CTC EcoZenith i255 L II Low Model Indoor Module
Low and quiet indoor module with 223 liter buffer volume, integrated touchscreen, copper flow-through loop and EnergyFlex for flexible docking.
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CTC EcoZenith i255 L II Low Model Indoor Module
Description
CTC EcoZenith i255 L II is developed for properties where room dimensions or ceiling height require a more space-efficient design. With a total height of 1654 mm, the module is easily integrated into basements, utility rooms or technical rooms without sacrificing functionality or volume. The unit is the central control point in the property's water-based system and can be docked with advantage against rock or ground heat pumps in the CTC EcoPart series or air and water heat pumps in the CTC EcoAir series. Thanks to the top-positioned 22 mm connections, the pipework is considerably simplified during installation.
Future-proof heat distribution with EnergyFlex
The built-in EnergyFlex concept provides full freedom of choice when selecting and expanding energy sources. The system easily handles future connections of, for example, solar heating, water-jacketed wood-burning stoves, wood-burning systems or swimming pool heating. When connected to rock heating and the CTC EcoComfort module, it is also possible to use cooling passive free cooling during the summer months.
Legionella-proof tap water technology and integrated peak heating
The hot water preparation is based on an efficient flow-through loop in comb-flange coppers. The design means that the tap water is produced instantaneously when tapped, which counteracts stagnant water volumes and ensures constantly fresh and hygienic hot tap water up to 65 °C. The built-in buffer tank holds 223 liters and has a stabilizing effect on the system flow. This gives the connected compressor favorable operating conditions with few starts and stops, while reducing the risk of temperature spikes in pipes and radiators. Inside the chassis there is also a step-controlled electric immersion heater of 15 kW (with a capacity of up to 18 kW at 3x400V) for reliable peak and reserve heat as well as a built-in shunt valve, power monitor and circulation equipment.
Intelligent control via touchscreen and myUplink
The module is navigated via a clear 4.3-inch color touchscreen with intuitive menus and multilingual support. The integrated network connection enables remote monitoring and adjustment via the myUplink app on a smartphone or tablet. The control is prepared for voice control with Alexa and Google Home and compatible with SmartGrid for optimization against varying electricity prices.
Technical data
- Model designation: CTC EcoZenith i255 L II (Low model)
- Type: Indoor module and controllable electric boiler for heat pump
- Tank volume: 223 liters
- Dimensions (Width x Depth x Height): 596 x 673 x 1654 mm
- Pipe connection: 22 mm, placed upwards
- Preparation method: Flow-through coil in comb flange cups
- Maximum operating pressure and temperature: 3 bar / 100 °C
- Electrical output: 15 kW (step-controlled, max electrical data 15 to 18 kW, 3x400V 50Hz)
- Protection class: IP X1
- Standards met: EN 12102, EN 14825, EN 16154
- Energy efficiency: Space heating A++, Domestic hot water B
- System compatibility: CTC EcoAir and CTC EcoPart and CTC EcoComfort
Please note that the manufacturer’s full warranty is not applicable for units bought in Sweden and installed outside Sweden.

