Electric boiler

BOSCH Tronic Heat 3500 Electric Boiler, 9 kW, Wall-Mounted

Ready-to-connect hydraulics with a built-in pump and a 7 l expansion vessel.

The BOSCH Tronic Heat 3500 electric boiler delivers 8.91 kW of heat output for radiator and underfloor systems in apartments, family homes and offices. It arrives complete with circulation pump, expansion vessel, safety valve and pressure sensor in a casing only 330 mm wide. Use it as the sole heat source or alongside a solid-fuel boiler, heat pump or solar system.

Three 3 kW power stages for smoother heating

The control electronics switch the heating elements in sequence and spread the load between them instead of stressing a single element. Modulation starts at around 3 kW, holding room temperature in mild weather without needless consumption.

Complete hydraulics included: pump, vessel, safety valve

The diaphragm expansion vessel holds 7 l and the boiler itself 3.7 l of water. The circulation pump is an energy-saving ErP model, so installation comes down to hanging the unit and connecting it to the system and the mains.

Graphic display and self-diagnostics in the controller

The button panel shows system status on screen, while the electronics monitor operation and report deviations. A room thermostat can be connected, and weather-compensated control by outdoor sensor is available.