E.C.A Arceus EK 12, MT Electric Combi Boiler – 12kW is a compact, wall‑mounted electric combi boiler designed to provide central heating and instantaneous domestic hot water without the need for gas. The MT (Monothermic Type) design incorporates separate heating circuits within a stainless steel tank‑type heat exchanger, delivering quiet (around 38 dB), zero‑emission operation for modern homes and apartments.
Key Features
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12kW electric combi boiler – provides central heating and instantaneous domestic hot water in one compact appliance.
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MT monothermic design – dual water heating circuits inside a stainless steel tank heat exchanger for space heating and DHW.
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100% efficient at point of use – all electrical energy is converted into heat within the system, with no flue losses.
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Range‑rateable output – heating side can be range‑rated (e.g. from 12kW down to 6kW) to improve ErP rating and better match property demand.
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Staged electric elements – multiple resistors are switched in stages for simple, reliable modulation and load management.
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Very quiet operation – approximately 38 dB sound level, suitable for installation in utility rooms, cupboards or kitchens.
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WRAS‑approved – compliant for use on UK potable water systems.
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OpenTherm compatible – supports OpenTherm smart room thermostats, improving control and reducing energy use.
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Built‑in smart modulator – optimises element staging and temperature control for stable comfort and efficiency.
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Automatic filling loop & bypass – integrated components simplify installation and help protect the system and boiler.
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Frost protection & ECO modes – frost protection for the boiler and ECO/COMFORT modes on the domestic hot water circuit.
Performance & Application
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Heating output: 12kW nominal, suitable for well‑insulated small to medium properties (typical heated area up to ~90–100 m², load‑dependent).
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DHW performance: maximum domestic hot water flow rate around 7.0–7.4 litres per minute at 35°C temperature rise.
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ErP ratings: ErP D for space heating; ErP C for domestic hot water efficiency.
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Ideal for all‑electric homes – properties without a gas supply, flats, or projects pairing an electric boiler with renewables and smart tariffs.
Technical Highlights
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Manufacturer: E.C.A
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Model: Arceus EK 12, MT Electric Combi Boiler
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MPN: 8116270010
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Heat output: 12kW
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Supply: 230V single‑phase or 400V three‑phase (model range supports both; wiring to be configured to site supply)
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Boiler type: wall‑hung, dual‑circuit (central heating and DHW)
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Maximum hot water flow rate: approx. 7–7.4 l/min at 35°C ΔT
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Seasonal efficiency: ~36% seasonal (space heating) with D‑class ErP; water heating ErP class C
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Heat exchanger: stainless steel tank‑type with removable electric elements
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Controls: advanced LCD control panel, built‑in diagnostics, ECO/COMFORT modes, OpenTherm interface
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Safety: 3‑bar safety valve, automatic bypass, frost protection, overheat protection, pressure sensor and fault diagnostics
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Dimensions (H x W x D): approx. 678 x 410 x 288 mm
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Approx. weight: around 27–30 kg (dry)
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Approvals: CE, WRAS and other regional approvals (TSE, EAC, etc.)
Installation Notes
- Must be installed and commissioned by a competent, qualified engineer in accordance with the manufacturer’s installation manual and local wiring/plumbing regulations.
- Suitable for sealed central heating systems; ensure appropriate expansion vessel, safety valve and system treatment are provided.
- Electrical supply sizing, protective devices and cable selection must be calculated to suit the 12kW load and supply type (single‑phase or three‑phase).
- Pair with a suitable OpenTherm or on/off room thermostat and, where applicable, smart controls or tariffs for best running cost and comfort.
