There is persistent confusion in Ontario real estate about whether a hot water tank is a fixture or a chattel, particularly when it is described as “rented.” The confusion does not come from the law. The law is clear. The confusion comes from industry practice drifting away from first principles.
The Law of Fixtures: Medieval, Stable, and Still Binding
Ontario fixture law is not new. It traces back to medieval English common law and was adopted wholesale into Canadian property law. The modern Ontario formulation is found in Stack v. T. Eaton Co., which establishes the governing test:
- Degree of annexation
- Purpose of annexation
Once an object is properly affixed to land for the purpose of improving or completing the building, it ceases to exist as a chattel and becomes part of the real property.
The classic example is a nail driven into a shingle.
The nail was once a chattel.
The shingle was once a chattel.
Once nailed to the roof, neither has an independent legal existence. They are part of the house.
The supplier’s ownership interest is gone. Any remaining rights are purely contractual or statutory (such as a lien). If those rights are not exercised, they are lost. The supplier cannot return and remove the nail or the shingle.
Ontario Court of Appeal Confirmation: City of Mississauga v. GTAA
The Ontario Court of Appeal reaffirmed this principle in City of Mississauga v. Greater Toronto Airports Authority.
The Court confirmed that:
- Improvements affixed to land become part of the land
- Private agreements cannot change the legal effect of annexation
- Property law classification prevails over contractual labels
In other words, parties cannot contract their way out of fixture law as against the land itself or third parties. Once annexation occurs, real estate law, not the contract, governs ownership.
Applying the Law to a Hot Water Tank
A hot water tank, once:
- fully installed,
- plumbed into the water system,
- connected to gas or electricity,
- vented and functioning as part of the home’s utilities,
is annexed to the real property.
Under Stack and Mississauga:
- it is installed for the purpose of completing the house,
- it is intended to function as part of the dwelling,
- it is no different in principle from furnaces, boilers, windows, or roofs.
At that point, the tank loses its status as a chattel and becomes a fixture.
Whether it was once “rented,” “leased,” or supplied under contract does not alter the property law result. Those arrangements may create personal claims between contracting parties. They do not prevent annexation. They do not preserve ownership. They do not stop the tank from passing with the land.
Just like the nail in the shingle.
Liens Are Not Ownership
This distinction matters.
- The Construction Act provides lien rights — not continuing ownership.
- The PPSA provides security interests — not immunity from annexation.
If lien rights expire or are never perfected, the supplier is left with a lawsuit against the contracting party, exactly like Home Depot when a contractor is not paid for materials incorporated into a house.
Home Depot cannot repossess shingles from the roof.
A supplier cannot repossess fixtures from the home.
That is not a loophole. That is the law.
Considerations
Under Ontario law:
- Annexation is decisive
- Fixtures lose independent existence
- Ownership follows the land
- Contracts do not override property law
A properly installed hot water tank is a fixture, not a chattel.
The “nail in the shingle” analogy is not rhetorical, it is doctrinal.
Brian Madigan LL.B., Broker
www.OntarioRealEstateSource.com