Hot water boilers can be used to heat tap water in a separate tank, but the water for heating the radiators and for heating tap water are kept separate. Natural Gas Boiler Gas boilers are fueled by natural gas, pumped through a gas line running beneath the house via a pipeline from an adjacent road.
A slightly different type of radiator is used with hot water boilers, in which superheated water circulates through convection to the various radiators. In these systems, there are pipe connections only at the bottoms of the radiators. These are often called one-pipe systems.
Boilers that operate higher than 15 psig are called "high-pressure" boilers. A hot water boiler, strictly speaking, is not a boiler. It is a fuel-fired hot water heater. Because of its similarities in many ways to a steam boiler, the term ''hot water boiler'' is used.
Indirect water heaters: An indirect water heater utilizes heat that is supplied by a furnace, boiler, or heat pump. In an immersed coil installation, the hot water tank contains a heat exchanger that is connected to a furnace, boiler, or heat pump.
Boilers. Boilers are special-purpose water heaters. While furnaces carry heat in warm air, boiler systems distribute the heat in hot water, which gives up heat as it passes through radiators or other devices in rooms throughout the house. The cooler water then returns to the boiler to be reheated. Hot water systems are often called hydronic ...
The tankless nature of the heater means that your home's supply of hot water is effectively limitless - running out of hot water is a thing of the past. Finally, efficiency levels are much higher than tank-based water heaters because no energy is needed to keep the pre-heated water warm inside of the tank.
Among the different types of boilers, commercial boilers are some of the most diverse. These units can use propane, natural gas, non-fueled electric only, or light oil to provide hot water or steam for process requirements or comfort heating.