Radiant Glossary

A B C D E F G H I J K L M N O P R S T U V W Z

Numerical
10/2 Conductor

A
Activation
Activation Device
AFUE (Annual Fuel Utilization Efficiency)
Alternating Current
Ambient Temperature Sensor
Amp (Ampere)
Anchor Plug Kit
Asphalt
AutoCAD
AWG (American Wire Guage)

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B
Backer Rod
Back Plate
BTU
Bulding Code

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C
Cable Repair Kit
CADD (Computer Aided Design and Drafting)
Castle Chairs
Cathode Ray Tube
Caulk
Chairs
Chalk Line
Cold Joint or Mark
Cold Lead
Cold Lead Extension Kit
Combustion Efficiency
Concrete
Conduit
Continuity
Contractor
Control Unit
Crimping Tool
Cut Out Kit

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D
Detailed Drawing
Dowel
Downspout
Drip Edge

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E
Eave
Element Test
Elevated Sleepers
Enclosure Kit
Energy Efficiency
ETL

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F
Fault
Flashing
Floorizwarm
Floor Temperature Sensor

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G
Gang Box
GFCI
Green Building
Ground Wire
GutterMelt

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H
Heat Loss Calculation
Heatsink
Heatizon Heatsink Kit
Heat Trace
Heatwave

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I
Ice Dam
Insulation
Invizimelt

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J
Joint
Joint Jumper Kit
Jumpering

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K
Knockout Opening
kVA (Kilovolt Ampere)

L
Lath
Leads, Cold

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M
Mark
Magnetic Field
Metal Drip Edge
Metal Lath
Metal Studs
MIC
Mortar
Mortar Bed
Mud Bed

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N
NEC (National Electric Code)

O
On Center
Ondol
Overcurrent

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P
Pavers
Pole, Single and Double
Primary Heat
Programmable Thermostat

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R
Radiant Heat
Radiant Panel
RPA (Radiant Panel Association)
Radiant Trak
Renewable Energy
Resistance
Retrofit
Roof Alarm
Roof Deicing
Rough-in
R-Value

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S
Sawcut
Schematic
Selector Box
Self Regulating Cables
Sensor, Infloor
Sensor, Moisture/Temperature
Short
SI
Slab on Grade
Snow Load
Solder
Solid State
Space Heating
Specification (Also Called Specs)
Splice
Subfloor
Subroof
System Operating Tables

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T
Thermostat
Thermometer
Timer
Transformer
Transition Plate
Tuff Cable

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U
UL
Undercurrent

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V
Valley
Valley Metal
Volt

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W
Watt
Welded Wire Fabric

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Z
ZMesh
Zoned Heating
Zone


10/2 Conductor –
A standard Romex wire that contains a ground wire and two separate wires used for conducting electricity.

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Activation
An automated or manual method of turning a radiant snow melting system, radiant floor heating system, radiant roof snow and ice melt system, or radiant heating system on and off.

Activation Device
A sensor, thermostat or any other device that is used to turn a heating/snow melting system on and off.

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AFUE (Annual Fuel Utilization Efficiency)
AFUE is a rating for combustion heaters such as boilers, hot water heaters, or forced air heaters. It is the ratio of annual output energy to annual input energy.

Alternating Current
An electrical current that oscillates in magnitude and polarity. It’s usual waveform is that of a sine wave, which generally results in the most efficient transfer of energy.

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Ambient Temperature Sensor
The temperature of something surrounding something else, i.e. The ambient temperature of a room is the temperature of the air surrounding a mechanism to measure temperature.

Amp (Ampere)
A unit of electrical current. It is measured as the amount of charge (coulombs) used per unit time (seconds).

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Anchor Plug Kit
A kit which allows for the installation of wire onto a concrete surface. Holes are drilled into the concrete, wooden dowels are inserted into the holes and nails are then used to attach wire clips to the wooden dowels.

Asphalt
A thick, black, petroleum based substance commonly used for paving and waterproofing.

