EHC SlimJim Electric Flow Boiler 10kW

Description

The EHC SlimJim 10 kW electric flow boiler (EHCSJIM10KW) is a wall-mounted, single phase 240 V heat source for wet central heating. There is no gas supply, no flue and no combustion, and the insulated stainless steel heat exchanger turns electricity into heat at the point of use with 100% efficiency. At just 912 x 203 x 172 mm and 11 kg, it is designed to free up cupboard space in retrofits and new builds alike.

The 10 kW output suits medium-sized homes, with a load current of 41.7 A and 50 A protection. Size every installation from a heat loss calculation to BS EN 12831, and add 3 kW to the space heating figure if the boiler will also heat a hot water cylinder.

It runs on vented or sealed systems, suits underfloor heating, and can heat radiators only or work with an indirect cylinder on an S-plan layout. A run-dry water level sensor, high temperature cut-out and in-built fault diagnostics protect the boiler and make servicing quicker.

10 kW

Heat output

41.7 A

Load current

30-80°C

Flow temperature

11 kg

Weight

IP22

Protection rating

ErP D

Space heating class

Electrical safety and load check

Have a qualified electrician carry out a load check before installation; the incoming supply fuse may need upgrading, especially where other high power devices such as electric showers are present. Protect the boiler at the meter position with a 30 mA double pole RCD (minimum 3 mm contact separation) and a suitably rated MCB; the manufacturer recommends 50 A protection for this model. The appliance must be earthed, and an isolation switch must be fitted locally if the boiler is not next to the meter.

Pump, expansion vessel and filter are not built in

The SlimJim is a flow boiler. The system must include a circulation pump, pump valves, a magnetic filter on the return before the pump, an automatic bypass where required, and for sealed systems a sealed system kit with expansion vessel and automatic air vent. EHC offers matching control packs that supply most of these items, and they are listed separately.

Warranty wording differs between sources

EHC's product literature quotes 5 years (terms and conditions apply), while the printed installation manual states a 24 month warranty. Warranty cover depends on a fitted magnetic filter and a properly cleaned, flushed and inhibited system, so confirm the current terms with EHC when you register the boiler.

Key features

Compact and light

At 912 x 203 x 172 mm and 11 kg, the unit mounts on a wall using the supplied template and fits into tight airing cupboards and utility spaces.

100% efficient, six stage heating

Six stage heating matches electrical input to demand, while the fully insulated stainless steel heat exchanger minimises heat loss.

Built-in protection

A run-dry sensor guards the heat exchanger against water loss, a WT3 thermal cut-out cuts power at around 100°C, and a high current safety device protects the electrics.

Flexible control inputs

Choose volt-free or 240 V control signalling with a DIP switch, and limit the output in three power stages on site.

Easy servicing

A front control panel with four LED indicators shows power, firing, heat call and low water, and the easy-fit front cover gives quick access to the boards and sensors.

Versatile system fit

Heat only or heat plus hot water via S-plan with a cylinder, on vented or sealed circuits, including underfloor heating.

Installation essentials

1. Siting

Install the boiler upright on a wall with an adequate fixing. Allow 400 mm clearance at the front and 50 mm at each side. Never leave it off where the room can drop below 0°C; fit a frost stat.

2. Pipework

Flow (top, red) and return (bottom, blue) are 22 mm compression and must never be reversed. Remove the transit blanking plugs and avoid hot soldered joints at the boiler.

3. Open circuit

Because the water content is low, provide about 2 metres of continuous 22 mm pipe after the boiler connections before any S-plan zone valves.

4. Air vents

Fit an automatic air vent on sealed systems, positioned to the side, never directly above the boiler.

5. Isolation

Fit full bore lockshield isolation valves on flow and return. Ball valves reduce the recommended flow rate.

6. Flush and protect

Flush to within 10% of mains TDS, power flush existing systems, then add cleaner and inhibitor. Clean the magnetic filter annually.

SlimJim range at a glance

Output

Model

Load current

Protection

BTU/h

Max network impedance (Ω)

4 kW

EHCSJIM4KW

16.7 A

20 A

13,648

0.43

7 kW

EHCSJIM7KW

29.2 A

40 A

23,885

0.37

10 kW

EHCSJIM10KW

41.7 A

50 A

34,121

0.29

12 kW

EHCSJIM12KW

50.0 A

63 A

40,946

0.24

14.4 kW

EHCSJIM14.4KW

60.0 A

80 A

49,135

0.22

Technical specification

General

Model / MPN

EHCSJIM10KW

Boiler type

Electric flow boiler, wall mounted

Heat output

10 kW (34,121 BTU/h)

Dimensions (H x W x D)

912 x 203 x 172 mm

Weight

11 kg

Protection class

IP22

ErP rating

D

Hydraulic

Flow and return connections

22 mm compression (flow top, return bottom)

Flow temperature range

30 to 80°C

Maximum water temperature

100°C

Operating pressure

Minimum 0.5 bar, maximum 3 bar (set 1.0 to 1.5 bar working)

Heat exchanger

Insulated stainless steel

Electrical

Supply

240 V AC, single phase, 50 Hz

Load current

41.7 A

Recommended protection

50 A

Maximum permitted network impedance

0.29 Ω

Control input

Volt-free or 240 V, selected by DIP switch

Overheat protection

100°C thermal cut-out

Technical support

For product and installation questions, the manufacturer's technical helpline is 01698 820533. Have the model number and boiler serial number to hand when you call.

Frequently asked questions

Does the SlimJim have a pump and expansion vessel built in?

No. It is a flow boiler, so the circulation pump, pump valves, magnetic filter and, on sealed systems, the expansion vessel and sealed system kit are fitted to the system. The manufacturer's control packs bundle most of these.

Can it supply domestic hot water?

Yes, in an S-plan arrangement with an indirect cylinder, zone valves and cylinder thermostat. Add 3 kW to your space heating calculation, and have unvented cylinders installed by a G3-qualified installer.

What electrical supply does this model need?

A 240 V single phase supply with a load current of 41.7 A. The manufacturer recommends 50 A protection, a 30 mA double pole RCD and a cable sized by a qualified electrician to BS 7671. A load check is required, and the supply must not exceed 0.29 Ω network impedance.

Can I use it with underfloor heating?

Yes. The SlimJim range is suitable for wet underfloor heating circuits as well as radiators, and can run multi zone systems.

How do I control it?

Use any suitable programmer and room thermostat. For volt-free control remove the link from the RP connection and wire the controls there; for 240 V control leave the link and enable DIP switch 4. Room and cylinder thermostats are needed for Part L, and TRVs alone do not provide boiler interlock.

What do I need to do to keep the warranty valid?

Fit a magnetic filter on the return before the pump, flush and clean the system to BS 7593, add inhibitor, keep the boiler upright and have it installed by a competent person. Clean the filter and check inhibitor levels annually.

BTU Calculator

BTU & WATT Calculator

Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

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Required Heating

0

Watts

0

BTUs