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Plumbing & Water Heater Inspection Glossary of Terms and Conditions
ABS plastic pipe - Acrylonitrile butadiene styrene piping commonly used for residential drain, waste, and vent systems.
Abandoned tank - A storage tank no longer in use. An abandoned underground tank may require removal or proper decommissioning to address leakage and environmental risks.
Access - The ability to reach water heaters, supply pipes, waste pipes, and other equipment safely for inspection, operation, and maintenance.
Acrylic - A rigid plastic material commonly used in bathtubs, shower bases, and other plumbing fixtures.
Add-on - Equipment added to an existing system. An add-on heat pump water heater, for example, supplements an existing water-heating arrangement.
Aerator - A faucet attachment that mixes air into the water stream to regulate flow and reduce splashing.
Air admittance valves - One-way valves that admit air into drainage piping to help prevent siphoning of trap seals. They must be installed where permitted and do not discharge sewer gases outdoors.
Air induction system - A system that draws air into water jets, commonly in whirlpool and hydromassage bathtubs, to create bubbles.
Automatic air vent - A device that automatically releases trapped air from a hydronic heating system.
Asbestos cement piping - Older piping made from cement reinforced with asbestos fibres. Disturbing or cutting it can release hazardous fibres.
Baffle - A component that redirects gases or fluids. In a combustion appliance, it may direct hot gases to improve heat transfer.
Backup at floor drain - Wastewater rising or emerging from a floor drain, potentially indicating a blocked drain, overloaded sewer, or other drainage problem.
Barometric damper - A draft-regulating device used on certain combustion appliances to help stabilize chimney draft.
Basin - A bowl-shaped plumbing fixture used to collect water, such as a bathroom sink basin.
Bell and spigot connection - A pipe joint in which the plain end of one pipe fits into an enlarged end of another, usually sealed with a gasket or jointing material.
Bell trap - A drain trap that uses a bell-shaped cover to retain a water seal. Older designs can be difficult to clean and may not comply with current requirements.
Bidet - A plumbing fixture used for personal hygiene, typically installed near a toilet.
Black steel - Steel pipe with a dark surface, commonly used for fuel-gas piping where approved. It must be suitable for the fuel and installation conditions.
Branch vent - A vent pipe connecting one or more individual fixture vents to a larger vent system.
Brass pipe - Pipe made from a copper-zinc alloy. Older brass plumbing components may contain lead or exhibit corrosion, depending on their age and composition.
Building drain - The lowest horizontal drainage piping inside a building that collects wastewater and carries it toward the building sewer.
Building sewer - Piping that carries drainage from the building drain to a public sewer or private sewage disposal system.
Carbon monoxide (CO) - A colourless, odourless, toxic gas produced by incomplete combustion. Fuel-burning appliances must be properly installed and vented, and required carbon monoxide alarms should be present.
Cartridge or ball faucet - A faucet that uses a cartridge or rotating ball mechanism to control water flow and temperature.
Cast iron pipe - Heavy metal piping commonly used for drainage and sewer systems. Older cast iron can corrode, crack, or deteriorate internally.
Caulking - Flexible sealant applied around fixtures, tubs, showers, and other joints to limit water penetration.
Ceramic tile - Fired clay or ceramic surfacing used on floors, walls, and shower enclosures. The complete assembly requires suitable waterproofing; tile and grout alone do not guarantee a watertight installation.
Check valve - A valve that allows flow in one direction and helps prevent reverse flow.
Chimney draft - The pressure difference that moves combustion gases upward through a chimney. Insufficient or excessive draft can interfere with safe appliance operation.
Clogged - Blocked or partially obstructed by debris, grease, mineral deposits, roots, or other material, restricting normal flow.
Clogged pump - A pump whose intake, impeller, or discharge path is obstructed, reducing or preventing water movement.
Cold water sandwich - A brief temperature fluctuation in some tankless water heater systems in which cooler water arrives between periods of hot water delivery.
Combination sewer - A sewer system that carries both sanitary wastewater and stormwater in the same pipe.
Combination systems - Heating arrangements in which one appliance provides both space heating and domestic hot water, or in which water-heating equipment is integrated with another heating system.
Combustible gas analyzer - An instrument used to detect and measure combustible gases in the air, often when investigating suspected gas leaks.
