Heater thermostat K11 IU 018893

Heater control in indirect heating installations

The K11 IU thermostat is a control device designed by NIBE to work with tanks equipped with R-50 type electric heaters. In the context of ETIM, the product is classified as an accessory for boilers with indirect heating - it thus acts as a bridge between the indirect heat source (e.g., heat pump, boiler) and the electric domestic hot water heating support.

The maximum power of the supported heaters reaches 10,5 kW, making this thermostat suitable for both smaller residential installations and facilities with a higher hot water demand. The two-pole, two-stage thermostat enables smooth water temperature regulation in two ranges - the installer can configure it to activate the heater only when the main heat source is unable to provide sufficient temperature.

Over-temperature protection implemented by a three-pole temperature limiter protects the tank against overheating - this is crucial in systems where an automation failure could lead to dangerous situations.

Compatibility and system purpose

K11 IU is primarily dedicated to working with tanks equipped with NIBE R-50 heaters. The manufacturer specifies the RSK number 6952238, which facilitates the identification of compatible configurations when selecting accessories.

In practice, the thermostat proves effective in hybrid installations - where a heat pump or another indirect source serves as the main heat source, and the electric heater serves a backup or peak function. This type of solution allows for maintaining the desired DHW temperature even in extreme weather conditions, rapid water reheating during periods of increased consumption, and reducing waiting time for hot water in large multi-family systems.

Operating parameters and safety

The maximum power of the supported devices is 10 500 W. The operating thermostat has a two-pole and two-stage design - each stage engages a separate pair of contacts, ensuring greater reliability at loads of several kilowatts. Regardless of the user settings, a three-pole temperature limiter operates, which breaks the circuit if the operating temperature exceeds the permissible value. Power supply and electrical parameters comply with the specification defined by NIBE for this type of device.

Installation and integration

The K11 IU thermostat is mounted directly on the tank or near it - the installation method depends on the configuration of the specific DHW tank model. The manufacturer recommends that the connection be performed by a person with appropriate electrical qualifications, taking into account the contact rating at power levels up to 10,5 kW.

The device is part of the NIBE control ecosystem - its operating parameters can be monitored and configured within a broader building energy management system, which will be appreciated by installers working with heat pumps of this brand.