A new method for heating domestic water in pellet-fired boiler

May 23,2024

Many pellet boilers are retrofitted into homes with existing hydronic heating. Figure 1 shows a common configuration for these existing systems. An oil-fired cast-iron boiler supplies several zones of fin-tube baseboard and an indirect water heater. The boiler has a fixed high-limit controller that’s typically set in the range of 170° to 180º F. The relatively low thermal mass and high water temperature requirements of the fin-tube baseboard allow the boiler to remain above the dew point of the flue gases the vast majority of . . .