The long-term UK partner of choice for

bespoke heat exchangers

Sterling TT is a UK heat exchanger designer and manufacturer. Established in 1904, we serve countries around the globe with our high-quality, bespoke heat exchangers.

We deliver our heat exchange solutions across industry sectors such as renewables, power generation, power distribution, oil and gas, defence, marine, recycling and industrial.

What we do

Engineer working in the conceptual design department of Sterling Thermal Technology, designing a heat exchanger

Conceptual design

manufacturing heat exchangers , Sterling Thermal Technology's employee welding


aftermarket engineer removing header in Sterling TT's factory

Aftermarket & Service Support

In-house design

We invest in our design tools and use custom configurator software that helps us find the optimal design for your needs. We have an expert understanding of materials and heat exchanger configurations; and experience across many industries. Therefore, our engineers competently collaborate with you for a bespoke solution.


Our UK manufacturing facilities are cutting edge. With technology developed in-house, such as our Elfin, or Avantair, we push forward performance standards. With the range of unique options available to us, we can find the right balance between efficiency and cost-effectiveness.

Aftermarket and service support 

For tests, inspections, and reports on your heat exchanger, visit our TIR page.

For cleaning, maintenance, repair, upgrade or replacement of your heat exchanger, visit our aftermarket and service support page.

UK-based with a global reach

While we are a UK-based heat exchanger manufacturer, working with us, you’ll benefit from international expertise and experience. We supply equipment to global brands and small businesses globally.

Our products

Air blast cooler

Avantair, air-to-air cooler with heat pipe technology, designed and manufactured by Sterling Thermal Technology


CACA (air-to-air cooler) cooler designed and manufactured by Sterling Thermal Technology for Golden Pass LNG located in Sabine Pass in Texas

CACA cooler

CACW cooler in Sterling Thermal Technology's factory where it was designed and manufactured for a renewable energy application

CACW cooler

Shell and tube heat exchanger designed and manufactured by Sterling Thermal Technology, in the UK factory

Shell and tube

hydrogen coolers for nuclear applications, designed and manufactured by Sterling Thermal Technology

Hydrogen cooler

Steam air heater designed and manufactured by Sterling Thermal Technology

Steam air heater

    Why Sterling TT for heat exchanger supply

    Projects in the last 10 years
    Repeat clients in the last 5 years
    Companies served in the last 10 years

    Talk to us..

    Call us at +44 (0)1296 487171

    Or click here to fill a form

    Sterling TT’s history

    We have been making heat exchangers since 1904. Previously, we were known as HEI, Thermo Engineers and other names, but one thing has been consistent: we have been at the forefront of heat exchanger technology.

    Today, Sterling TT is the preferred heat exchanger supplier in many of our target markets. Our clients include small to large OEM and end-users.

    Find out more on our About Us page

    Designing and manufacturing in the UK

    Our state-of-the-art heat exchanger manufacturing facility is located in Aylesbury, North-West of London.

    We design to standards such as ASME VIII, BS5500, API 12, API 560, TEMA and CODAP, plus to the major manufacturing specifications and rules including NORSOK, BV, DNV, Lloyd’s Register and NKK.

    Our certifications

    We take quality, heath & safety, and environment management seriously. Our manufacturing site in Aylesbury is certified ISO 9001:2015, ISO 45000:2018 and ISO 14001:2014.

    Also, we work with independent, third-party inspectors including Lloyds Register, BSI, DNV (Norway), BV (UK), ABS (US) and NKK (Japan).

    Understanding heat exchangers

    various heat exchangers designed and manufactured by Sterling Thermal Technology based in the UK

    Considerations for designing bespoke heat exchangers

    shell and tube heat exchanger designed and manufactured by Sterling Thermal Technology

    Why choose a shell and tube heat exchanger

    aftermarket engineer removing header at Sterling TT's factory

    Heat exchanger maintenance guide

      Heat Exchanger FAQ 

      Quickly learn what you need to know about heat exchangers.

      What is a heat exchanger?

      A heat exchanger is a device that transfers heat energy from one medium to another. In factories, plants and vehicles, facilitating heat exchange is important to maintain the desired temperatures of the liquids and gases used in those systems. These might be water, oil, chemicals, for example.

      Read more on our blog ‘What is a heat exchanger?

      What are the types of heat exchangers?

      Heat exchangers can be classified in different types such as their design (shell and tube, single tube) or whether a phase change occurs (such as in a condenser). Each type is suited to different purposes and applications. For example, compact fin heat exchangers help to save space through a compact design while still effectively transferring heat – very useful in marine or oil and gas applications.

      To understand how different designs have different pros and cons, read “Types of shell and tube heat exchanger”.

      What is the most common type of heat exchanger?

      The most common and versatile heat exchanger is the shell and tube design. These consist of a number of tubes contained within a cylindrical shell. They can be found in almost every industry, though in some (such as  food and beverage), you are more likely to find single tube designs.

      What is a condenser

      A condenser is a type of heat exchanger, too. Specifically, it is a heat exchange that cools down hot gas past its dew point, condensing it into liquid.

      What are the common problems that occur in heat exchangers?

      When high temperatures or corrosive materials are involved, there is a risk of corrosion and fouling, which can reduce the efficiency of a heat exchanger or cause leaks. However, a good cleaning schedule and routine servicing can avoid these problems.

      Read more in our blog: Heat Exchanger Leaks.