Danfoss 030N6201, 030N1201 FPHB5 preheater

This Danfoss preheater carries the manufacturer codes 030N6201 and 030N1201, listed under catalogue article 327.586.009, and belongs to the FPHB5 series. It is an oil preheater – a component used in oil burners that burn heavier fuel grades. Such preheaters warm the oil before it reaches the nozzle, lowering its viscosity so that the oil atomises properly inside the combustion head. Without adequate preheating, heavy oil forms large droplets that burn incompletely, producing soot and reducing efficiency. In a typical oil burner system the preheater sits between the oil pump and the nozzle, often close to the solenoid valve that controls the fuel cut‑off. The pump draws oil from the tank, the preheater raises its temperature, and the pressurised oil then passes to the nozzle. Parts of this type are usually selected by heater power (in watts), supply voltage, connection thread size, and whether they include an integral thermostat to regulate the oil temperature. Common failure modes include an open heating element, a stuck or drifting thermostat, or a leak at the hydraulic connections – any of which prevents the burner from firing cleanly on heavy oil. When replacing a preheater of this class, verify that the electrical ratings match the burner circuit and that the thread pattern on the oil ports is compatible with the existing pipework. Also check whether the original unit had a built‑in temperature sensor or relied on an external control; the replacement must provide the same control method to avoid erratic atomisation. The FPHB5 designation indicates a specific mechanical configuration within Danfoss’s preheater range, so confirm that the mounting bracket and overall dimensions fit the burner chassis before installation.