a bend or elbow, or where there is a dip in the pipe in which condensate can collect. The location of the blockage should be identified as closely as possible before taking further action.

3. Thaw the frozen pipe.

The pipe can be thawed by applying a hot water bottle, a microwaveable heating pack (the sort used for muscular aches and pains) or cloths soaked in warm water to the exterior of the pipe, close to the likely point of blockage. Warm water can also be poured onto the pipe from a watering can or similar container. Do not use boiling water.

Note 3: You should not attempt to thaw a condensate drain pipe if you cannot easily reach it from ground level. Be aware that any water used can quickly freeze if it falls onto pathways – causing a possible slip hazard.

4. Reset/re-start the boiler.

Once the blockage has been thawed and cleared, consult the your boiler manual (if you do not have a copy you can download it from our website by clicking here) for guidance on any action needed to “reset” the fault code/alarm and re-start the boiler.

In most cases, once the condensate drain pipe is cleared and a reset has been carried out, the boiler will re-ignite using an automatic operating sequence.

If this reset/restart does not succeed you should call in a competent engineer to assess the situation and take further action if required. Registered gas engineers in your area can be found using the postcode search facility on the Gas Safe Register website at www.gassaferegister.co.uk

5. Temporary remedial actions:

If the pipe is successfully thawed and the boiler can be re-started then the following temporary remedial actions may help prevent re-freezing if the severe weather continues.

(a) If the external pipe is not insulated as recommended, you should try to rectify this by attaching suitable water-proof and weather-proof insulation over the outside of the pipe to prevent re-freezing. “Class O” pipe insulation is suitable for external use and should be available from DIY outlets and plumbing/heating suppliers.

(b) During the cold spell it may help to temporarily run the heating system with the boiler thermostat (as distinct from the room thermostat) set to maximum. Turn back to the normal setting used once the cold spell is over.

(c) It may also help to temporarily set the central heating timer/programmer to “continuous” (24hr) mode, setting the room thermostat overnight to around 15oC. Again, return to the normal settings once the cold spell is over.

6. Longer term actions:

As previously stated, British Standards, Building Regulations etc. currently allow condensate drainage pipes to run either internally or externally, or a combination of these. These documents give recommendations on how to run the pipe and use insulation, if required,  in order to reduce the possibility of freezing, This guidance was based on prevailing UK winter conditions, however it may not be sufficient to prevent freezing in extreme conditions of the type experienced over recent years.

Should you wish to take action in order to reduce the risk of freezing in future, either by relocating the condensate drainage pipe or by taking other measures, then more detailed guidance is available from your heating installer, service engineer, or on-line here

7. FAQs

What is condensate and what does the condensate drain do?

High efficiency (condensing) boilers remove more heat from the combustion gases, resulting in additional water vapour which is collected within the boiler as condensate, and taken to a suitable drain via the condensate drainage pipe.

Why has my condensate drain only frozen recently?

Recently the UK has suffered from unusually cold weather, over prolonged periods. Existing recommendations for condensate pipe installation, such as pipe insulation, were based on prevailing UK weather conditions and may not be sufficient in the extreme conditions recently experienced across much of the UK.

Shouldn’t my condensate drainage pipe have been installed correctly in the first place?

British Standards, Building Regulations etc. currently allow condensate drainage pipes to be run internally, externally or a combination of these. These documents give recommendations on how to run the pipe and use insulation in order to reduce the possibility of freezing. This guidance was based on the UK winter conditions prevailing until very recently, however it may not have been sufficient to prevent freezing in extreme weather conditions.

Can I improve the pipe installation to prevent freezing?

It would be advisable to examine the condensate drainage pipework and upgrade the installation if required, in order to reduce the risk of freezing in future. This should be done by a competent person and in accordance with relevant British Standards and industry guidance.

A heating engineer cut the condensate pipe to get my boiler working and left the pipe discharging to a bucket as an “emergency measure”. Is this acceptable?

It is recognised that in some instances (e.g. where an elderly person’s heating needs to be reinstated as an emergency measure) frozen condensate drainage pipes may have been cut in order to bypass the blockage. This has been done to allow re-ignition of the boiler, with condensate being collected in a suitable container as a temporary solution.

While not unsafe, this is not recommended practice and if such action has been taken then the condensate drainage pipe must be reinstated as soon as possible, using the appropriate industry guidance (see above) to reduce risk of freezing in future.

Vokèra’s smallest condensing boiler: Compact A

New Vokera Compact AVokèra’s smallest condensing combi boiler the Compact A, has been specifically designed to meet the new Part L of the Building Regulations.

Following the success of Vokèra’s Compact HE range, the new Compact A is a cost effective combi, offering low NOx and is available in two outputs of 25kW and 29kW.

