Therm 4.0kW Flo Thru Heater [15" x 2"] [240V] [Hercules] (C2400-0315) dialvalves An air shutter is useful

An air shutter is useful because it helps regulate the amount of combustion air entering the burner area

Supports 1-1/2 inch slip or 2 inch spigot connection styles

The model compatibility and horsepower range give this part practical value because internal wear components work best when they match the original hydraulic relationship closely

Designed for compatible bath applications

Improves lighting atmosphere and service confidence

Therm 4.0kW Flo Thru Heater [15" x 2"] [240V] [Hercules] (C2400-0315) dialvalves An air shutter is usefulThe Therm 4. 0 kW flo thru heater is designed for compatible Hercules applications using a 2 inch by 15 inch 240 volt format. A correctly matched heater is useful because it restores the heating section while preserving the physical size and connection style that the system was designed to use. This replacement is especially useful when the original heater has stopped heating reliably, has failed electrically, or is no longer suitable for continued