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AutoCAD
AutoCAD is a suite of CAD (Computer Aided Drawing) software products for 2- and 3-dimensional design and drafting, developed and sold by Autodesk, Inc.. The original concept of AutoCAD in the 1980s was to promote customization and feature extensibility, and was what made it especially appealing to customers.

AWG (American Wire Gauge)
The standard method of denoting wire diameter. The larger the gauge, the smaller the wire. For #14 gauge wire, the gauge is the number of bare wires that, when placed side by side, are 1 inch wide.

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Backer Rod
A rope shaped foam material used to support and maintain the proper depth of caulking or sealant installed over it.

Back Plate
A back plate mounts to a wall on 16″ studs or rough-in box and provides support and strength and. The other components of the system are later mounted to the back plate.

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BTU
The British thermal unit (BTU or Btu) is a unit of energy used globally in the power, steam generation and heating and air conditioning industries. Although it is in common use in these industries, in scientific use it has been replaced by the SI unit of energy, the joule (J). In North America, the term “BTU” is used to describe the heat value (energy content) of fuels, and also to describe the power of heating and cooling systems, such as furnaces, stoves, barbecue grills, and air conditioners. When used as a unit of power, BTU per hour (BTU/h) is understood, though this is often confusingly abbreviated to just “BTU”. In the UK and other parts of the world it is written BTU. One Watt is equivalent to 3.41 BTU/hr.

Building Code
A building code is a set of rules that specify the minimum acceptable level of safety for constructed objects such as buildings and nonbuilding structures. The main purpose of the building codes is to protect public health, safety and general welfare as they relate to the construction and occupancy of buildings and structures.

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Cable Repair Kit
When Tuff Cable is damaged, a Cable Repair Kit is used to repair the damaged portion of the cable without replacing the entire length of cable.

CADD (Computer Aided Design and Drafting)
Computer-aided design and Drafting (CADD) is the use of a wide range of computer-based tools that assist engineers, architects and other design professionals in their design activities. It is the main geometry authoring tool within the Product Lifecycle Management process and involves both software and sometimes special-purpose hardware. Current packages range from 2D vector based drafting systems to 3D solid and surface modellers.

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Castle Chairs
Castle Chairs are used to raise heating element attached to welded wire fabric closer to the surface of the new pour concrete. By so doing it can improve snow melting/slab warming efficiency.

Cathode Ray Tube
A Cathode Ray Tube (CRT) utilizes electrons and magnetic fields to display images on a screen. Older model televisions and computer monitors use this technology. The use of a magnetic field in the CRT makes it susceptible to distortion caused by other electromagnetic fields that occur near/around them.

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Caulk
Caulk is used to seal ships, buildings, or other surfaces to make them water tight. It is specifically used with radiant heating systems to seal asphalt or concrete surfaces after a snow melt system has been retrofitted into them.

Chairs
See Castle Chairs

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Chalk Line
A Chalk Line is used to create straight lines over a long distance. A length of string, saturated in chalk, is stretched across the distance to be marked. The string is pulled tight and each end is pressed against the surface to be marked at beginning or ending points. The middle of the string is then pulled away from the surface to be marked while the end points remain pressed against the surface. The middle is released and strikes the surface to be marked, leaving a straight line of chalk on that surface. In outdoor conditions a clear polyurethane will be sprayed over the line to protect it from rain and snow. Chalk lines are frequently used by Heatizon Installers to mark where grooves should be sawcut in retrofit applications.

Cold Joint or Mark
A cold joint or mark is a joint or cut which allows for the vertical and/or horizontal expansion and contraction in concrete. Running the tubing or cable of a snow melt system through a joint of any kind is potentially hazardous to radiant heating systems. A Joint Jumper is generally used to prevent damage to a radiant heating system.

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Cold Lead
Cold lead conducts electric current from the control unit or activation device to the heating element of a radiant heating or snow melting product. It has very little resistance to reduce the loss of heat and power over the distance traveled.

