Fintube

What Fintube does

Fintube, LLC is a Tulsa, Oklahoma-based manufacturer of industrial heat recovery equipment, founded in 1962 and operating with an estimated 501-1000 employees. The company designs and builds custom-engineered economizers (box, condensing, circular, and in-stack variants), combustion air heaters, process heaters, thermal fluid heaters, convection sections, heat recovery steam generators (HRSG), and waste heat boilers (firetube and watertube). Its product portfolio also includes proprietary branded units EXHAUSTMIZER and THERMOCHARGER, plus Kentube replacement economizers tied to a legacy installed base.

The underlying technology is waste heat recovery via flue gas heat exchange — capturing thermal energy from exhaust streams to preheat water, air, or combustion inputs, with stated capability to push net system efficiency above 90% and deliver customer ROI in roughly 12 months. Fintube's manufacturing processes are stated to be compliant with EPA MACT (Maximum Achievable Control Technology) standards under Section 112 of the Clean Air Act, which is a prerequisite to selling into many regulated industrial sites. The company historically owned and produced the Kentube Engineered Products line; per available data, those assets and manufacturing equipment were divested to E-Tech, Inc. in 2024, with E-Tech now operating as the only authorized Kentube manufacturer.

Fintube's go-to-market is a B2B direct sales motion. Products are custom-engineered to buyer specifications for new facilities or retrofits, pricing is quote-based (no public list pricing), and customer acquisition is driven through a website with a request-a-quote funnel, case studies, brochures, and white papers, supplemented by social channels (LinkedIn, Facebook, Instagram, X) and an ABMA membership trust signal. Target buyers are industrial facilities — across multiple sectors — seeking to reduce energy costs, lower CO2 emissions, and meet regulatory requirements. The firmographic profile indicates the company serves customers both in the United States and internationally.

Name

Fintube

Legal name

Fintube

Website

https://fintubellc.com

Company type

Private

Founded year

1962

Headcount range

501–1,000 employees

Short description

Fintube, LLC is a Tulsa, Oklahoma-based custom manufacturer of industrial heat recovery equipment, including economizers, waste heat boilers, HRSGs, combustion air heaters, and process and thermal fluid heaters, serving regulated industrial facilities in the US and internationally.

Ownership category

akta.pro rank

Product category

Industrial Heat Recovery Equipment

NAICS

Power Boiler and Heat Exchanger Manufacturing (33241)

SIC

Heating Equip, Except Elec & Warm Air; & Plumbing Fixtures (3430), Industrial Process Furnaces & Ovens (3567)

akta.pro primary industry

Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers) (IMAHAEAC)

akta.pro secondary industries

Waste Heat Recovery & Heat Integration (HRSG/ORC, Pinch Analysis, Heat Exchangers) (EUABAJAF), Heat Exchangers & Thermal Transfer Equipment (IMAHAKAC)

Keywords

• Industrial heat recovery
• Waste heat boilers
• Economizers manufacturing
• Combustion air heaters
• Heat recovery steam generators

Headquarters

HQ city

Tulsa

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Distribution channels1 record

Marketing channels4 records

Core offering

Fintube, LLC manufactures and sells heat recovery units to various industries in the United States and internationally. The product portfolio includes economizers (box, condensing, circular, in-stack), combustion air heaters, process heaters, thermal fluid heaters, convection sections, heat recovery steam generators (HRSG), and waste heat boilers (firetube and watertube). The company custom-engineers solutions to capture waste heat from flue gases, increase net efficiency to over 90%, reduce CO2 emissions, and achieve ROI within 12 months for industrial customers.

Product overview

E-Tech manufactures a comprehensive portfolio of waste heat recovery products including multiple economizer types (Box, Condensing, Circular, Economite In-Stack), combustion air heaters, process heaters, thermal fluid heaters, convection sections, heat recovery steam generators (HRSG), and waste heat boilers (Firetube and Watertube). The company also offers proprietary products including EXHAUSTMIZER™ and THERMOCHARGER™. E-Tech serves as the authorized Kentube Engineered Products manufacturer, having acquired the assets and manufacturing equipment for Kentube economizers from Fintube, enabling them to engineer replacement Kentube economizers for legacy installations. Products are custom-engineered to customer specifications for new facilities or retrofits.

