World Heat Wishes You A Happy New Year!

World Heat are welcoming in the New Year and reflecting on 2018!

2018 was the year of change and growth here at World Heat. We started the year by increasing our manufacturing capabilities by bringing in several new large pieces of machinery such as high capacity rollers, a new fork lift truck and 3 new 1 tonne cranes to be used in our new commercial bays, in addition to new welding sets and rolls. The first quarter also saw the development of a new test bay which allowed us to hydraulically test larger and more bespoke units. All of these additions to the site meant that we could increase our manufacturing capacity and offer a wider, more varied product range to our growing customer base.

Expansions were also made with regards to staff as we employed both within our offices and shop-floor throughout the year, with a big focus on strengthening our existing workforce by bringing in additional skills and knowledge from other sectors of the industry. Training has continued to play a big part in our ethos by providing company wide training as well as providing external training to customers and installers.

We hope 2019 will be an even more successful year as we build on the investments made in 2018 and continue to introduce, refine and improve our new and existing product range.

Our offices and factory are now open for the new year and are happy to take any enquiries you may have for both domestic and commercial applications. Please give us a call on 0161 343 8610 or drop us an email at sales@whcylinders.co.uk 


We would like to take this opportunity to thank both our customers and suppliers for your business and co-operation in 2018. We hope we can continue to build on our existing relationships this coming year!


World Heat Welcome Graduate Ramtin to Our Team

World Heat are pleased to introduce you to our newest member of staff!

Ramtin Sedghi has joined our growing team of staff here at our Dukinfield Manufacturing Site. Ramtin graduated from the University of Liverpool with an MSc in Mechanical Engineering in 2017, undertaking Modules such as Structural Materials, Thermodynamics, Fluid Mechanics in addition to specific design modules which covered a variety of engineering software packages including MATLAB. His final year BEng project “Development of a Driving Simulation” earned him a First Class mark.

Ramtin will be working closely with our technical and sales teams, as Graduate Technical Sales Engineer, to build upon the existing knowledge and skill-sets.

Ramtin writes “I chose to take the position here at World Heat as I thought I could make a real impact within a growing company, whilst also learning about the industry first-hand and developing my own skills. I believe my experience with the hospitality industry, will come in use when dealing with customer queries, and technical sales felt like a great fit”.

We’re sure you will join us in wishing Ramtin the best of luck here at World Heat and look forward to working with him.


Innov100 Stamp

World Heat recognised in Innovation 100: Greater Manchester

A hundred of Greater Manchester’s most innovative businesses have been recognised with the publication of the first Innovation 100 Report.

BQ and the Business Growth Hub have teamed together to launch the Innovation 100 which aims to showcase 100 of Greater Manchester’s most innovative businesses and support innovation amongst the region’s small and medium sized businesses.

World Heat are honoured to be included in the listings and view it as recognition for our continued efforts towards designing more efficient equipment, increasing our product range offering and for the development of more efficient manufacturing processes.

We believe our ability to innovate and continually develop/change, has allowed us to grow and expand as a business providing more opportunities in the local area and extending our reach within the market, both technically and geographically.

The full report can be found at: www.issuu.com/room501/docs/_innov100_lr


Corrosion Roles

TechTalk 1: Corrosion of Cylinders

We kick off our new TechTalk Series with the topic “Corrosion of Cylinders” and make you aware of our “Technical Literature” section here on our website.

Improper selection of material is one of the leading causes of failure in pressure vessels. It is important that you check the material suitability prior to order.

Types of Corrosion

Pitting is a localized form of corrosion in which cavities develop in the cylinder shell and by nature is much more difficult to detect. Pitting corrosion is most commonly found in stagnant vessels, as the water chemistry changes and causes a breakdown of the passive film. High concentrations of chloride can also cause pitting.

Stress Corrosion Cracking is caused by a combination of tensile stress and a corrosive environment. It is a very dangerous form of corrosion as most of the surface remains un-attacked but fine cracks can form causing disastrous failure to occur unexpectedly.

Galvanic Corrosion is a result of the coupling of dissimilar metals together in an electrolyte. When connected, a current will flow from one metal (the anode) to the other (the cathode). The anode will corrode, whilst the cathode will be protected.

Corrosion Roles

Causes of Corrosion

Dissimilar Metals cause galvanic corrosion, therefore pipes, joints and fittings of dissimilar metals should not be connected within a system unless precautions are taken to prevent corrosion, such as the installation of dielectric separators.

Hard Water is high in dissolved mineral such as calcium and magnesium. When hard water is heated, lime scale can form. Hard water areas which generally have >280ppm have a high electrical conductivity and are therefore prone to galvanic corrosion.

Soft Water which has particularly low levels of CaCO3, often has a low pH-value and buffering capacity so can be very corrosive to metals.

High Chemical/Mineral/Bacterial Concentrations in the water supply can cause corrosive environments within the cylinder, which in combination with heat and pressure can cause Stress Corrosion Cracking.

Erosion Corrosion caused by turbulent flow due to excessive flow rates

Water Testing

Knowledge of the chemistry of the water supply at the site where the cylinder is to be installed is essential in order to determine whether or not the selected cylinder material will be suitable and whether water treatment should be considered. Factors that are important include; mineral content, dissolved gases (such as Oxygen, Carbon Dioxide and Hydrogen Sulfide), pH-value, hardness (in terms of CaCO3) and pH-level.

Manufacturing Processes

Welding of Stainless Steel is an aggressive process which, if not carried out correctly can greatly reduce the corrosion resistance of the material. World Heat uses a process called purging during the manufacture of stainless steel cylinders to limit oxidation. All of our domestic cylinders are then pickled internally, in order to allow the formation of the passive corrosion resistant layer. Copper cylinders are manufactured through the use of brazing or weld seaming using phosphorous wire. The inclusion of phosphorous means the base metal is not melted resulting in seams with a more consistent corrosion resistance.

Material Options

Contrary to popular belief all materials corrode, selection should be based on the rate at which it corrodes according to the vessels contents. When selecting a material it is also important to consider the following;

  • Temperature and Pressure
  • Water Properties (aggregate state, hardness, pH-value etc.)
  • Further Conditions (start, shut-down etc.)

Stainless Steel grades 304 and 316 tanks may be at risk from Stress Corrosion Cracking (SCC) due to high Chloride levels in the water supply. An alternative to austenitic is Duplex Stainless Steel, its inherent low nickel levels make it more resistant to SCC.

Copper is less prone to rust and attack by chlorides, when problems do occur it is generally in low-use pipe work where stagnation can occur. High Ammonia/Manganese levels within the water supply will also increase the susceptibility of copper and brass to stress corrosion cracking and pitting.

Galvanized Steel cylinders are constructed from Carbon Steel to give the cylinder its strength and then hot-dip galvanized to prevent corrosion and make it suitable for use with potable water. All galvanized cylinders are supplied with a sacrificial anode as standard.


Sacrificial Anodes use the principles of galvanic corrosion and ‘sacrifices’ itself for the protection of the cylinder. The corrosive material attacks the anode (the more easily corroded material), while the cylinder shell acts as the cathode. In soft water conditions, the low electrical conductivity of the water may reduce the electrical flow between the two metals, thereby stopping the anode from corroding and leaving the cylinder shell unprotected. In larger pressure vessels, sacrificial anodes are also not very efficient because of the large surface area of the cylinder.

Powered Anodes are therefore an option in both larger cylinders and soft water applications. Powered anodes are non-sacrificial, titanium anodes which, theoretically, should last the lifetime of the cylinder. They are connected to an external DC power source, which allows for a greater potential between the anode and cathode. In extremely soft water areas, powered anodes may also have no effect as the conductivity of the water may still be too low.

For domestic applications, World Heat strongly recommends powered anodes complete with indicator light to indicate the protection status. Sacrificial anodes require regular maintenance and will corrode at different rates depending on location.

Special Considerations for Commercial Vessels

Before large commercial vessels are used, it is important that they are thoroughly cleaned and flushed to remove any traces of manufacturing debris from both the vessel and system. Please contact a flushing specialist for further information. The vessel internals should be regularly inspected as part of a maintenance plan to check for any evidence of corrosion. Inspection openings are offered for this reason. During periods of downtime it is important that the water within the vessel is left to stagnate, thereby increasing the probability of corrosion. To avoid corrosion during these periods a number of options can be taken;

  • Fill system with an inert gas (i.e. nitrogen)
  • Fill and continuously circulate de-mineralized deoxygenated water


O’Brien et al (2014) A comparative performance analysis of Copper and Stainless Steel indirect hot water storage cylinders.

Reinhart, M (1975) Design for Corrosion Control of Potable Water Systems


www.pressurevesseltech.asmedigitalcollection.a sme.org



You can download our ‘FACT SHEET 1 – Corrosion of Cylinders’ directly from our website www.whcylinders.co.uk/technical-literature and check out any additional technical information you may require.



New TechTalk Series

Next month will see the introduction of our new TechTalk series here on our website.

At World Heat we pride ourselves in providing our customers with all of the knowledge and skills that they need to correctly specify and install our range of products. As part of our Technical Training service we will now be providing an online TechTalk series over on our website www.whcylinders.co.uk

The series will consist of technical articles throughout the year, covering topics such as;

  • Legionella Causes and Prevention
  • Building Information Modelling
  • Offsite Manufacture
  • ERP and Eco-Design Directives
  • Renewable Heating
  • And much more!

We hope you enjoy the series and find it informative. If you have any requests or ideas for future TechTalk’s please leave a comment below.

BIM Maturity Scale

BIM Now Available!