Cold Lead Extension Kit
The Cold Lead Extension Kit is used to lengthen the Cold Lead.

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Combustion Efficiency
Combustion Efficiency is the efficiency in a boiler, hot water heater, or forced air heater. It refers only to the possible output of heat, and not the actual heat output. It only accounts for heat loss through the exhaust flue.

Concrete
Concrete consists of cement, aggregate, and water. Water reacts with the cement and produces a chemical reaction that binds the cement and aggregate producing a stone like material. It is used in the construction of buildings, driveways, walkways, roadways, etc.

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Conduit
Conduit is a housing used to protect wires and cables in an electrical system from damage and moisture. Conduit is made of PVC or metal and is available in various sizes.

Continuity
An electrical circuit has continuity when there are no interruptions, such as breaks, in the path of electrical conduction.

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Contractor
A contractor is an organization or individual that contracts with another organization or individual to build a road, building or other facility.

Control Unit
The control unit monitors the operation of a radiant heating, snow melt, floor warming or roof deicing system. It has built-in safety features to monitor for overcurrent and undercurrent or short in the Tuff Cable or ZMesh radiant heating element.

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Crimping Tool
A crimping tool is used to crimp or attach a wire to some other object such as a Tuff Cable butt splice, E210 butt splice or ZMesh Transition Plate. The wire is placed inside that object and the crimping tool is used to squeeze that object tight around the wire.

Cut Out Kit
A cut out kit allows for ZMesh to be used in a location where a hole exists in the flooring that cannot be covered with ZMesh such as a drain, electrical circuit or vent. A portion of the ZMesh is cut to fit around the hole and a copper plate is used to facilitate the flow of the electric current.

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Detailed Drawing
See Schematic

Dowel
A round piece of wood, approximately one inch long that is used to secure Tuff Cable or Floorizwarm Tuff Cable to existing asphalt or concrete.

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Downspout
A Downspout channels the water gathered by rain gutters or a flat roof drain system down to the ground.

Drip Edge
A drip edge is a type of flashing that is installed on the front edge of a roof to prevent water from seeping back under the roofing material.

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Eave
An eave is the overhang on a roof which protects the building from weather damage. It is especially prone to ice dams and icicles which can cause water damage to a building.

Element Test
Heatizon Systems recommends that an element test be conducted at numerous different times of an installation process. An element test will check for electrical continuity in a systems and will help insure that the systems has been installed without any damages.

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Elevated Sleepers
Elevated Sleepers are used to raise up or provide a nailing area for hardwood flooring. When most other floor heating or floor warming products are installed (other than Heatizon Systems ZMesh), sleepers are essential whenever a mud bed is required for hydronic and high voltage radiant floor heating systems because they create an area to place the heating element or pex tubing.

Enclosure Kit
An Enclosure Kit is used to house one or two Control Units in an outdoor area. It is designed to protect the electric components from the elements and allows for the dissipation of heat.

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Energy Efficiency
Energy Efficiency in Radiant Heating applications is the ratio between the amount of useful heat produced and the energy required to produce it.

ETL
“Intertek’s ETL SEMPKO division is a global leader in testing, inspection, and certification of products for manufacturers and retailers around the world.” (www.intertek-etlsempko.com)

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Fault
A Fault is any condition that turns off the control unit and turns on the fault light. It most commonly occurs when one or more conductors of electric current short to each other or find a path to ground.

Flashing
Flashing is the weatherproofing shielding used to prevent intrusion of water into buildings. It can assume a number of forms such as: roof flashing, wall flashing, base flashing, etc.

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Floorizwarm
Floorizwarm is one of Heatizon System’s low voltage radiant heating systems. It utilizes a step down transformer and Heatizon System’s Floorizwarm Tuff Cable to provide, low voltage, cost effective radiant heat. It is particularly applicable to small areas. Various Floorizwarm system models are available, and are capable of heating from 15-110 square feet.

