Union Gas
A former Ontario natural-gas distribution and storage business whose operations were consolidated into Enbridge Gas Inc.
Last updated August 22, 2026
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Overview
Union Gas was a major Canadian natural-gas company headquartered in Chatham-Kent, Ontario. Its principal business was the distribution of natural gas to customers across northern, southwestern, and eastern Ontario, where its distribution network served approximately 1.5 million customers. The company was therefore primarily a regulated utility and energy-infrastructure business rather than a consumer-products brand. The Union Gas name was associated with the delivery of natural gas to residential, commercial, and other customers in Ontario. Its activities formed part of the province’s broader gas-utility system, alongside network infrastructure and related energy services. The company also historically offered gas-powered water-heater rentals to residential customers. That rental operation was separated from Union Gas in 1999 and placed in a sister company known as Union Energy. Union Gas became part of Enbridge’s corporate structure in February 2017. This followed the merger of its former parent, Spectra Energy, with Enbridge. The transaction brought Union Gas into the Enbridge group while the Union Gas operating identity continued for a period. In a subsequent restructuring, Union Gas Limited and Enbridge Gas Distribution were merged under the corporate name Enbridge Gas Inc. on January 1, 2019. Following the 2019 consolidation, Enbridge progressively reduced use of the Union Gas name in favor of the Enbridge corporate brand. The Union Gas brand is consequently best understood as a legacy identity for an Ontario gas-distribution business rather than as an independent active company. The underlying utility operations continued within Enbridge Gas, while the historical Union Gas name gradually disappeared from customer-facing and corporate usage. The former Union Energy water-heater-rental business also changed ownership after its separation from Union Gas. In 2021, it was acquired by CK Asset Holdings, which took a 75 percent interest, and CK Infrastructure Holdings, which took the remaining 25 percent. The business subsequently became known as Reliance Home Comfort. This transaction was separate from the consolidation of Union Gas’s gas-distribution operations into Enbridge Gas Inc.
History
Union Gas was a major natural-gas company in Ontario, Canada, headquartered in Chatham-Kent. Its core role was the distribution of natural gas across northern, southwestern, and eastern parts of the province. The distribution arm served approximately 1.5 million customers, making the company an important regional gas utility and energy-infrastructure operator. Beyond gas distribution, Union Gas was historically connected with the rental of gas-powered water heaters to residential customers. In 1999, this equipment-rental activity was separated from the gas-distribution business and placed in a sister company called Union Energy. The separation distinguished the regulated utility operation from the consumer equipment-rental activity, although both remained connected through their corporate history. A major change occurred in February 2017, when Spectra Energy, Union Gas’s former parent, merged with Enbridge. Union Gas consequently became a subsidiary of Enbridge. The Union Gas name continued to be used for a period after the transaction, but the business was ultimately integrated with Enbridge’s other Ontario gas-distribution activities. On January 1, 2019, Union Gas Limited and Enbridge Gas Distribution were merged under the corporate name Enbridge Gas Inc. This consolidation ended Union Gas’s existence as a separately named corporate operating business, although its infrastructure and customer-serving activities continued within the Enbridge organization. Enbridge subsequently began phasing out the Union Gas name in favor of its corporate brand. The former Union Energy business later followed a separate ownership path. In 2021, CK Asset Holdings acquired a 75 percent stake and CK Infrastructure Holdings acquired the remaining 25 percent. The operation became known as Reliance Home Comfort. Thus, Union Gas’s historical legacy spans two related but ultimately separate activities: Ontario natural-gas distribution, now associated with Enbridge Gas, and residential water-heater rentals, now associated with Reliance Home Comfort.
- 2021
Former Union Energy business becomes Reliance Home Comfort
[1]CK Asset Holdings and CK Infrastructure Holdings acquired the former Union Energy business, which subsequently operated as Reliance Home Comfort.
- 2019
Operations consolidated as Enbridge Gas Inc.
[1]Union Gas Limited and Enbridge Gas Distribution were merged under the Enbridge Gas Inc. corporate name on January 1.
- 2017
Union Gas enters the Enbridge group
[1]Union Gas became an Enbridge subsidiary after Spectra Energy, its former parent, merged with Enbridge in February.
- 1999
Water-heater-rental activity separated into Union Energy
[1]Union Gas’s residential gas-powered water-heater rental operation was separated into a sister company called Union Energy.
Products and positioning
A regional, regulated natural-gas utility serving Ontario communities, with a large distribution network and a historical ancillary equipment-rental business.
Energy utility
Natural gas distribution
Union Gas’s principal offering was the distribution of natural gas through its Ontario utility network. The business served approximately 1.5 million customers in northern, southwestern, and eastern Ontario. Its activities were centered on supplying gas to customers through regional distribution infrastructure.
Home energy equipment rental
Residential gas-powered water-heater rentals
Union Gas formerly rented gas-powered water heaters to residential customers. This activity was separated from Union Gas in 1999 and transferred to the sister company Union Energy. The business later changed ownership and became associated with Reliance Home Comfort rather than the Union Gas brand.
Brand decisions
2021
Transfer ownership of the former Union Energy businessM&ABackground
The water-heater-rental operation had previously been separated from Union Gas as Union Energy.
Action taken
CK Asset Holdings acquired 75 percent of the business and CK Infrastructure Holdings acquired 25 percent.
Aftermath
The business became known as Reliance Home Comfort and continued separately from Enbridge Gas.
2019
Consolidate Union Gas Limited and Enbridge Gas DistributionM&ABackground
Enbridge owned both Union Gas and Enbridge Gas Distribution after the Spectra Energy merger.
Action taken
The two businesses were merged under the corporate name Enbridge Gas Inc. on January 1, 2019.
Aftermath
Union Gas ceased operating as a separately named corporate business, and Enbridge began gradually replacing the Union Gas identity with its own brand.
2017
Join the Enbridge corporate groupM&ABackground
Union Gas’s former parent, Spectra Energy, merged with Enbridge in February 2017.
Action taken
Union Gas became a subsidiary of Enbridge as a result of the parent-company merger.
Aftermath
The business was later consolidated with Enbridge Gas Distribution under the Enbridge Gas Inc. name.
1999
Separate the water-heater-rental operationStrategyBackground
Union Gas operated both a natural-gas distribution business and a residential gas-powered water-heater rental activity.
Action taken
The water-heater-rental operation was separated into the sister company Union Energy.
Aftermath
The rental business developed separately from the gas-distribution company and later became Reliance Home Comfort.
Sources1 sources
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