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EHC 200L Compact All-in-One Electric System Boiler - Ultimate Package

The EHC Compact All-In-One Electric System Boiler — 200L Ultimate Package is a factory-assembled, fully electric heating and hot water system combining a 10kW, 12kW or 15kW electric system boiler with a 200-litre indirect unvented stainless steel cylinder on an 800×800mm footprint at 1,399mm tall. Supplied fully pre-plumbed and pre-wired with EHC Pro 4 magnetic filter, Adey MC1+ inhibitor and MC3+ cleaner, twin channel programmer, room thermostat and wiring centre. Suited to 3–4 bedroom homes with higher hot water demand. No flue, no gas supply, no annual gas safety check. 7–10 working day lead time. Free UK delivery.

10kW / 12kW / 15kW

Boiler Output Options

200L

Cylinder Capacity

1399mm

Height

Pre-Plumbed

Factory Assembled

Grundfos

Pump

No Flue

Fully Electric

Range Overview — All Compact All-In-One Sizes

Cylinder	Boiler Outputs	Height	Footprint	Filled Weight	Typical Home
150L	8kW / 10kW / 12kW / 15kW	1081mm	800×800mm	211 kg	1–2 bed flat / house
170L	10kW / 12kW / 15kW	1209mm	800×800mm	235 kg	2–3 bed home
200L	10kW / 12kW / 15kW	1399mm	800×800mm	265 kg	3–4 bed home
250L	12kW / 15kW	1711mm	800×800mm	320 kg	4–5 bed home
300L	12kW / 15kW	1930mm	800×800mm	375 kg	5+ bed home

All models: 800×800mm footprint. 7–10 working day lead time. Free UK delivery.

What's in the Ultimate Package

Electric System Boiler — 8kW / 10kW / 12kW or 15kW (6-stage modulating, stainless steel heat exchanger, Grundfos pump, expansion vessel, auto-bypass, auto-air vent, digital display)

Indirect Unvented Stainless Steel Cylinder — 150L / 170L / 200L / 250L or 300L (polyurethane insulated, 2× zone valves, combination valve, T&P relief valve, tundish, DHW expansion vessel — fully pre-plumbed)

EHC Pro 4 Magnetic Filter — Protects heat exchanger and pump from magnetite and debris

Adey MC1+ System Inhibitor — Corrosion inhibitor for long-term system protection

Adey MC3+ System Cleaner — Pre-commission flush cleaner to remove installation debris

Twin Channel Programmer — Independent scheduling for heating circuit and hot water cylinder

Room Thermostat — Hard-wired room thermostat for accurate ambient temperature control

Wiring Centre — Central wiring hub for fast, clean and safe electrical connections

Copper Press Fittings — Pre-fitted — secure, no-solder leak-free connections

Note: radiators, radiator valves and system pipework are not included. Installation must be carried out by a G3 competent person (for the unvented cylinder) and a qualified electrician (for all electrical connections).

⚠ Installation Requirements: The unvented cylinder must be installed by a G3 competent person. All electrical connections must be made by a qualified electrician. A dedicated radial circuit with a suitably rated MCB is required for the boiler element. Minimum clearance: 150mm above unit for lid access; 450mm for internal access. Not suitable for gravity-fed (tank) hot water systems.

Key Features

100% Electric — No Flue, No Gas Pipework, No Annual Gas Safety Check

The Compact All-In-One is a fully electric system. No flue penetration, no combustion, no Gas Safe registration for the boiler work. Suitable for any property regardless of gas availability — ideal for off-grid locations, new builds subject to the Future Homes Standard, and properties converting from gas. Electric boilers are 100% efficient at point of use — every unit of electricity drawn converts directly into heat.

No flue requiredNo gas supply needed100% efficient

Boiler Output Choice: 10kW / 12kW / 15kW — Match to Your Radiator Count

Available in 3 output options — 10kW / 12kW / 15kW. Rule of thumb: add 1.5 kW for each radiator in the home when calculating the required output. The 15kW option suits the largest properties in this cylinder's target range. The boiler uses 6-stage modulating output — it does not run at full power continuously, modulating down to reduce electricity consumption during lower demand periods.

10kW / 12kW / 15kW6-stage modulationMatch to rad count

Fully Pre-Plumbed and Pre-Wired — From Van to Done in Under 3 Hours

The Ultimate Package is supplied fully pre-plumbed and pre-wired. The cylinder arrives with zone valves, combination valve, T&P relief valve, tundish, DHW expansion vessel, wiring centre, programmer and room thermostat already connected and factory-assembled. EHC's headline claim is from van to done in under 3 hours for a qualified installer — significantly less than assembling and plumbing a boiler and cylinder separately.

Pre-plumbed + pre-wiredUnder 3 hours installUltimate Package

EHC Pro 4 Magnetic Filter — Protects the System From Day One

The EHC Pro 4 magnetic filter is included in the Ultimate Package — fitted inline to the system pipework to capture magnetite (iron oxide particles) and other ferrous debris before they reach the heat exchanger or Grundfos pump. Magnetite is the primary cause of premature pump failure and boiler heat exchanger blockage in electric and gas heating systems. Inclusion of the filter from the outset protects both the warranty and long-term performance.

