The new generation of Zehnder immersion heaters

It’s Zehnder’s latest electric heating solution, available in three product lines tailored to different needs: IHD (Design & Control), IHC (Control & Ease of use), and IHE (Plug & Play Easy).

They feature smart control options (app, remote, rotary dial), safe surface temperature limitation for your safety, high energy efficiency for your budget, and a discreet design with colour-matched components for your perfect bath design.

Control options include the Zehnder Connect App, Remote Control Easy (RCE), or integrated rotary dial/timer, depending on the product line.

Need help? You can find here the Connect App for Android  and iOS.

Comfort mode: 7 to 28 °C (default setting: 21 °C)
Eco mode: 7 to 19 °C (default setting: 16 °C)
Timer: 5 min up to 240 min (default 60 min)
Frost protection mode: 7 °C (fixed value)

Note: Available in the product line IHC and IHD

Hotel Mode (IHC) enables pre-configured timers, restricted surface temperature settings, and limited user interaction – ideal for hospitality environments.

Note: mode available in the product line IHC

Yes, the Zehnder Connect App provides detailed energy usage statistics – daily, monthly, and yearly

Note: feature available in the product line IHD

Yes, multiple heaters can be linked via Remote Control Easy (RCE) or the Connect Box to synchronise settings and modes

Note: feature available in the product line IHC and IHD

Activate Timer mode – default duration is 60 minutes but can be adjusted in range between 5 minutes and 240 minutes for faster towel drying.

Note: feature available in the product line IHC and IHD

After a power outage, the heater automatically resumes its last operating mode and temperature settings.

Note: behaviour depending on the product line

Yes, integration with Zehnder smart home system is possible via Connect-Box (for IHD & IHC), enabling remote control and cloud-based features. IHE can be integrated directly with power with simple power supply only.

Possible causes include:
• Target temperature set too low
• Eco mode is active
• Surface temperature limit is enabled
• Radiator size/power is insufficient for the room, and its energy loss level. 

Need help? Take a look at the product pages on our website to find technical guidance. 

To reset IHD or IHC to factory settings, press and hold the control button or rotary dial for approximately 10 seconds until 'RES' appears or the LED flashes white.

Dispose of the heater at an authorised electronic waste recycling centre. Do not discard it with regular household waste.

This feature automatically switches the heater to frost protection mode when a sudden drop in temperature is detected (e.g., due to an open window). This helps to avoid unnecessary heating and therefore contributes to energy saving. It can be enabled or disabled via the Connect App.

Note: available in the product line IHC and IHD

AUTO mode automatically switches the heater between comfort and eco modes based on a weekly schedule. Local changes are temporary; permanent changes must be made via the app.

Note: feature available in the product line IHC and IHD

Compatible only with Zehnder towel radiators or officially approved models. Installation must be carried out by a qualified technician.

Depending on the model, power ratings range from 200 W to 1200 W. Selection should match radiator size and room requirements.

All models include IP protection, Class II double insulation, and built-in overheat and frost protection mechanisms.

Surface temperature can be adjusted: IHC via service menu, IHD via Connect App. Default range is 80 °C, adjustable down to 65, 55 and 40 °C.

Note: feature available in the product line IHC and IHD

IHD: Pair the device with Remote Control Easy (RCE) or the Zehnder Connect App.
IHC: Automatically starts (as standalone) in Comfort mode (21 °C); Hotel mode can be activated via service settings; You can also pair the device with Remote Control Easy (RCE) or the Zehnder Connect App or use it standalone.

Error codes include (IHC, RCE products):
• E1: Connection lost
• E2: Room temperature sensor issue
• E4: Surface temperature sensor issue
• E5/E6: Internal hardware fault
Try resetting the device. If the issue persists, contact Zehnder service.

Need help? Find here the e-manuals with troubleshooting guidance on the product pages of our website. 

Avoid the following installation errors:
• Using non-approved radiators
• Operating the heater without water (dry operation)
• Incorrect electrical wiring
• Exceeding the maximum water pressure of 0.4 MPa

The Immersion Heater must be installed by a qualified technician according to local regulations. It must be fully immersed in water. The minimum internal diameter of the radiator collector is 27 mm, and its length should be at least 1.5× the length of the heater. The heater must be mounted vertically with the control unit at the bottom.

No. The immersion heater must be installed in a zone appropriate to its IP rating, in order to prevent risks related to water exposure and electrical hazards. Additionally, it must be powered via a dedicated circuit protected by a residual current device (RCD) with a maximum differential current of 30 mA, especially when installed in rooms containing a bathtub or shower. These requirements comply with IEC 60364-7-701, the international standard for electrical installations in wet zones.