Differentiator

Problem solved

Functional benefit

Products and services

• Box Economizers Custom economizer units designed to capture waste heat from flue gases and preheat water or air, suitable for various industrial applications.
• Condensing Economizers Economizers that capture latent heat from water vapor in flue gases, increasing net efficiency to over 90%.
• Circular Economizers Circular-shaped economizer units designed for specific spatial or thermal requirements in industrial settings.
• Economite In-Stack Economizers In-stack economizer designs installed directly within the flue or stack to maximize heat recovery from exhaust gases.
• Combustion Air Heaters Heat recovery units that preheat combustion air using waste heat, improving furnace efficiency and reducing fuel consumption.
• Process Heaters Industrial heating equipment that transfers heat to process fluids or materials for manufacturing operations.
• Thermal Fluid Heaters Heating systems that use thermal fluid to transfer heat to industrial processes without boiling or pressurization.
• Convection Sections Heat transfer units utilizing convection principles to extract thermal energy from gas streams for preheating applications.
• Heat Recovery Steam Generators (HRSG) Systems that recover waste heat from exhaust gases to generate steam for industrial processes or power generation.
• Firetube Waste Heat Boilers Waste heat recovery boilers with firetube construction, designed to convert exhaust heat into usable steam or hot water.
• Watertube Waste Heat Boilers Waste heat recovery boilers with watertube construction, suitable for high-pressure and high-capacity steam generation applications.
• EXHAUSTMIZER™ A proprietary waste heat recovery product that extracts thermal energy from exhaust streams to improve system efficiency.
• THERMOCHARGER™ A proprietary heat recovery unit that charges thermal energy from waste heat sources for industrial applications.
• Kentube Replacement Economizers Replacement economizers engineered to replace legacy Kentube Engineered Products equipment; the Kentube assets and manufacturing equipment were acquired from Fintube, enabling custom-engineered replacement units of any size and type for legacy installations.

Quantifiable outcome

• Increase net efficiency to over 90%
• +2 more outcomes

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• FintubecoreOthers · 1 January 2024E-Tech acquired the assets and manufacturing equipment for Kentube Engineered Products economizers from Fintube. This acquisition established E-Tech as the only authorized Kentube Engineered Products manufacturer.

Recent moves2 records

Expansion highlights2 records

Direct peers

• API Heat Transfer: API Heat Transfer is a manufacturer of heat exchangers and thermal management products for industrial applications, comparable to Fintube's heat transfer and economizer business.
• Cleaver-Brooks: Cleaver-Brooks is a major US manufacturer of industrial boilers, economizers, and heat recovery equipment, directly competing with Fintube in waste heat recovery and boiler-related products for industrial customers.
• Hurst Boiler & Welding Co. Hurst Boiler manufactures industrial boilers, heat recovery systems, and related thermal equipment for industrial and commercial customers, directly overlapping with Fintube's core offering.
• Victory Energy Operations: Victory Energy designs and manufactures industrial watertube and firetube boilers, heat recovery steam generators, and related thermal equipment, directly competing with Fintube's HRSG and waste heat boiler products.
• Rentech Boiler Systems: Rentech Boiler Systems manufactures industrial boilers and heat recovery equipment with custom-engineered designs, serving similar industrial end markets as Fintube's waste heat recovery business.
• Superior Boiler Works: Superior Boiler Works manufactures industrial and commercial boilers and heat transfer equipment, with comparable custom-engineered offerings serving similar industrial end markets as Fintube.

Broad incumbents

• Watlow: Watlow designs and manufactures industrial heaters, thermal systems, and process heating solutions, comparable to Fintube's process heaters and thermal fluid heater product lines.
• SPX Heat Transfer (SPX Technologies): SPX Heat Transfer is a division of SPX Technologies that manufactures heat exchangers, air-cooled heat exchangers, and related thermal equipment for industrial applications, overlapping with Fintube's heat transfer equipment lines.
• Babcock & Wilcox Enterprises: Babcock & Wilcox is a large industrial boiler and heat transfer equipment manufacturer with a broad portfolio including HRSG, waste heat boilers, and process heat solutions, comparable to Fintube's product scope but at a much larger scale.

Regional players

• Chromalox: Chromalox manufactures electric and immersion process heaters and heat transfer solutions for industrial applications, with comparable process heating and thermal transfer offerings to Fintube, though more focused on electric heating.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/fintube-llc

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Fintube