Radiant heat systems can be powered by a variety of energy sources, including:

1. Gas: Gas-fired radiant heat systems use natural gas, propane, or another type of gas as the energy source. These systems typically use a boiler to heat water or another liquid, which is then circulated through pipes or tubes to the radiant heat panels or other heating elements.
2. Oil: Oil-fired radiant heat systems work similarly to gas-fired systems, but use oil as the energy source. They may be less common in some areas, due to the cost and availability of oil as well as environmental concerns.
3. Electricity: Electric radiant heat systems use electric cables or matting installed in the floor or wall panels to generate heat. These systems may be more expensive to operate than other types of radiant heat systems, especially if electricity prices are high.
4. Renewable energy: Radiant heat systems can also be powered by renewable energy sources, such as solar panels or geothermal systems. Solar-powered radiant heat systems use solar panels to generate electricity, which is then used to heat water or another liquid that is circulated through the radiant heat system. Geothermal radiant heat systems use heat from the earth to heat a liquid, which is then circulated through the radiant heat system. These types of systems may be more expensive to install but can provide long-term energy savings and reduce the carbon footprint of a home.

It is important to carefully consider the energy source for a radiant heat system to ensure that it is the most cost-effective and efficient option for the specific needs of a home.