FPHE-LE oil preheaters are special versions of the standard preheaters types FPHE 3 and 5 with built-in LE valve – a hydraulically operated diaphragm valve, which in combination with an LE-pump significantly reduces emissions during start and stop phases. The LE valve can also be used as a safety shut-off valve in accordance with DIN EN ISO 23553-1. FPHE-LE are designed for oil burners with capacity up to 6 kg/h using standard fuel oil with viscosity up to 10 cSt. They are available with different heating elements and thermostats for selection of release time and temperature.