Clearance from combustibles / Clearance to combustibles - The required separation between a combustion appliance, vent, or flue and combustible materials. Insufficient clearance can create a fire hazard.
Combination water-heating system - A system that uses shared equipment to provide domestic hot water and space heating.
Compression faucet - A faucet that controls water flow by pressing a washer against a valve seat. Worn washers or seats can cause dripping.
Concealed union - A union or mechanical pipe joint hidden behind walls, ceilings, or other construction. Concealed joints can make leaks difficult to detect and may be unsuitable in certain installations.
Conventional tank-type water heater - A water heater that stores a quantity of heated water in an insulated tank and reheats it as needed.
Copper pipe - Copper piping used for water supply, drainage in certain applications, heating, and other approved services. It can corrode or leak at joints.
Copper tubing - Copper tubing commonly used for water supply and certain fuel-gas applications where permitted and properly installed.
CPE liner - A waterproof shower-pan liner made from chlorinated polyethylene.
Crown-vented trap - A trap arrangement in which the vent connection is too close to the trap's crown, potentially allowing siphoning and loss of the water seal.
Cross connection - A physical connection between potable water and a source of contamination that could allow contaminated water to enter the drinking-water supply.
Crimped - Bent or compressed so that a pipe or tube opening is restricted, potentially reducing flow or weakening the material.
Delayed ignition - A condition in which fuel accumulates before igniting, potentially causing a loud bang or small explosion. It can damage the appliance and indicates a need for further investigation.
Desuperheaters - Heat exchangers that recover excess heat from a refrigeration or heat-pump system and use it to heat domestic water.
Direct vent systems - Combustion appliances that draw combustion air from outdoors and discharge combustion gases outdoors through a sealed venting arrangement.
Dip tube - A tube inside a conventional storage water heater that directs incoming cold water toward the bottom of the tank, helping maintain separation between incoming cold water and stored hot water.
Discharge tube - The pipe connected to a relief valve that directs discharged hot water toward a suitable termination point.
Domestic water heater - Equipment that heats water for household purposes, including bathing, washing, and cleaning.
Double trapping - A drainage arrangement in which two traps occur in series on the same drainage path. This can impede drainage and trap air between the seals.
Drain pipe - Piping that carries wastewater away from plumbing fixtures toward the building drainage system.
Drain valve - A valve, typically near the bottom of a storage water heater, used to drain the tank for maintenance or servicing.
Drip leg / sediment trap / dirt pocket - A section of fuel-gas piping intended to collect debris or moisture before it enters an appliance. The required configuration depends on applicable requirements and appliance instructions.
Drum trap - A large cylindrical plumbing trap found in some older installations. It can collect debris and may be difficult to clean.
Dual water heaters - Two water heaters installed to serve the same building or system, increasing capacity, providing redundancy, or serving separate loads.
Earthen sump - A sump pit formed directly in soil rather than in a purpose-made basin. It may allow sediment or groundwater to enter and can be less suitable for reliable pump operation.
Electric toilet - A toilet incorporating electrical components, such as a powered flushing mechanism, pump, or electronic bidet functions.
Equal pipe lengths - A piping arrangement in which branches serving parallel water heaters have similar lengths and flow resistance, helping balance flow between the units.
Excess length - A vent connector, pipe, or flexible connection that exceeds an appropriate length for its design, potentially causing flow, support, or performance problems.
Fan-assisted gas water heaters - Gas water heaters that use a powered fan to assist combustion airflow or move exhaust gases through the venting system.
Fan-assisted water heaters - Water heaters that use a fan to assist airflow or combustion-gas removal.
Fan inlet - The opening through which a fan draws air. A blocked inlet can impair combustion or ventilation.
Faucet - A plumbing fixture that controls the release of water from a supply pipe.
Fire safety valve - A valve intended to stop fuel flow under specified fire conditions, where required for the particular fuel system or installation.
Flammable vapour ignition resistant - Describes a water heater designed to reduce the likelihood that flammable vapours near the appliance will ignite.
Flexible connector - A flexible tube or fitting used to connect an appliance to a water, gas, or other supply line. It must be approved for the specific service and installed without damage or strain.
Flexible couplings - Connectors that join pipe sections while accommodating some movement or minor misalignment. Their suitability depends on the pipe material, location, and intended service.
Floor drain - A drain installed at floor level to collect water from spills, leaks, or drainage events.
Floor drain connected to storm sewers - A floor drain that discharges into a storm drainage system rather than a sanitary sewer. This may be restricted or inappropriate depending on local requirements and the type of water discharged.
Forced-draft - A combustion arrangement in which a fan pushes air or combustion gases through an appliance or venting system.
French drain - A gravel-filled trench, usually containing perforated pipe, designed to collect and redirect groundwater away from an area.
Freezing - The formation of ice in water-filled pipes or equipment. Expansion during freezing can crack pipes, damage valves, and rupture plumbing components.
Fuel supplies for gas, oil, and electric water heaters - The utilities and connections needed to operate the appliance: gas or propane piping, oil supply piping, or electrical wiring, as applicable.
Functional drainage - The ability of a plumbing fixture and its drainage system to carry wastewater away at an adequate rate without persistent backup or leakage.
Functional flow - The ability of a plumbing fixture to deliver sufficient water for its intended use under normal operating conditions.
Galvanized steel - Steel coated with zinc to resist corrosion. Older galvanized water-supply pipes can develop internal corrosion and mineral buildup that restricts flow.
Galvanized steel pipe - Galvanized steel piping used in older water-supply systems and other applications where permitted.
Gas meter - A utility device that measures the volume of natural gas or another supplied fuel entering a building.
Gate valve - A valve that opens or closes flow by raising or lowering an internal gate. It is primarily intended for fully open or fully closed operation.
Ground fault circuit interrupter (GFCI) - An electrical safety device that interrupts power when it detects an imbalance in current that may indicate current leaking through an unintended path. GFCI protection is important around certain plumbing fixtures, spas, and wet areas.
Grout - Material used to fill joints between tiles. Cracked or missing grout can allow water to reach underlying materials, although grout is not a substitute for waterproofing.
Gurgling - A bubbling or glugging sound in a drain or plumbing system, potentially indicating restricted drainage, poor venting, or pressure changes.
Heat pump water heaters - Water heaters that extract heat from surrounding air and transfer it to water using a refrigeration cycle. They generally use less electricity than conventional electric-resistance water heaters.
High-efficiency gas water heaters - Gas water heaters designed to extract more useful heat from fuel than conventional models, often using additional heat exchange and specialized venting or condensate drainage.
High-efficiency water heaters - Water heaters designed to deliver more useful heat per unit of energy consumed than less efficient models.
High level alarm - An alarm that activates when liquid in a sump, sewage basin, or tank rises above a specified level, warning of possible pump failure or excessive inflow.
High water table - A condition in which groundwater is close to the ground surface, potentially contributing to basement moisture, sump-pump operation, or groundwater infiltration.
Hose bibb - An exterior or utility faucet designed to connect a garden hose or similar attachment.
Hot tub - A heated pool of water intended for soaking, often equipped with jets and circulation equipment.
Hydromassage bathtub - A bathtub with powered water jets or other equipment that circulates water to provide a massage effect.
Ignition source - A flame, spark, hot surface, or other source capable of igniting combustible gas or vapour.
Ignition system - The components used to ignite fuel in a combustion appliance, such as a pilot assembly, spark igniter, or hot-surface igniter.
Ignition transformer - A component in some oil burners that generates the high voltage needed to create an ignition spark.
Inadequate support - Insufficient hangers, brackets, straps, or other supports for pipes, vents, or equipment, potentially causing sagging, movement, joint stress, or leakage.
Incomplete - A condition in which a required plumbing component, connection, installation step, or protective feature is missing.
Inappropriate material - A pipe, connector, sealant, or other component that is unsuitable for its intended fluid, pressure, temperature, location, or installation requirements.
Ineffective - A system or component that does not reliably perform its intended function, such as a failed trap primer or an ineffective drainage arrangement.
Instantaneous water heaters - Water heaters that heat water as it passes through the unit rather than storing a large volume in a tank. Also called tankless water heaters.
Island venting - A special plumbing vent arrangement used for fixtures located away from walls, such as kitchen islands, where conventional vent routing is difficult.
Laundry tub - A deep utility basin used for washing, soaking, and other household tasks.
Lavatory - A bathroom sink used for washing hands and face.
Lead pipe - Piping made of lead, historically used for water services and plumbing. Lead can contaminate drinking water and presents a significant health concern.
Leakage - The unintended escape of water, wastewater, gas, oil, or another fluid from a pipe, fitting, tank, valve, or appliance.
Loop vent - A venting arrangement that loops upward from a fixture's drainage piping before connecting to the vent system, sometimes used for island fixtures.
Manifold - A common pipe or chamber that distributes or collects fluid from multiple branches or appliances.
Manifolding / Manifolds - Connecting multiple pipes or appliances to a common distribution or collection pipe. In multi-heater systems, the arrangement affects flow balance and performance.
Mechanical damage - Physical damage caused by impact, crushing, abrasion, drilling, or other external forces.
Mixing valve - A valve that combines hot and cold water to deliver water at a controlled temperature.
Motor access - Access to the motor and related components of equipment such as a whirlpool bathtub pump, allowing inspection, maintenance, and repair.
Neoprene liner - A flexible synthetic-rubber waterproofing membrane sometimes used in shower bases and other wet areas.
Nonporous - Having little or no capacity to absorb water through the surface. Nonporous materials are often used where water resistance and easy cleaning are important.
No primer for floor drain - A condition in which a floor drain lacks a device to replenish its trap seal where a primer is required. If the water seal evaporates, sewer gases may enter the building.
Nozzle - In an oil burner, the component that atomizes fuel into a fine spray for combustion.
Orange flame - A flame with a noticeable orange or yellow colour. Depending on the appliance and operating conditions, this may indicate incomplete combustion, contamination, or improper air-fuel adjustment.
Orangeburg piping - Older bituminous fibre sewer pipe made from compressed wood pulp and pitch. It can deform, blister, collapse, or deteriorate with age.
Overflow - An opening or passage intended to prevent a fixture or tank from exceeding a certain water level, such as the overflow opening in a basin or bathtub.
Overfiring - Operating a combustion appliance at a firing rate greater than its rated or permitted input, potentially causing overheating, poor combustion, or equipment damage.
Overloaded - Subjected to a demand exceeding the intended capacity of a pipe, drain, pump, heater, or other component.
Panel - An access cover or enclosure that allows access to equipment for inspection or maintenance. For a hydromassage bathtub, it commonly provides access to the pump and motor.
Parallel systems - Systems in which two or more water heaters or other appliances connect to shared supply and distribution piping so that they can operate together.
Pedestal pump - A sump pump with its motor mounted above the sump pit rather than submerged in the water.
Pervious - Allowing water to pass through a material or surface.
P-trap - A U-shaped plumbing trap with a horizontal outlet that retains water to block sewer gases while allowing wastewater to drain.
Poor floor drain location - A floor drain positioned where it may not collect water effectively, such as away from likely leakage points or where the floor does not slope toward it.
Poor slope - Insufficient or incorrect pipe gradient that can impede drainage, allow standing water or sediment buildup, and contribute to blockages.
Poor support - Inadequate support for pipes, vents, or equipment, potentially resulting in sagging, movement, joint stress, or leakage.
Pressure-assisted toilet - A toilet that uses pressurized air or water to help force water into the bowl during flushing.
Pressure relief valve - A safety valve that releases pressure when it exceeds a specified limit. Water heaters may use a combined temperature/pressure relief valve.
Primary control - The control device that manages burner operation and responds to ignition failure or other specified unsafe conditions.
Private sewer - A sewer line or sewage disposal system that is privately owned or maintained rather than operated by a public authority.
Public sewer - A sewer system operated by a municipality or other public authority that receives wastewater from connected properties.
PVC liner - A waterproof membrane made from polyvinyl chloride, used in some shower-pan and wet-area assemblies.
PVC plastic pipe - Polyvinyl chloride piping commonly used for drainage, venting, water distribution, or other applications depending on its rating and approval.
Pump - A mechanical device that moves water, oil, or another fluid through a piping system.
Puddling oil - Accumulation of unburned heating oil in or around an oil burner or combustion chamber. It can indicate ignition or fuel-delivery problems and create a hazardous delayed-ignition condition.
Recovery rate - The volume of hot water a water heater can produce over a given period while raising incoming water to a specified temperature. It is commonly expressed in litres per hour or gallons per hour.
Recirculating / Circulating hot water systems - Systems that circulate hot water through distribution piping to reduce the wait for hot water at fixtures. They may use a dedicated return line or another approved circulation arrangement.
Refractory - Heat-resistant material lining a combustion chamber to protect surrounding components and withstand high temperatures.
Reset - The action of restoring a tripped or locked-out control to operation after the underlying cause has been addressed. Repeatedly resetting a burner without diagnosing the cause can be unsafe.
Running - Describes water that continues to flow when a fixture or valve should be off, such as a running toilet caused by a leaking flapper or faulty fill valve.
Running trap - A trap installed in a horizontal drain line rather than directly at a fixture. Some designs are obsolete or restricted because they can collect debris and cause drainage problems.
Sacrificial anode - A metal rod, usually made of magnesium or an aluminum alloy, installed in a storage water heater to corrode preferentially and help protect the steel tank from rust.
Self-scouring trap - A trap designed with a shape and flow pattern intended to help carry away solids and reduce sediment accumulation.
Self-trapping - Describes a fixture or drain arrangement that incorporates its own trap or water seal. The specific design must be assessed to ensure it provides an appropriate seal and meets applicable requirements.
Septic tank - An underground tank that receives household wastewater and allows solids to settle and partially decompose before effluent flows to a soil absorption system.
Service piping - Piping that conveys water, gas, oil, or another utility from its supply source to the building or appliance.
Sewage ejector pump - A pump used to lift sewage or wastewater from a basin where gravity drainage to the sewer is not possible.
Shower stall - An enclosed or defined showering area with a floor, walls, and water-control fittings.
Shielded no-hub couplings - Flexible couplings with an external metal shield, used to join compatible no-hub drainage pipes. The shield helps maintain alignment and joint stability.
Short cycling - Repeated starting and stopping of a pump, burner, or other appliance over short intervals. It may indicate incorrect controls, inadequate system capacity, or another malfunction.
Siphon - The movement of liquid through a tube or pipe due to pressure differences and gravity.
Siphoning - The drawing of water out of a plumbing trap due to pressure changes, potentially allowing sewer gases to enter the building.
Single-pass - A system in which water passes through a heating component once rather than being continuously recirculated through it.
Sink - A plumbing fixture with a basin and drain, typically used for washing dishes, food, or hands.
Smoke - Visible particles or gases produced by incomplete combustion. Smoke from an oil burner can indicate improper combustion, inadequate draft, or equipment problems.
Soaker tub - A bathtub designed primarily for soaking, generally without powered water jets.
Soil pipe - Drainage piping that carries discharge containing human waste from toilets and similar fixtures.
Soil stack - A vertical drainage pipe that carries wastewater from toilets and other fixtures through a building.
Spa - A heated water facility, often equipped with jets and circulation equipment, intended for relaxation or hydrotherapy.
Spillage - The escape of combustion gases from an appliance or vent connector into the occupied space instead of being safely carried outdoors.
Split - A crack or separation in a pipe, fitting, tank, or other plumbing component that may cause leakage or failure.
Stack vent - The portion of a soil or waste stack that extends above the highest drainage connection and functions as a vent.
Standpipe - A vertical pipe that receives discharge from a washing machine or other appliance and conveys it to the drainage system.
Storm sewer - A drainage system designed to carry rainwater and surface runoff rather than ordinary household sanitary wastewater.
Submersible pump - A pump designed to operate while submerged in water, commonly used in sump pits and sewage basins.
Suction inlet - The opening through which water enters a pump or circulation system. In a whirlpool bathtub, the inlet should be protected against dangerous suction entrapment.
Superheated water - Water heated above its normal boiling temperature for a given pressure. In a pressurized system, water can remain liquid above 100°C and may flash into steam if the pressure suddenly drops.
Sway bracing - Supports or restraints intended to limit lateral movement of pipes or equipment during vibration, impact, or other movement.
Tail piece - The short pipe connecting a fixture's outlet to a trap or other drainage fitting.
