Compact hot water boilers ZVB II are intended for burning with wood pellets. They are intended for hot water heating (radiator, floor, fan coil…) from the smallest to medium-sized buildings. They are of steel construction, modern design and high efficiency. The boilers are equipped with a burner for burning wood pellets with an automatic ignition function and turbulators with manual cleaning. The digital boiler regulation with a 7″ touch-sensitive screen controls the operation of the boiler via the flue gas fan controlled by the smoke and boiler water temperatures. The boiler regulation, in addition to the boiler, can control one mixing or direct heating circuit and one sanitary water circuit with recirculation, i.e. a maximum of 3 pumps and one mixing valve. It is also possible to expand the heating circuits with a built-in pump, safety valve, and expansion tank. It is possible to order a fuel level sensor, an additional larger tank with a conveyor belt that automatically replenishes the tank in the boiler, a module for additional heating circuits and room correctors or thermostats.