What Is Hydronic Heat?

How It Works

• Hydronic heat works through conduction -- the transfer of heat from one object to another; and radiation -- the transfer of thermal waves through space. To understand conduction, imagine standing on hot sand and cold tile in bare feet. The sensation is very different as first heat and then cold is conducted from the surfaces to your skin. Thermal radiation is what you see on hot days when waves of heat rise from sidewalks and roadways, creating a shimmering effect in the air.

Comfort Zones

• Once the hydronic heat system is set to a comfortable temperature, the system maintains a constant comfort zone throughout the living space. This is made possible by the fact that liquids conduct heat much more efficiently than air and the heat is easily transferred throughout the home.

Flooring

• The most common type of hydronic heating system is one that is installed under the floor. In this case, the type of flooring used on top of the system is important as certain flooring materials are better heat conductors than others. For instance, ceramic tile is the most desirable type of flooring to use because of its excellent thermal conductivity and ability to store heat for extended periods. Less desirable flooring materials include linoleum and carpet. They act as insulators and prevent you feeling the full benefit of the hydronic heat.

Hydronic and Forced Air Systems Comparison

• Homeowners considering hydronic heating should compare it with traditional forced air heating systems. Forced air systems have the ability to quickly raise the temperature in a home; the hydronic system takes longer as the materials must heat before the air. Without ducting and forced air, the hydronic system does not dry the air or force dust and allergens into the living space. This is especially beneficial for people who suffer from asthma or allergies.

Costs

• Initial costs comparisons definitely tilt in favor of the forced air systems. Installing hydronic heating during new construction is far more expensive. However, the cost-savings due to lower energy bills will negate the upfront costs over time. Additionally, since hydronic heating is considered to be eco-friendly the government offers incentive programs designed to help defray the initial investment by the homeowner.