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Welcome to Petra.

Welcome to Petra UK's New Website

The purpose of this website is not only to introduce you to our HVAC systems, though of course we hope that you will want to discuss your Chiller, AHU, CRAC etc. requirements with us, but perhaps equally important to us is our wish that you will engage with us as we bring all that Petra Engineering Co. has to offer to the UK market.

We are at the very early stages of this mission, and we would sincerely welcome your feedback and support as we continue to develop our business and advance the range of products that we will have to offer.

We hope that within these pages you will find interesting and informative articles and news items, and that you will share your ideas and opinions with us.  We will post regularly about our activities in the UK and Europe as well as bring you news about product developments, not only by Petra Engineering, but also from other manufacturers across the globe.

Everyone at Petra, both in the UK, Europe and Jordan, is absolutely committed to succeeding in this venture and we invite you to check into this website from time to time, read our News and Knowledgebase articles (or subscribe to be notified when a new item is published), and let us know what you think.

There are many well known and well established chiller and HVAC manufacturers in the industry today, but our goal is to offer our clients a service that is more personal, more collaborative and gives outstanding value.

Petra UK Team

Engineering Excellence

Petra have been designing and manufacturing HVAC systems for more than 30 years.  Our success is built on a solid understanding of engineering and a commitment to building quality products that are robust, reliable and efficient.

The components that are used in each unit are carefully selected for every application.  This is what makes the difference.  Our philosophy is that as buyers and specifiers of chillers and other HVAC systems, knowing what the options are and how they function together is important for our clients, and enables us to collaboratively create the best solution for every application.


Petra UK - Refrigerants


The refrigerants that are commonly used in refrigeration and air conditioning have changed over recent years, and are still changing, as the drive for greater efficiency and improved sustainability continues.

Selecting the most appropriate refrigerant is an important choice

Read more here...

Petra Screw Compressor


As with the refrigerant, compressor choice determines many of the characteristics of the unit in which they are installed.

What are the features of each type of compressor and what are factors to consider when deciding on the best solution for your cooling requirements?

Read more here...

Petra Condenser Coils


At Petra we manufacture our own copper/aluminium and copper /copper coils, and offer coating  options for protecting the coils against environmental damage.  

The type of condenser used is an important consideration when deciding on the best chiller for your application

Read more here...

Petra - Plate Heat Exchanger


The evaporator is one of the most important components of a chiller, and its  purpose of is to transfer the cooling energy from cold gas of the refrigerant to the water or other coolant media.

Two of the three commonly used types of evaporators are found within Petra's range of chillers

Read more here...

Petra - EC Fans vs Axial Fans

Condenser Fans

Fans are another significant  component of a chiller, as the efficiency of the fan motor is an important consideration.

Furthermore, fans can contribute to the noise level emitted by the unit and in certain applications this can be a deal breaker

Read more here...

Petra Thermostatic Expansion Device

Expansion Devices

In modern chillers and AC systems, we principally find that two of the four types of expansion device to be most frequently used are the thermostatic expansion valve and the electronic expansion valve.

Details of the function of the device, the differences between the types and the benefits of each can be found here...


The modern day drive for energy savings in buildings has resulted in buildings with small openings and little natural ventilation.  Consequently, energy saving goals and environmental comfort conditions can be in conflict, making an accurate and responsive controls system a vital componenent

Read more here...

Petra Product Selector – Air Cooled Chillers

Petra offers a wide selection of air cooled chillers, ranging from 14kW through to over 2MW in capacity and with multiple options in terms of refrigerant choice, compressor, condenser, evaporator and fan types.  In addition to these options, we can also supply chillers with reduced noise levels, condenser coils with protective coatings, free-cooling solutions and units that can be sited in explosion hazardous environments (ATEX and IECEx).

Our Product Selector allows you to specify exactly the unit that you are interested in and then to request a quotation with just a few clicks.  Once we have your enquiry, we will get back to you quickly with our proposal.

To access the Product Selector for the first time, please click here and just provide us with some basic information so that we know where to send the quote, or answer any questions you might have.  You can change your permissions at any time and we promise never to spam you or share any of your information.

And if you cannot find exactly what you are looking for within our standard range, please just send an enquiry to uksales@petra-ww.com and we will get back to you with a tailored solution.


Petra’s Rooftop Package Units are single packaged units which are factory assembled, tested and shipped fully charged complete with compressor, evaporator and condenser coils, fans and controls.  These packages are designed for outdoor installation, and are used for cooling only or cooling and heat pump application (optional).  PPH units are ideal for residential, commercial and industrial applications and are available from 12 kW  to 645 kW, depending on your choice of refrigerant, compressor etc.

Petra’s PPH series is designed for flexible capacity applications and easy installation and maintenance.  PPH units are compact in design and are supplied in a complete package ready for operation, with no extra controls or additional items for installation. The PPH units have a single power point entry with simple connections.

Our package units can also be supplied as water-cooled systems, or manufactured for explosion hazardous locations.  For more information, please see the Package Unit product page here, or contact us directly at uksales@petra-ww.com.

Latest News and Articles


World Refrigeration Day, 2021

The theme for World Refrigeration Day, 2021 is raising awareness of the people that work inside this hidden industry – the #coolingchampions and the #coolcareers that this industry offers

World Refrigeration Day

Petra is a proud sponsor of World Refrigeration Day which is an opportunity for all of us to come together to learn, share knowledge, build connections and find opportunities to collaborate to improve modern life

The ‘New’ Normal

As we begin to emerge from the lockdown, we think ahead to how we can work more closely with our clients and take the chance to re-confirm our intentions

Coronavirus – Update 4

Latest news from our Head Office in Amman regarding the status of operations at our manufacturing facilities

Transmission and mitigation of the spread of corona viruses

In a departure from our usual message to the industry, in May’s edition of the ACR News we wanted to share some researched information about how to mitigate the spread of viruses in buildings by use of mechanical means


Continuum Mechanics

Continuum mechanics deals with physical properties of e.g. fluids which are independent of any particular coordinate system in which they are observed.

The History of Refrigeration

Our ‘History of Refrigeration’ timeline gives you a brief glimpse into the key milestones of the development of refrigeration and air conditioning

Water-Glycol Mixtures

Coolants are heat transfer media which are intended for use below 0°C. Due to its high specific heat capacity, water is often used even below 0 °C. However, pure water already freezes at 0 °C, i.e. the polar water molecules arrange themselves into ice crystals. Glycol as an additive is an effective solution for this

Petra UK - F-Gas Regulations Post Brexit

F-Gas Regulations

As a part of the EU, the UK was subject to the terms and conditions of legislation governing the emissions and supply of fluorinated greenhouse gases in Europe. With effect from 1st January 2021 however, these regulations will no longer apply in Great Britain and will be replaced.

Petra - EC Fans vs Axial Fans

EC Fans vs. Axial Fans

In HVAC applications, fans are second only to compressors in consuming power. Here we look at two types of fan motor that have a direct effect on the overall efficiency of a chiller or air handling unit

Petra – What we’ve achieved so far

Years in Business

Offices Worldwide



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