E.C.A Arceus EK 12, ST Electric System Boiler – 12kW

E.C.A Arceus EK 12, ST Electric System Boiler – 12kW (MPN: 8116284010) is a compact, wall‑mounted electric system boiler designed for sealed central heating systems with an external indirect hot water cylinder. The ST (Storage Tank) configuration uses an internal 3‑way valve to control cylinder charging, maintaining stored domestic hot water temperature while providing quiet, zero‑emission electric heating for modern all‑electric homes.

Key Features

• 12kW electric system boiler – dedicated to central heating and cylinder charging; domestic hot water is supplied via a separate unvented or vented cylinder.
• Storage Tank (ST) design – integrated 3‑way valve diverts primary water to the cylinder coil whenever the cylinder thermostat calls for heat.
• 100% efficient at point of use – no flue or combustion, so all electrical energy is converted to useful heat on site.
• Range‑rateable output – central heating output can be reduced from the 11.9–12kW nominal rating to better match property heat load and improve effective efficiency.
• Smart modulator control – stages the electric elements to deliver smooth temperature control and avoid unnecessary cycling.
• OpenTherm compatible – supports OpenTherm smart thermostats for finer temperature control and potential energy savings.
• Low noise operation – around 38 dB sound level, making it suitable for installation in kitchens, cupboards and utility spaces.
• Economy / energy‑saving mode – selectable operating mode to reduce consumption when full comfort is not required.
• Built‑in frost protection – protects the boiler and primary circuit inside the unit during cold weather.
• Stainless heating tank with special‑alloy elements – durable tank‑type heat exchanger designed for long service life.

Performance & Applications

• Central heating output: nominal 11.9–12kW (around 40,600 BTU/h), suitable for well‑insulated small to medium properties (typically up to ~90–100 m², heat‑loss dependent).
• Domestic hot water: provided via an external hot water cylinder; the boiler maintains cylinder temperature rather than producing instantaneous DHW.
• ErP classification: space‑heating ErP class D; overall system label can improve when combined with appropriate controls and cylinder.
• Ideal applications: all‑electric homes, properties without gas, and projects pairing electric heating with PV, batteries and smart electricity tariffs.

Technical Highlights

• Manufacturer: E.C.A
• Model: Arceus EK 12, ST Electric System Boiler
• MPN: 8116284010
• GTIN / EAN‑13: 8682182001116
• Nominal CH output: 11.9–12kW
• Electrical supply: configurable for 230V single‑phase or 400V three‑phase (up to 15kW), subject to site design.
• Boiler type: sealed system boiler with integral pump, expansion components and 3‑way valve for cylinder control.
• Heat exchanger: stainless steel heating tank with special‑alloy electric elements.
• Controls: digital front control panel, Smart modulator, ECO/COMFORT modes, OpenTherm interface and fault diagnostics.
• Safety features: automatic bypass, 3‑bar safety valve, overheat protection, frost protection and system pressure monitoring.
• Dimensions (H x W x D): approx. 678 x 410 x 288 mm.
• Weight: around 27 kg (approximately 30 kg gross with packaging).
• Certifications: CE, WRAS and other regional conformity approvals.
• Typical warranty: 3 years, subject to correct installation, commissioning and registration.

Installation Notes

• Installation and commissioning should only be carried out by a suitably qualified engineer following the E.C.A installation manual and local electrical and plumbing regulations.
• Designed for sealed systems with an external cylinder; ensure adequate expansion vessel capacity, safety valve provision and appropriate system water treatment.
• Size the electrical supply, cabling and protective devices for the 12kW load and chosen supply type (single‑phase or three‑phase).
• Wire room thermostat, cylinder thermostat and OpenTherm controls according to the manufacturer’s schematics to achieve optimal comfort and efficiency.