The name Compact describes the boiler perfectly as it is 40 per cent smaller and 22 per cent lighter than the previous model, while the standard Vokèra layout enables quick and easy equipment replacement or upgrade if required.

Alister Maclachlan, technical director, for Vokèra, said:  “We’re really excited about the Compact A, as we believe it offers installers a quality, modern boiler which meets all latest legislation requirements, but at a cost effective price for domestic customers.

“The exclusion of Band B boilers from Part L of the Building Regulations, which came into force in October 2010, means the Compact A is the perfect choice as a cost conscious solution that satisfies the legislative change and meet the needs of installers and customers alike.”

Compact A offers a number of key benefits including pre-mix combustion and a combined parallel and in-series hydraulic circuit.  The expansion vessel is side-mounted and a cyclonic separator is fitted as standard.  The interface is simple to use and a clock kit and wireless programme kit are available as additional options.

To find out more click here

Compact A

Vokèra Compact A combi boiler

Outputs (kW): 25 – 29

Manufactured with you in mind, the Compact A has very small dimensions and is lightweight. The Compact A can fit in a kitchen cupboard with dimensions of 715mm (H) x 405mm (W) x 248mm (D) and is simple to install and commission.


  • ErP Class A
  • Up to 97% efficient (ErP space heating) when installed with optional Vokèra intelligent controls
  • Rear flue option
  • Kitchen cupboard fit
  • Lightweight from just 26kg
  • Tyco connection to RF 7 day programmable room thermostat
  • 5 year warranty

Information Downloads

Click here to view all Vokèra literature.

Compact A

Vokèra Compact A Combi Boiler

The Compact A is Vokèra’s entry level condensing combi boiler which is simple and easy to operate. The Compact A can fit neatly within most standard kitchen cupboards and it has very small dimensions of 715mm (H) x 405mm (W) x 248mm (D).


  •  ErP Class A
  •  Kitchen cupboard fit
  •  5 year parts & labour warranty
  •  Combi boiler for instantaneous heating and hot water
  •  Simple to operate
  •  No need for storage cylinders or tanks

Information Downloads

Click here to view all Vokèra literature.

Further Information & Advice

Mechanical clock and pipe cover are available as optional extras but are not shown.

Upgrade my boiler

two leaves - concept of time passing or old and new lifeIf you have a boiler that needs upgrading, contact us now and we can help make your upgrade hassle free.

Vokera’s boiler upgrade team can answer your queries over the phone or via email on how to go about upgrading your existing gas boiler.

As part of our commitment to maintaining the highest standards, Vokera can also supply you with list of Vokera Approved Installers to contact to ensure you not only get a quality installation, but also at a competitive price, we can also arrange for a Vokera Approved installer to contact you.  All Vokera Approved installers undergo a set of stringent checks including:

  • Have up to date gas safe registration with the Gas Safe Register
  • Are members of, or follow the Benchmark code of practice for quality installation
  • Have attended Vokera training within the last 18 months
  • Have been trading for at least one year
  • Have public liability insurance
  • Have a health and safety policy where applicable
  • And have agreed to the Vokera Code of Practice. Available upon request.
  • We work closely with our Approved installers to ensure that you get a hassle free service every step of the way.

If you have a boiler that you’d like to upgrade, or would like a new system installed, then contact us now at:

boilerupgrade@vokera.co.uk or call: 01727 744031 between 9am – 5pm Monday – Friday.

Vokèra makes every effort to ensure that any installation that is carried out by one of its Approved Installers is of the highest standard. We do however recommend that you seek references prior to commencement of any work in your property, as Vokèra can take no responsibility for any issues relating to the installation. In the unlikely event of any installation related issue, please make us aware as we continually monitor the quality of the Approved Installer network.

Vokèra Balcony Boiler for External Installation

Vokèra the UK’s first boiler specifically designed for outside installation on a balcony or mounted on an external wall. Based on it’s leading combi boiler Unica HE, the Unica Balcony HE offers the same excellent quality, reliability and efficiency, but with increased siting flexibility and the benefit of space saving in a home.

The Unica Balcony HE’s IPX5D rating means that Vokèra is the only UK manufacturer to offer an external boiler able to withstand the elements without the need for additional protection. Not only is it ideal for flats and apartments with limited inside space, but the Unica Balcony HE can also help solve a range of flueing and condensate problems.

When a boiler is not located near an external wall, flue clearances can be difficult to achieve, so the Unica Balcony boiler is a perfect solution. In addition, with many properties wishing to update to a condensing boiler, the issue of condensate disposal can cause problems. Installing a boiler to the outside of the property also means that there is no need to inaugurate lengthy soak away pipework, making the installation quick and easy.

