The nozzle assembly is optional on the 2-stage models. Quiet in operation. A soft pulsation free start. Wide adjustment range and high efficiency ensure lowest possible energy consumption. • Energy saving and compatible with environmental requirements • Quiet in operation and designed for easy maintenance • Reliable and trouble free • Suitable for High Resistance Boilers • Designed for on/off and 2-stage operation • Industry standard components easily available • Available with servo air adjustment • Plug-in contact facilitates the installation