E.C.A Arceus EK 15, ST Electric System Boiler – 15kW (MPN: 8116285010) is a compact, wall‑mounted electric system boiler for sealed central heating systems with an external indirect cylinder. The ST (Storage Tank) configuration combines space heating with control of a separate hot water storage cylinder via an internal 3‑way valve, keeping stored domestic hot water at the desired temperature while delivering quiet, zero‑emission electric heating.
Key Features
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15kW electric system boiler – provides central heating and controls an external hot water storage cylinder rather than producing instantaneous DHW.
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ST (Storage Tank) design – no internal plate heat exchanger; instead, an integrated 3‑way valve diverts primary water to the cylinder coil when cylinder temperature falls below setpoint.
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100% efficient at point of use – all electrical input is converted to heat on site, with no flue losses or combustion gases.
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Range‑rateable output – boiler output can be reduced (range‑rated) to better match system demand and improve ErP efficiency when configured correctly.
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Built‑in Smart modulator – manages staged electric elements and temperature control for smoother operation and energy saving.
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OpenTherm compatible – supports OpenTherm smart room thermostats, typically improving efficiency and comfort by 15–20%.
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Silent, compact operation – low noise level around 38 dB and small footprint make it suitable for cupboards, kitchens and utility rooms.
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Economy / energy‑saving mode – selectable operating modes for reduced energy consumption when full comfort is not required.
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Frost protection – integrated freeze protection for the boiler and system water within the unit.
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Stainless steel heating tank & special‑alloy elements – robust tank‑type heat exchanger with durable electric resistors for long life and reliability.
Performance & Applications
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Central heating output: approx. 14.9kW (around 50,840 BTU/h), suitable for well‑insulated small to medium homes (typical heated area up to ~110–120 m², load‑dependent).
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Domestic hot water: via external unvented or vented cylinder; boiler maintains cylinder temperature rather than producing instantaneous hot water.
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ErP classification: seasonal space heating ErP class D (typical for direct‑electric boilers of this type).
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Ideal for: all‑electric homes, properties without gas, and systems pairing electric heating with PV, batteries or low‑carbon tariffs, where a separate cylinder is preferred.
Technical Highlights
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Manufacturer: E.C.A
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Model: Arceus EK 15, ST Electric System Boiler
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MPN: 8116285010
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GTIN / EAN‑13: 8682182001123
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Nominal output (CH): approx. 14.9–15kW
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Supply options: 400V three‑phase or 230V single‑phase up to 15kW (configured to suit site supply and electrical design)
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Boiler type: sealed system boiler with internal expansion vessel, pump and 3‑way valve for cylinder control
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Heat exchanger: stainless steel storage‑type heating tank with special‑alloy electric elements
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Controls: digital control panel with LCD display, Smart modulator, OpenTherm interface, economy mode and diagnostics
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Safety features: automatic bypass, 3‑bar safety valve, frost protection, overheat protection, pump protection and fault diagnostics
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Dimensions (H x W x D): approx. 678 x 410 x 288 mm
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Weight: approx. 27 kg (around 30 kg gross with packaging)
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Warranty: typically 3 years, subject to manufacturer terms and correct installation/commissioning
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Approvals: CE, WRAS and other regional conformity certificates.
Installation Notes
- Must be installed and commissioned by a suitably qualified engineer in line with E.C.A installation instructions and local electrical and plumbing regulations.
- Designed for sealed central heating systems with an external cylinder; ensure appropriate expansion vessel volume, safety valve and system treatment are provided where required.
- Electrical supply, cabling and protective devices must be sized correctly for the 15kW load and chosen supply (single‑phase or three‑phase).
- Connect the boiler’s cylinder control and 3‑way valve ports as per the manufacturer’s schematics, and pair with an appropriate room thermostat and cylinder thermostat for optimal control.