World Heat recognises that Building Information Modelling (BIM) is becoming integral within the Building Services Industry. Recent expansions within our design department have meant that we are now able to offer BIM Level 2 to all of our customers. Over the next months we will be continuously improving our libraries and approach to BIM in preparation for the introduction of Level 3.

What is BIM?

Building Information Modelling is a process for creating and managing information on a construction project across the project lifecycle, from initial design to facilities management once the building is in use. BIM objects do not only provide a visualisation of a product but also contains information pertaining to the product properties, its geometry and its functional data.

As part of the Government Construction Strategy (2011), the UK Government set a target for a reduction in the cost of Government Projects by 15-20%. One of the main initiatives set out within the policy was the mandating of BIM on all public sector projects from April 2016, meaning that Government departments must make BIM central to their tender and procurement procedures.

Modelling Software

All of our 3D models and BIM files are produced using Autodesk Inventor 2016. Subsequently, all files will be saved in the 2016 version. (Please Note: Files cannot be reverted to earlier versions)

File Formats Available for BIM Exchange

We are able to offer two main file types suitable for BIM Exchange, including;

ADSK – ADSK is a data exchange format and can be opened in all Autodesk Products (including Inventor and Revit). Unlike an .rfa file the model does not need to be simplified, hence proves to be a more time efficient option.

RFA –    The Revit Family File is stored in the RFA format and is used by Revit. These RFA files are generally classified as data files that contain one or more 3D models that can be imported   into a three dimensional scene. RFA files contain BIM (Building Information Modelling) data and require Autodesk Revit software. To convert an Inventor File into Revit the model must be simplified into base features which Revit can recognise; this simplification process is an additional step.

BIM data will only be provided for (which need to be agreed and confirmed for each project prior to the commencement of work); information & design development and geometric co-ordination.

Information Required from Customer

Customers may provide us with guidance as to:

  • The Level of model Detail required (LOD), relating to graphical detail
  • The Level of Information required (LOI), relating to non-graphical detail
  • The format in which they require the model (ADSK/IFC/RFA)

If this information is unknown, we will provide LOD – 4, LOI – 4 in ADSK Format, as standard.

For further information, please contact us at sales@whcylinders.co.uk

Graham VTC Skid-WWH Logo

Plate Heat Exchanger Packages Heading to Headingly

World Heat Cylinders are proud to reveal our new range of Commercial Plate Heat Exchanger Packages!

The first set to go out of the doors are two bespoke packages for the redevelopment at the Headingly Stadium site. Each package provides 420kW and 1800 Litre of storage to provide instantaneous domestic hot water (DHW) for both the Leeds Rhinos Rugby Stadium and Yorkshire County Cricket Club.

The unit itself consists of a 1,800 litre thermal store buffer vessel, compact brazed plate heat exchanger, control and high limit electrically actuated valves, secondary shunt pump and controls. In addition to the packages, storage calorifiers, unvented kits and immersion heaters have also been provided. Due to restrictions at site, the units were specifically designed with larger diameter storage vessels so that the height could be kept at a minimum and the packages easily handled and positioned at site.

The NeroStore Standard Range of Packages covers 30 – 600kW, with bespoke units being designed outside of this range. World Heat offer flexible configurations which include gasketed/brazed plate heat exchangers, primary/secondary pumps, 2/3/4 Port mechanical and electrical control and packaged/loose unvented kits.

If you have an enquiry or would like more information regarding our standard range of NeroStore’s, please contact us at sales@whcylinders.co.uk


Vent Head

Introducing Our New Range of VH Vent Heads

World Heat Cylinders have recently introduced a new range to our Commercial Products Catalogue!

The VH Range of Vent Heads are designed for use on vertical open-ended steam vent pipes, such as those found on Blowdown Vessels, Boiler Feed Tanks, De-Aearator Heads, Condensate Vessels etc. The Vent Head’s purpose is to remove entrained water from discharge steam in order to safely discharge dry steam to the atmosphere.

Our standard range covers connection sizes from DN50 PN16 to DN300 PN16. We can also manufacture bespoke units by request.

Go to our product page to find out more information or download our Product Information Sheet – Vent Head.


Oil Cooler Heat Exchanger Manufactured

World Heat Cylinders have recently manufactured a replacement oil cooler for use on an oil rig in the Irish Sea.

The heat exchanger needed to be manufactured to match the existing shell exactly as it incorporated a floating header which needed to seal tightly at one end.

The exchanger was over half a meter in diameter and 6 meters long. It was constructed with cupro nickel tubes and tube plates for enhanced corrosion resistance and comprised of over 240 individual tubes.

The heat exchanger was shipped out to the rig at the beginning of June and fited precisely first time which is a glowing credit to our fabricators and engineers and opportunity for us to show just how skilled our workforce actually are.


Extensive Product Range

World Heat Cylinders provide an un-rivalled range of hot water cylinders, calorifiers and buffer vessels. Whatever the capacity, material or connections required World Heat Cylinders can manufacture it