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Multi-Zoned Radiant Floor Heat


Why choose radiant floor heat?

More Comfortable

You cannot see radiant heating energy under normal circumstances; a special camera is needed. But you can certainly feel radiant heat; and it feels good!

Radiant heat is like sunshine, or warmth from a fire; it just makes you feel more comfortable and cozy.

When your floor is warm, your feet are warm too. The air that you breathe can be a little cooler and more refreshing.

More Energy Efficient

The sensation of comfort is caused by a combination of air temperature and radiant energy that equals the body’s energy needs. When you receive a greater amount of radiant energy, you will be equally comfortable at a lower air temperature.

It’s like being out in the sunshine. You are more comfortable at a lower air temperature. This lower air temperature will save you money on your energy bills.

Energy experts calculate that you can easily save 25% of your heating costs with a radiant heating system.

Cleaner and More Healthful

Healthfulness is one of the most important benefits of radiant heating. There are reasons why so many families have more illnesses in the winter.

Radiant heating does not blow dirt, dust, bacteria, viruses and pet dander around the house all winter long.

Unlike hot air systems, radiant heat will not dry out your breathing passages and leave them more vulnerable to infection.

One of our customers reported that their children’s asthma medication was reduced by half when they moved into a radiantly heated home.

Child Friendly and Safer

With radiant heat, there are no hot surfaces for children to touch and no radiators With radiant heat, there are no hot surfaces for children to touch and no radiators for them to fall onto.

They cannot drop their crayons into the hot air ducts.


A radiant heating system is felt but not seen or heard. There are no radiators to interfere with furniture placement or interior design.

There are no fans or blower noise. Just peace and quiet.

Simpler and More Reliable

An open loop system does not over complicate the radiant heating systems. In fact, it simplifies it.

In our opinion, the customer is not well served by a lot of bells and whistles. It should not take a rat’s nest of controls that no one understands well to operate a radiant system.

Advantages of radiant heat by Richard D. Watson

This article is reprinted from Fine Homebuilding

Studies conducted by the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) indicate that with radiant heating systems people can be comfortable at temperatures 6°F to 8°F lower than with convective systems. Forced-air and baseboard (whether electric or hot-water) heating systems are convective systems because they use air as the primary heat-transfer medium.

Typically, heating outlets or baseboards are placed on outside walls, and the system is designed to fill the area with warm air until the preset temperature on the thermostat is reached. The warm air rises to the ceiling until it cools, falling to the floor for return to the furnace or to fill the convective vacuum created by a baseboard heater. Air stratification and heat loss to the ceiling are significant with convective heat.

Air is transparent to the transfer of radiant energy, which occurs directly from warmer to cooler objects. With radiant floor heat, the temperature varies only about 2°F to 4°F between the ceiling and the floor, with the floor being about 2°F warmer than the air. And radiant floor heating results in reverse stratification.

Humidification is unnecessary with a radiant system because radiant heat does not alter residential air moisture content, which is generally adequate if the air isn't dried out by combustion or by increased infiltration of cold, dry outside air.

Glass, particularly low-e glass, reflects long-wave radiance produced by residential radiant systems. This greenhouse effect serves to contain radiant energy within the heated building cavity, reducing heat loss.

Air-infiltration heat loss is reduced with radiant heat. Air infiltration and exfiltration increase as the difference between inside and outside temperature (ΔT) becomes larger. When superheated air from a furnace or baseboard heater flows against relatively cold exterior walls, the increased temperature differential results in a stack effect that draws cold air into the house through any cracks. With radiant systems, the air is only warmed to the temperature of the thermostat setting (which is usually lower to start with), so the temperature differential at the outside wall is less, thereby reducing air infiltration.

When applied to the sizing of a radiant system, conventional heat-loss analysis often includes a reduction in design temperature from 70°F to 65°F and a 10% to 25% reduction in building air infiltration, exfiltration, stratification and glass heat loss. The average 65°F radiant comfort temperature with 59°F day/night setback should reduce building heat load by 25% to 35% over convective systems.

- Richard D. Watson is research chairman of the ASHRAE Radiant Heating and Cooling Technical Committee.

Member of the Texas Panhandle Builders Association
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