Tankless coils / Tankless coils on boilers - Heat exchangers installed in a boiler that heat domestic water as it flows through the coil, rather than storing domestic hot water in a separate tank.
Tankless water heaters - Water heaters that heat water on demand without storing a large volume in a conventional tank. Also called instantaneous water heaters.
Temperature/pressure relief valve (T&P valve) - A safety device on a storage water heater that opens when water temperature or pressure exceeds its specified limit, helping prevent dangerous tank conditions.
Tempering valve / Tempering valves - Valves that blend hot and cold water to reduce the delivered water temperature and help prevent scalding.
Termination problems - Defects involving the endpoint of a vent, drain, or discharge pipe, such as an unsuitable location, obstruction, or inadequate clearance.
Thermocouple - A temperature-sensing device used in some gas appliances to generate a small electrical signal that helps keep a pilot safety valve open while the pilot flame is present.
Threshold - The raised or defined edge at the entrance to a shower or bathtub area, intended to contain water and separate wet and dry surfaces.
Tile lip - An edge or raised portion of tile that may affect the transition between surfaces or the containment of water.
Toilet - A plumbing fixture designed to receive and dispose of human waste through a drainage system.
Toe tester - A term used for certain foot-operated controls or test devices associated with bathtubs. The precise component should be identified because the term is not universally standardized.
Trap arm - The section of drainage pipe between a fixture trap and its vent connection. Its length, slope, and configuration affect drainage and trap-seal protection.
Trap dip - The lowest curved portion of a plumbing trap that holds water to form a seal against sewer gases.
Trap primer - A device that supplies water to a floor drain or other trap to maintain its water seal and prevent sewer gases from entering the building.
Trap seal - The water retained in a plumbing trap that blocks sewer gases from passing into the occupied space.
Trap weir - The point in a trap where water spills over into the outlet side of the trap.
Turbulator - An internal component that creates turbulence in combustion gases or another fluid to improve heat transfer or mixing.
Underground storage tank (UST) - A tank buried below ground for storing liquids (usually water or fuel).
Undersized - Smaller than required for the intended flow, capacity, or load. Undersized plumbing can restrict water flow or drainage.
Union - A threaded or mechanical fitting that joins two sections of pipe and allows them to be disconnected without cutting the pipe.
Unvented location - A space without adequate ventilation or an appropriate venting arrangement. A fuel-burning appliance installed in such a location may have combustion or indoor-air safety concerns.
Vacuum - A pressure below the surrounding atmospheric pressure. Vacuum conditions in plumbing can contribute to siphoning or interfere with normal water flow.
Vacuum breaker - A backflow-prevention device that admits air when a vacuum develops, helping prevent contaminated water from being siphoned into a potable water supply.
Vegetable sprayer - A pull-out or separate spray attachment, commonly fitted to a kitchen faucet, used to rinse food and clean the sink.
Vent connector - The pipe connecting a fuel-burning appliance to a chimney or vent system that carries combustion gases outdoors.
Vent pipe - Piping that allows air to enter a drainage system and permits sewer gases to escape through an approved vent termination.
Vent stack - A vertical vent pipe that provides air circulation and pressure equalization for the drainage system.
Waste pipe - Piping that carries wastewater from plumbing fixtures toward the building drainage system.
Wax gasket - A wax sealing ring installed between a toilet and the floor flange to create a watertight and gas-tight connection.
Water closet - The formal plumbing term for a toilet fixture.
Water hammer - A pressure surge caused by a sudden change in water flow, often producing banging or knocking sounds in pipes.
Water heater - An appliance that heats domestic water using electricity, gas, oil, a heat pump, or another approved energy source.
Welded steel - Steel pipe manufactured with a welded seam or joined by welding. Its suitability depends on the intended service, material specifications, and installation requirements.
Wet vent / Wet venting - A drainage pipe that serves as a drain for one fixture while also providing venting for another fixture, where permitted by the applicable plumbing code.
Whirlpool bath / Whirlpool bathtub - A bathtub fitted with a pump and water jets that circulate bathwater. The pump, electrical protection, suction fittings, and access provisions are important inspection considerations.
Whirlpool bathtub / Hydromassage bathtub - See the definitions under W and H. Both describe bathing fixtures with powered water circulation or jets, although their specific designs may differ.
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