6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OFFOREIGN PRIVATE ISSUER

Pursuant to Section 13a-16 or15d-16 of the

Securities Exchange Act of 1934

For the month of February 2024

Commission File Number: 001-41531

Enerflex Ltd.

(Exactname of registrant as specified in its charter)

Suite 904,1331 Macleod Trail S.E.

Calgary, Alberta, Canada, T2G 0K3

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ☐   Form 40-F ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1). ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

SIGNATURE

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

EX-99.1

Exhibit 99.1

ENERFLEX LTD. APPOINTS PREET DHINDSA AS

SENIOR VICE PRESIDENT AND CHIEF FINANCIAL OFFICER

NEWS RELEASE

CALGARY, Alberta, February 15, 2024 – Enerflex Ltd. (TSX: EFX) (NYSE: EFXT) (“Enerflex” or the “Company”) today announced the appointment of Mr. Preet Dhindsa as Senior Vice President and Chief Financial Officer (“CFO”), effective March 1, 2024. Mr. Dhindsa has served as the Company’s Interim CFO since October 13, 2023.

“Preet has provided solid leadership and financial stewardship since joining Enerflex in October, and our company benefits from hisfinancial acumen and experience leading diverse, complex, multi-national businesses, including through post-merger integration activities,” said Marc Rossiter, Enerflex’s President and Chief Executive Officer. “I’m excited towelcome Preet as our CFO at this important time for our company and look forward to his continued leadership of Enerflex’s strong global finance organization as we continue to unlock the benefits of the Exterran acquisition and position ourcompany for long term growth and value creation.”

Mr. Dhindsa is a seasoned financial leader with more than 25 years of experience, primarily in the energy and financial services sectors. Prior to joining Enerflex in October 2023, he served as Executive Vice President and CFO at ENMAX Corporation, a regulated utility with energy generation and retail lines of business, where he was accountable for the finance and information technology functions across operations in both Canada and the United States. Mr. Dhindsa previously served as CFO and Chief Administrative Officer at AMP Energy, a solar energy developer with a global footprint. Prior to that, he was SVP & CFO, Global Banking & Markets at Scotiabank, where he managed international finance teams and critical regulatory relationships in Canada, the United States, Europe, and Asia-Pacific. Mr. Dhindsa began his career as a professional accountant at KPMG. He holds a Bachelor of Science degree in Mathematics & Statistics from Western University and a Graduate Diploma in Accounting from Wilfrid Laurier University. Mr. Dhindsa is a Chartered Professional Accountant and Chartered Director.

“I am pleased to continue my work at Enerflex, which includessupporting the execution of our global strategy, improving the profitability and resiliency of the business, generating sustainable free cash flow, and strengthening our financial position,” said Mr. Dhindsa. “Since joining inOctober, I have been impressed by the Company’s diverse global presence, unique approach in enabling the energy transition, and strength of its culture and team. I am excited to help unlock the business’ full potential for the benefit ofour shareholders, customers, employees, and other stakeholders.”

ABOUT ENERFLEX

Transforming Energy for a Sustainable Future. Enerflex is a premier integrated global provider of energy infrastructure and energy transition solutions, delivering natural gas processing, compression, power generation, refrigeration, cryogenic, and produced water solutions.

Headquartered in Calgary, Alberta, Canada, Enerflex, its subsidiaries, and interests in associates and joint ventures, operate in over 85 locations in: Canada, the United States, Argentina, Bolivia, Brazil, Colombia, Mexico, Peru, the United Kingdom, the Netherlands, the United Arab Emirates, Bahrain, Oman, Egypt, Kuwait, India, Iraq, Nigeria, Pakistan, Saudi Arabia, Australia, Indonesia, and Thailand.

Enerflex’s common shares trade on the Toronto Stock Exchange under the symbol “EFX” and on the New York Stock Exchange under the symbol “EFXT”. For more information about Enerflex, visit www.enerflex.com.

For investor and media enquiries, contact:

Marc Rossiter

President and Chief Executive Officer

E-mail: MRossiter@enerflex.com

Jeff Fetterly

Vice President, Corporate Development and Investor Relations

E-mail: JFetterly@enerflex.com