Hydronic Heating Systems Installed | Hydronic Radian
Boilers and other hot water heaters. There are different ways to heat the water used in a hydronic heating system. The most common heater is a boiler fueled by natural gas, propane, or fuel oil. Some hydronic heating systems rely on heat pumps, tankless "on-demand" water heaters, solar thermal systems, or even tank-type water heaters.