Floor Temperature Sensor
A Floor Temperature Sensor is used in radiant floor heating applications to measure the temperature of a floor. It is used to activate a radiant floor heating system should the temperature of the floor drop below the desired temperature.

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Gang Box
Also knows as an electrical outlet box, a gang box houses electrical fixtures such as outlets, switches and thermostats.

GFCI
A GFCI or Ground Fault Circuit Interrupter is an electrical wiring device that disconnects a circuit whenever it detects that the flow of current is not balanced between the phase (“hot”) conductor and the neutral conductor. The presumption is that such an imbalance may represent current leakage through the body of a person who is grounded and accidentally touching the energized part of the circuit. A shock, possibly lethal, is likely to result from these conditions.

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Green Building
Green building is the practice of increasing the efficiency of buildings and their use of energy, water, and materials, and reducing building impacts on human health and the environment, through better siting, design, construction, operation, maintenance, and removal — the complete building life cycle.

Ground Wire
A ground wire is used to return to earth or ground in an electrical circuit.

GutterMelt
GutterMelt is a snow melting and deicing system which prevents ice and snow build up from occurring at the rain gutters, downspouts and eaves.

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Heat Loss Calculation
A heat loss calculation is determined by the type and amount of insulation and materials used to construct a building. It determines the ability of a building to hold heat in and calculates how much heat/energy must be put into a home to keep it warm.

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Heatsink
A Heatsink is a material with high thermal conductivity. It facilitates the transfer of heat from one medium to another. Heatsinks commonly used in radiant heating applications are: sand, thinset, mortar, concrete, asphalt and a Heatizon Heatsink Kit.

Heatizon Heatsink Kit
A Heatsink Kit is a patented application. A Heatsink Kit facilitates the installation of a radiant heating cable on a roof but under the roofing material. It can also be used on floors and decks when needed. Heatizon Systems Heatsink Kit uses a layout of Heatsink boards to allow a radiant heating product to be installed on a roof and in a heatsink at the same time.

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Heat Trace
High voltage heating cable used in gutters and downspouts to prevent ice and snow buildup. Prior to Heatizon Systems roof snow melt and deicing products, Heat Trace was used in a “zig zag” fashion on roofs to provide a channel for melted snow and ice to travel in.

Heatwave
Heatizon Systems Heatwave products come in pre-set lengths and sizes and operate off of line voltage to provide radiant heating in small areas such as bathrooms and kitchens.

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Ice Dam
An ice dam is ice that forms over the exterior wall of a building that prevents water, formed from melted snow and ice, from draining off the roof.

Insulation
The term insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. Heat is transferred from one material to another by conduction, convection and/or radiation. Insulators minimize the transfer of heat energy. In home insulation, the R-value is an indication of how well a material insulates.

Invizimelt
Invizimelt is a Heatizon trademark and brand name for a heatsink system used for Tuff Cable. Invizimelt is an aluminum panel that Tuff Cable snaps into allowing a rapid heat transfer compared to traditional heatsink and cementitious based substrates. Invizimelt can be used for roof deicing and under decks and other surfaces.

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Joint
See Cold Joint or Mark

Joint Jumper Kit
A kit which is used to prevent damage to Tuff Cable heating element by avoiding running it directly through joints and marks in concrete. The kit connects the Tuff Cable to cold lead and runs the cold lead under the concrete where the joint or mark exists and then connects once again to the Tuff Cable.

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Jumpering
See Joint Jumper Kit.

Knockout Opening
A pre-punched area in sheet metal that can be removed to provide an opening for a specific purpose.

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kVA (kilovolt Ampere)
A kilovolt ampere is a rating used for certain devices operating off of alternating current. It is in essence the number of “apparent” watts that that device is rated for.

Lath
A metal or plastic mesh material used as a substructure for plaster or tiles.

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Leads, Cold
See Cold Lead.

Mark
See Cold Joint or Mark

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Magnetic Field
In physics, a magnetic field is a force field that surrounds electric current circuits. A magnetic field can also be found in the vicinity of ferromagnetic materials such as iron. The existence of a magnetic field is ascertained by its effects. The most important of these effects are (1) Force on a moving electrically charged particle, (2) Force on a stationary charged particle when the magnetic field is changing, (3) Mutual force acting between two objects or electric current circuits that are surrounded by a magnetic field.

Metal Drip Edge
A metal drip edge helps to prevent water from seeping back under the shingles. It is placed along the edge of a roof.

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Metal Lath
See Lath.

Metal Studs
Metal Studs are used in place of wood framing. All electrical wires run with metal studs should be run through the same holes to reduce magnetic field disruption.

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MIC
Mineral Insulated or MI Cables are high voltage electric cables used for providing radiant heat.

Mortar
A cementitious building material (as a mixture of cement, lime, or gypsum plaster with sand and water) that hardens and is used in masonry or plastering.

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Mortar Bed
A layer of cementitious material used to level, slope, and/or stabilize a subfloor or other substrait.

Mud Bed
See Mortar Bed.

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NEC (National Electric Code)
The NEC is a set of electrical standards for buildings and structures. The NEC protects the public by establishing requirements for electrical wiring and equipment in virtually all buildings.

On Center
On Center denotes the way that a distance between two objects should be measured. In the framing of a home, studs are placed sixteen inches on center. This means that from the center of one stud to the center of the other stud is a total distance of sixteen inches.

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Ondol
also called Gudle, is a traditional Korean underfloor heating system for indoor climate control.Ostensibly it is comparable in principle to a Roman hypocaust, but differs in that the prototype of Ondol was originally intended to circulate heated air, for both cooking and floor heating, while hypocaust was to circulate heated air under the stone platforms in public baths.

Overcurrent
Overcurrent occurs when the amperage of a system is above the anticipated or normal operating level.

Pavers
A paver is a brick-like piece of concrete commonly used as exterior flooring. In a factory, pavers are made by pouring a mixture of concrete and some type of coloring agent into a mold of some shape and allowing it to set. They are applied by pouring a standard concrete foundation, spreading sand on top, and then laying the pavers in the desired pattern. No actual adhesive or retaining method is used other than the weight of the paver itself. Pavers can be used to make driveways, patios, and other outdoor platforms.

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Pole, Single and Double
A single pole breaker is the breaker used for 110 volt power. A double pole breaker is for 220 volt power. It is designed as two single pole breakers connected together and feeds two sources of 110 volt power into one to make 220 volts. It is designed so that if one of the two 110 volt breakers trip, it will automatically trip the second.

Primary Heat
Primary heat refers to the main source of heating in a building.

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Programmable Thermostat
A programmable thermostat is a thermostat which is designed to adjust the temperature according to a series of programmed settings that take effect at different times of the day. Programmable thermostats may also be called setback thermostats or clock thermostats.

Radiant Heat
Radiant is a heating system which uses electric resistance wire, mesh (or hot water in pipes) to heat the floors, walls or ceilings of a room. The technology has existed since the Roman use of Hypocaust heating. The heat energy is emitted from a warm element (floor, wall, overhead panel) and warms people and other objects in rooms rather than directly heating the air. The internal air temperature for radiant heated buildings may be lower than for a conventionally heated building to achieve the same level of body comfort (the perceived temperature is actually the same).

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Radiant Panel
A radiant panel is any object (wall, floor ceiling, etc.) that is used to provide radiant heat.

RPA (Radiant Panel Association)
An association of manufacturers, distributors and installers of radiant panel heating products.

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Radiant Trak
Radiant Trak is a Heatizon Systems snow melting product that is installed on of the area to be heated. It can be removed and reinstalled at any time.

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Renewable Energy
Renewable Energy is energy derived from resources that are regenerative or for all practical purposes cannot be depleted. For this reason, renewable energy sources are fundamentally different from fossil fuels, and do not produce as many greenhouse gases and other pollutants as fossil fuel combustion. Mankind’s traditional uses of wind, water, and solar energy are widespread in developed and developing countries; but the mass production of electricity using renewable energy sources has become more commonplace recently, reflecting the major threats of climate change, exhaustion of fossil fuels, and the environmental, social and political risks of fossil fuels. Consequently, many countries promote renewable energies through tax incentives and subsidies.