Like the Unica HE, the Unica Balcony HE is a condensing boiler, with the potential to reduce running costs by up to 35 per cent when compared to a conventional boiler. The patented aluminium heat exchanger provides excellent thermal transfer and is corrosion resistant, helping to keep the boiler in good condition and reducing the need for costly maintenance work. The built-in frost protection also helps to keep repair work to a minimum, protecting the appliance from damage during cold weather.

The Unica Balcony HE boiler is initially available in 32kW output, with further models to be added to the range later this year. This latest product from Vokera demonstrates the company’s ongoing commitment to investing in its comprehensive heating solutions that help the installer overcome complex installations.

In addition to the Unica HE range, Vokèra has a comprehensive offering of heating solutions to suit domestic applications, incorporating stylish designs and many optional extras as standard, at an affordable price. For further information call Vokera on 0844 391 0999 or visit www.vokera.co.uk.

Benchmark registered installers get more from Vokèra

Leading boiler manufacturer Vokèra is encouraging Benchmark registered installers to join their recommended installer list, offering them the opportunity to gain customer leads.

Vokèra recognise that particularly because of current difficult market conditions, maximising every opportunity to find new customers is important to installers. Linking up with a leading manufacturer like Vokèra can be the key to finding leads. To join the scheme, Vokera prefer installers to be Benchmark registered, and their necessary qualifications must be up-to-date as well being a loyal Vokera affinity member*.

Eleanor Waldron, marketing director at Vokèra, said: “The recommended installers list is a great way to ensure that we are promoting the best standards in the industry. For those installers who sign up, there is the bonus of being given leads which could turn into work for them, offering them the help they might need during these tough times.”

Vokèra actively supports the HHIC Benchmark scheme, which ensures that the installation and servicing of domestic heating and hot water products are carried out to the highest standards by a fully qualified installer. To find out more about Benchmark or to become a member, visit the Heating and Hot water Industry Council (HHIC) website: www.hhic.org.uk .

For further information on Vokèra’s installer scheme, or how to become a member, email marketing@vokera.co.uk.

* Other conditions apply.

Vokèra launches air source heat pump

As part of its commitment to workable, renewable energy solutions, heating manufacturer Vokèra has launched Aria, the company’s first air source heat pump.

Available in three outputs – 6.8kW, 8.3kW and 11kW – Aria is suitable for new build and retrofit applications. The Aria air-to-water heat pump converts ambient heat from the atmosphere into useable energy for heating and hot water, helping homeowners to save money on their fuel bills and reduce their carbon footprint. The heat pump can be effective even when the outside temperature falls below zero, and can still produce heat from conditions as low as minus 15oC.

The Vokèra air source heat pump works by extracting the heat from the outside air, raising it via a compressor, and then transferring it to a plate heat exchanger. The exchanger then provides heat for central heating or underfloor heating, and also hot water if a cylinder is added to the system. Although flexible enough to be used for a range of applications, Aria is best suited to properties with an underfloor heating system, as they require lower flow temperatures.

Able to operate on a single-phase electrical supply, Aria has a Coefficient of Performance (CoP) of up to 1:3.9 – so for every 1kW of electrical energy used, a heat output of 3.9kW is produced, making it very efficient in operation. For additional energy savings, Aria can be used in conjunction with a solar thermal water heating system, such as Vokèra’s Zenith package.

Aria has been designed to be sited outside of a property and, without the need for any extensive installation preparations, the pump is flexible enough to be used in both new build and retrofit applications. For installers, the heat pump is straightforward to install as it incorporates many system components as standard.

As with most renewable technologies, homeowners with an air source heat pump may require a traditional boiler to provide supplementary heat to make up any temperature differentials. This ensures stable and continued end user comfort. Aria is compatible with all Vokèra boilers.

For the end user, the heat pump is very simple to use. In addition to being easy to operate, Aria is also low noise at just 58db when in use.

Robert Lockhart, Vokèra’s renewables project manager, said: “We are really excited about the launch of our Aria air source heat pump. As a flexible renewable solution, it can be used for both hot water and space heating – something many other ‘green’ options are unable to offer. And when combined with solar thermal water heating, an air source heat pump is a very environmentally friendly and practical option for homeowners.”

The introduction of Aria is the natural next step for Vokèra’s growing renewables portfolio. The company launched the Zenith solar thermal package in 2007 and since then has undergone an intensive renewable launch programme, including the addition of evacuated tubes and inset solar panels to the Zenith range, the Neutro wood pellet boiler and now the air source heat pump.

Vokèra offers a comprehensive range of heating solutions to suit most domestic applications, offering stylish designs and many optional extras as standard, at an affordable price. For further information call Vokèra on 0844 391 0999 or visit www.vokera.co.uk.



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Vokèra Ltd
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