Is It Possible to Use Radiant Heating for Outdoor Spaces?

Outdoor Radiant Heating Systems

Outdoor radiant heating systems are often employed in areas like patios, walkways, and pool decks. These systems usually involve installing tubes or cables with heating elements beneath the surface. For example, you can use hydronic tubing, such as PEX, with a 1/2-inch diameter and a 10-foot length, buried 2-3 inches deep in the concrete slab. The system can be powered by a solar thermal collector or a heat pump.

System Design and Installation

To ensure the system operates efficiently and effectively, it’s essential to consider factors like thermal mass, insulation, and surface temperature. For instance, using a thick concrete slab with a high thermal mass can help store and release heat throughout the day. Additionally, insulate the tubing and heating elements to minimize heat loss. When designing the system, aim for a surface temperature of 45°F to 55°F (7°C to 13°C) above the ambient temperature to ensure comfortable warmth and prevent overheating.

Choosing the Right Heating Element

Selecting the right heating element for your outdoor radiant heating system is crucial. You can use electric resistance heating elements, like thermostatically controlled heaters, or hydronic heating elements, such as heat exchangers or boilers. Consider using a heat pump, which can provide a higher coefficient of performance (COP) and reduce energy consumption. For example, a high-efficiency heat pump with a COP of 3.5 can provide more heat energy while using less electrical energy.