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Resistance
Electrical resistance is a measure of the degree to which an object opposes an electric current through it. The SI unit of electrical resistance is the ohm.

Retrofit
The installation of a new product into or on an already completed project. For example, retrofitting would be to install a radiant heat system into existing concrete without removing or replacing concrete.

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Roof Alarm
A Heatizon Systems Roof Alarm is used when installing ZMesh or Tuff Cable on a roof. Since roofs are built with many different electrically conductive materials (flashing, rain gutters, drip edge, roof straps, etc.) A roof alarm will insure that the heating element is never shorted to any other conductive material while the roofing is being installed.

Roof Deicing
The process of removing dangerous snow, ice and icicles from a roof. Tuff Cable and ZMesh are the best ways to eliminate ice dams and snow build up.

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Rough-in
The process used to prepare a site for a radiant heating system. It generally consists of the installation of cold leads, thermostat wire, and wall mounting mechanisms and primary power supply.

R -Value
The R-value is a measure of thermal resistance used in heat transfer problems. The SI units for thermal resistance are K·m²/W. R-values are commonly used to characterize thermal insulation materials in buildings.

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Sawcut
Grooves cut in concrete or asphalt which are used in retrofit instalations. Radiant heating cable is then placed in the grooves and a caulk is used to fill in the grooves over the heating cable

Schematic
A diagram that represents the elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic usually omits all details that are not relevant to the information the schematic is intended to convey, and may add unrealistic elements that aid comprehension.

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Selector Box
Heatizon Systems uses a selector box in conjunction with another activation device to prevent numerous electric radiant heating systems for turning on at the exact same moment. If numerous systems all turn on at once the startup current can trip the breaker to your home.

Self Regulating Cables
A form of electric heat tracing cable most commonly used for freeze protection that has power output as a function of the temperature at any location in the element. The result is that the output of the heater decreses as the temperature rises. (see GutterMelt)

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Sensor, Infloor
A sensor that is installed into a floor to monitor its temperature. It is particularly common in radiant heating applications because of its ability to sense floor temperature.

Sensor, Moisture/Temperature
A sensor that is used in snow/ice melting applications to monitor the exterior temperature and moisture content of the air. When moisture and a near freezing temperature are sensed, the sensor activates the snow melting systems before snow and ice accumulate.

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Short
In electrical devices, unintentional shorts are usually caused when a wire’s insulation breaks down, or when another conducting material is introduced, allowing charge to flow along a different path than the one intended.

SI
The International System of Units (abbreviated SI from the French Le Système international d’unités) is the modern form of the metric system. It is the world’s most widely used system of units, both in everyday commerce and in science.

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Slab on Grade
Slab-on-grade foundations are a building engineering practice whereby the concrete slab that is to serve as the foundation for the structure is formed from a mold set into the ground. The concrete is then poured into the mold, leaving no space between the ground and the structure. This type of construction is most often seen in warmer climates, where ground freezing and thawing is less of a concern and where there is no need for heat ducting underneath the floor.

Snow Load
Snow Load is the force exerted on roof structures by the weight of accumulated ice and snow. Snow Load requirements vary dramatically by geographic location of the project, characteristics of the building or its location that influence the accumulation of snow and ice on the roof structure and the water content of the snow.

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Solder
A solder is a fusible metal alloy, with a melting point or melting range of 180-190°C (360-370 °F), which is melted to join metallic surfaces, especially in the fields of electronics and plumbing, in a process called soldering.

Solid State
Solid State refers to a system that has no moving parts. They are an advantage because they do not wear or require routine maintenance.

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Space Heating
Space heating is the heating of a space, usually enclosed, such as a house or room.

Specification – (Also Called Specs)
A part of the manufacturer’s documents, typically used by engineers and architects, consisting of written details of materials, equipment, products, methods, standards and workmanship.

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Splice
The joining of electrical wires. A splice can be made using numerous different methods such as soldering, wire nuts, butt splices, ZMesh Z fold splice plates, etc.

Subfloor
A rough floor laid as a base for a finished floor. It is generally made of plywood or waferboard and is installed over the joists and under the finished flooring.

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Subroof
A material laid over the roof support and under the finished roofing material.

System Operating Tables
Heatizon Systems’ System Operating Tables list Transformer sizes and the amperage/wattage values that they will operate at using varying lengths of Tuff Cable or ZMesh element. These tables may be used as a general guild in selecting the proper voltage tap for use with the specific length of heating element that your particular installation requires.

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Thermostat
A thermostat is a device for regulating the temperature of a system so that the system’s temperature is maintained near a desired setpoint temperature. The thermostat does this by controlling the flow of heat energy into or out of the system. That is, the thermostat switches heating or cooling devices on or off as needed to maintain the correct temperature. Thermostats can be constructed in many ways and may use a variety of sensors to measure the temperature. The output of the sensor then controls the heating or cooling apparatus.

Thermometer
A device that measures temperature.

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Timer
A timer is a specialized type of clock. A timer can be used to control the sequence of an event or process. In radiant heating applications, timers can be used to manually turn on a system and then automatically turn it off after a set amount of time.

Transformer
A transformer is a device that transfers electrical energy from one circuit to another by magnetic coupling without requiring relative motion between its parts. It usually comprises two or more coupled windings, and, in most cases, a core to concentrate magnetic flux. An alternating voltage applied to one winding creates a time-varying magnetic flux in the core, which induces a voltage in the other windings. Varying the relative number of turns between primary and secondary windings determines the ratio of the input and output voltages, thus transforming the voltage by stepping it up or down between circuits.

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Transition Plate
Used with ZMesh heating element, it is a copper plate used to connect the ZMesh to the cold leads that run from the control unit.

Tuff Cable
Tuff Cable is a low voltage radiant heating element that must always be installed in an acceptable heatsink.

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UL
Underwriters Laboratories Inc. (UL) is a not-for-profit, privately owned and operated product safety testing and certification organization. Based in Northbrook, Illinois, UL develops standards and test procedures for products, materials, components, assemblies, tools and equipment, chiefly dealing with product safety.

Undercurrent
Undercurrent occurs when the amperage of a system is below the suggested or normal operating level.

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Valley
A valley is a location on a roof where two roof sections meet together forming a concave joint. Valleys are especially susceptible to ice dams and often need some form of ice melting system.

Valley Metal
Valley Metal is flashing that is placed in a valley to prevent leaking from occurring.

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Volt
The volt (symbol: V) is the SI derived unit of electric potential difference or electromotive force.

Watt
The watt (symbol: W) is the SI derived unit of power, equal to one joule per second. A watt also refers to the amount of heat that is given off by an electric radiant heating system. The power of a system can be calculated by multiplying the voltage (see Volt) by the current (see Amp).

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Welded Wire Fabric
Welded wire fabric is often placed in concrete to provide strength and add reinforcement. It is used often with Heatizon Systems Tuff Cable. Tuff Cable is attached to the welded wire fabric and the fabric is then settled 2-3 inches below the surface of the new concrete to provide maximum efficiency.

ZMesh
Heatizon Systems ZMesh is a bronze screen similar to that found in screen doors that is used in Radiant Heating Applications. ZMesh is designed to go on a wood or concrete subfloor or subroof, and under any non-conductive floor or roof covering.

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Zoned Heating
Zoned Heating allows for temperature variability throughout a building or home. Zoned heating uses numerous zones, each with their own activation device. Each zone can then be adjusted to the desired temperature.

Zone
Zone refers to the area that is covered by each individual control unit in an electric radiant heating system. The larger the area to be heated, the more zones that will be installed.