EHC Pro 4 filterMagnetite removalProtects pump + HX

Adey MC1+ Inhibitor and MC3+ Cleaner — Professional System Treatment Included

The Ultimate Package includes both Adey MC1+ system inhibitor and Adey MC3+ system cleaner. MC3+ is used during commissioning to flush installation debris, flux residues and manufacturing oils from the new system. MC1+ is dosed into the system after flushing and provides long-term corrosion protection — a requirement of most boiler warranties. Having both chemicals in the package removes a common last-minute site sourcing issue.

Adey MC1+ inhibitorAdey MC3+ cleanerWarranty requirement

Twin Channel Programmer — Independent Heat and Hot Water Scheduling

The twin channel programmer controls the heating circuit and the hot water cylinder independently, allowing separate time schedules for each. In an S-plan configuration the homeowner can select heating only, hot water only, both, or neither — giving full control over energy use and comfort.

Twin channelS-plan readyIndependent heat + HW

Stainless Steel Unvented Cylinder with Polyurethane Insulation

The 200-litre indirect unvented cylinder is manufactured from stainless steel — corrosion-resistant and long-lasting. Polyurethane insulation minimises standing heat losses. Unvented design delivers mains-pressure hot water — suitable for power showers and modern high-flow fittings. Pre-fitted with 2× 22mm zone valves, combination valve, T&P relief valve, tundish and DHW expansion vessel.

Stainless steelMains pressure200L unvented

Grundfos Pump — Reliable Circulation, Quiet Operation

The system boiler incorporates a Grundfos circulation pump — the industry benchmark for reliability and efficiency in residential heating systems. Quiet operation makes it suitable for installations in kitchens, utility rooms and airing cupboards adjacent to living spaces.

Grundfos pumpQuiet operation

Built-In Diagnostics — Digital Display with Fault Code Readout

The system boiler features a digital display showing flow temperature, return temperature, system pressure and current kW output stage. The power stage indicator shows whether the boiler is operating at one-third, two-thirds or full output. In the event of a fault, diagnostic fault codes are displayed directly on the front panel — reducing call-out time for service engineers.

Digital displayLive kW stageFault codes

Technical Specifications

Package
SKU Codes	CAIO10/200IND-U, CAIO12/200IND-U, CAIO15/200IND-U
Cylinder Capacity	200 litres (indirect unvented)
Boiler Output Options	10kW / 12kW / 15kW
Boiler Type	Electric system boiler — 6-stage modulating
Physical Dimensions
Height	1399 mm
Width	800 mm
Depth	800 mm
Empty Weight (unit)	approx. 65 kg
Filled Weight (full installation)	approx. 265 kg
Boiler
Heat Exchanger	Stainless steel
Circulation Pump	Grundfos
Expansion Vessel	Built-in
Auto-Bypass	Built-in
Auto-Air Vent	Built-in
Temperature Range	20–85°C (adjustable)
Display	Digital — flow temp, return temp, pressure, kW stage, fault codes
Cylinder
Material	Stainless steel
Insulation	Polyurethane
Zone Valves	2 × 22mm (pre-fitted)
Combination Valve	Pre-fitted
T&P Relief Valve	Pre-fitted
DHW Expansion Vessel	Pre-fitted
Tundish	Pre-fitted
Ultimate Package — Additional Inclusions
Magnetic Filter	EHC Pro 4
System Inhibitor	Adey MC1+
System Cleaner	Adey MC3+
Programmer	Twin channel (heat + hot water)
Room Thermostat	Included
Wiring Centre	Included
Supply
Electrical Supply	230V AC / single phase
Lead Time	7–10 working days from order
Delivery	Free UK delivery (pallet)

Frequently Asked Questions

What size home is the 200L version suitable for?

The 200L cylinder and boiler combination is sized for 3–4 bedroom homes with higher hot water demand — 8–10 radiators. As a rough sizing guide, add 1.5 kW per radiator to calculate the minimum boiler output required. Available boiler outputs for this cylinder: 10kW / 12kW / 15kW. For properties at the upper end of the range, select the higher kW option.

What is the difference between the Basic and Ultimate Package?

The Basic Package includes the pre-plumbed boiler and cylinder core with zone valves. The Ultimate Package adds: EHC Pro 4 magnetic filter, Adey MC1+ inhibitor and MC3+ cleaner, twin channel programmer, room thermostat and wiring centre. EHC's target for the Ultimate Package is installation in under 3 hours.

Does this require a gas supply or a flue?

No — the Compact All-In-One is a fully electric system. No gas supply, no flue penetration and no combustion. Suitable for any property with single-phase electricity. No annual gas safety inspection is required.

What electrical supply does it need?

The boiler requires a single-phase 230V AC supply. A dedicated radial circuit with a suitably rated MCB is required for the boiler element. The 15kW boiler draws approximately 65A at full output — consult a qualified electrician for the correct circuit design.

Is the cylinder WRAS approved and G3 compliant?

The unvented cylinder is installed in accordance with G3 Building Regulations, which require installation by a G3 competent person. The cylinder incorporates a combination valve, temperature and pressure relief valve and tundish as mandated by G3. Always confirm the current WRAS and G3 status with the manufacturer before specifying.

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