What You Should Know About Radiant Snow Melting Systems
Overview of Topics:
- • A Brief History of Radiant Heat
- • Overview of Basic Components and How Snow Melting Systems are Installed
- • How do Heated Driveways Work?
- • What are the Operating Costs of a Heated Driveway?
- • What to Look for When Purchasing a Radiant Heat System
- • Comparing Heated Driveway Systems
A Brief History of Radiant Heat
Radiant heat is perceived to be a relatively new technology, but in fact, radiant heat was used thousands
of years ago. While evidence points to civilizations in Asia using radiant heat 10,000 years ago, it was the
ancient Romans who refined the technology (circa 500 B.C.), creating an under floor heating system called a
“hypocaust”. A series of tiled pillars, roughly 2-feet high, supported the slab floor. Spaces were also
created inside the walls of the building.
A wood-fired furnace was located at the outside of the building and placed below the floor level. Heat from
the furnace rose into the space below the floor and rose up through, and eventually out of the walls, spreading
warmth as it travelled through the structure. The system worked surprisingly well, provided there was someone
continually feeding the furnace with wood.
In the 1980s, the first standards for floor heating systems were developed in Europe. During this decade, radiant floor heating became the traditional heating system for residential buildings in Middle Europe and Nordic countries, as well as several countries in Asia. Eventually, western countries embraced radiant heat, utilizing hydronic (water-based) and electric technologies. Today, heated driveways and floor heating systems are rapidly gaining popularity throughout Northern America.
Warmzone design/layout of heated paver driveway.
ClearZone heating mats rolled out over paver dust.
The completed heated driveway with brick pavers.
System Components and Overview of How Snow Melting Systems are Installed
Heated driveways utilize a heating element (heat cable), an aerial-mount or ground-mount activation device (snow sensor)
and contactor panel. Electric snow melting systems use twin conductor, resistance heat cable that is ideally embedded about
2-inches below the driveway's surface. The cold leads of the heat cable are then run to the contactor panel, which is
typically installed on the wall in the garage. (For more information about the benefits of radiant snow melting systems, visit our
Heated Driveway Benefits
web page.) The cable can be installed under pavers, in concrete and even in hot asphalt applications.
Most residential heated driveway systems feature an aerial-mount snow sensor that is typically installed at the roof's edge, just above the roof line. The device has temperature and precipitation sensors, so the automated system operates only when needed. When the in-ground activation device is used, it is used in conjunction the small Warmzone snowmelt control unit. This NEMA 1 wall-mount control panel is approximately 6x3.5 inches and is designed to also be controlled from an external signal (day/week timer, GSM-module or other signal source). The compact controller can be switched on/off (standby) and the snow melting system can be manually turned on in case wind causes snow drifts or ice forms in the shade. Read more about INSTALLING A HEATED DRIVEWAY.
How do Heated Driveways Work?
When the activation device/snow sensor detects moisture and the temperature is below the set point (usually 39° Fahrenheit),
it signals the contactor panel to send power to the embedded heat cable. The surface quickly warms and prevents the accumulation
of snow. The system remains on for a short time after the snow stops falling to dry the surface of the driveway and prevent ice
from forming. Then, the snow melting system shuts off. Most snow melting systems also include manual override capability to melt
snow drifts that may have formed due to wind or to preheat an area before a large storm to better prevent snow and ice
accumulation. Read more about
HOW HEATED DRIVEWAYS WORK.
What are the Operating Costs of an Electric Heated Driveway?
Like snowflakes, no two radiant driveway heating systems are exactly alike. Each system is designed according to
the specifics of the project, such as the average temperature and snowfall associated with the location of the system.
However, a formula can be used to calculate the general operating costs if you were to install a heated driveway.
|1.||Determine the total square footage of the area that will be heated.|
|2.||Multiply the square footage by the heat required (37 watts per square foot for residential properties). This gives you a total for the watts per square footage required.|
|3.||Divide this number by 1,000 to convert to kilowatts.|
|4.||Look up the kilowatts-per-hour rate from the local power utility company.|
|5.||Multiply the total watts-per-square footage by the watts-per-hour. This gives you the cost-per-hour of usage for the snow melting system.|
|6.||NOTE: Heating cables and mats are rated in total watts. If the snowmelt system is intended for a commercial application, then you would multiply the total square footage by 50 watts to get a total wattage required. (E.g., 5,000 sq. ft. x 50 watts = 250,000 watts required.)|
What to Look for When Shopping for a Radiant Heated Driveway System
There are many radiant heat providers offering snow melting solutions, but the products and services can vary greatly.
So what do you look for? How do you know if one system is better than another?
First of all, one of the most important things for you to know is that a radiant heating system is only as good as its installation. So if you're serious about finding the best system for the best price, you'll want more than proven products. You'll want a provider that backs up its products and includes premier system design, training, and support services. Check out the list below: