As an expert in the field of heating systems, I can provide you with a comprehensive analysis of the efficiency of hydronic heating. Hydronic heating, also known as radiant floor heating, is a method of heating that involves circulating heated water through a system of pipes, which are then embedded in the floor. This type of heating system has several advantages that contribute to its efficiency.

Energy Efficiency
Hydronic heating systems are considered to be more energy efficient compared to traditional forced-air systems. This is because they operate at lower temperatures but still provide comfortable heating. The heat is distributed evenly throughout the room, reducing the need for higher temperatures and thus conserving energy.

Heat Distribution
One of the key benefits of hydronic heating is its ability to distribute heat evenly across the floor. This results in a more consistent and comfortable indoor climate. The heat rises naturally, ensuring that the living space is warm at the level where people spend most of their time.

Control and Customization
Hydronic systems offer a high degree of control and customization. With zoned heating, different areas of a building can be heated independently, allowing for precise temperature control. This not only enhances comfort but also increases energy efficiency by preventing overheating in unoccupied areas.

Longevity and Maintenance
Hydronic systems are known for their longevity. The components used in these systems are typically durable and can last for many years with proper maintenance. This reduces the need for frequent replacements and repairs, which can be costly over time.

**Integration with Renewable Energy Sources**
Hydronic heating can be easily integrated with renewable energy sources such as solar thermal systems. This allows for the use of clean, renewable energy to heat the home, further increasing the efficiency and sustainability of the system.

Health Benefits
The even heat distribution of hydronic systems can also contribute to better indoor air quality. Unlike forced-air systems, which can circulate dust and allergens, hydronic heating does not create drafts or stir up particles, making it a healthier option for those with respiratory issues or allergies.

Initial Costs
While the initial installation cost of a hydronic heating system can be higher than that of a traditional system, the long-term savings in energy and maintenance costs can offset this investment. Additionally, the increased comfort and health benefits can add to the overall value of the system.

RESNet's Statement
Regarding the statement from RESNet, it is worth noting that radiant systems, including hydronic heating, are indeed more efficient in transmitting heat. The radiant heat transfer is more direct and requires less energy to achieve the same level of comfort as conventional radiators, which can lose heat through convection and radiation to the surrounding walls and ceiling.

Design and Construction
Hydronic radiant heating is often designed into new structures from the beginning. This allows for optimal integration with the building's architecture and ensures that the system is installed correctly for maximum efficiency. Retrofitting an existing building with hydronic heating can be more complex and may not yield the same level of efficiency.

In conclusion, hydronic heating is an efficient heating method that offers numerous benefits, including energy efficiency, even heat distribution, customization, longevity, integration with renewable energy sources, and health benefits. While the initial costs may be higher, the long-term savings and added value make it a worthwhile investment for many homeowners.

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RESNet adds that radiant systems transmit heat on average some 15 percent more efficiently than conventional radiators. ... Meanwhile, hydronic radiant heating, whereby heated water is forced through tubes under the floor, is more often designed into a new structure from the get-go, and is more energy efficient overall.read more >>