Original: $3,396.30
-65%$3,396.30
$1,188.70The Story
The EHC 12kW SlimJim Electric Flow Boiler & 200L Indirect Cylinder Package (EHCSJ12/200IND) pairs EHC's space-saving SlimJim flow boiler with a 200-litre Neptune Indirect Unvented Stainless Steel Cylinder and a matched Heating & Hot Water Boiler Pack. It is designed as a compact, single-source solution for wet central heating and domestic hot water in properties without mains gas, particularly where cupboard space is limited.
Qualified Installation & Load Check Required
This boiler must be installed and electrically connected by a qualified electrician in accordance with BS7671. A load check must be carried out before installation, as the boiler draws 50.0A and the property's incoming supply may need upgrading. The supply must be protected at the meter position with a 30mA double-pole RCD (minimum 3mm contact separation) and a suitably rated MCB. A magnetic filter must be fitted to the return pipework before the circulation pump — omitting or failing to clean it annually may result in boiler or system failure and will affect warranty cover.
Space-Saving Flow Boiler Design
The SlimJim boiler measures just 912 x 203 x 172mm and weighs around 11kg, making it one of the most compact electric flow boilers in EHC's range — well suited to airing cupboards, utility cupboards, and other tight installation spaces where a traditional system boiler footprint won't fit.
Boiler Output Naming
This package uses EHC's confirmed 12kW SlimJim boiler (EHCSJIM12KW), matching the model code exactly.
Compact Flow Boiler Footprint
At 912 x 203 x 172mm, the SlimJim is designed to maximise cupboard space compared with bulkier system boiler designs, while remaining fully controllable via its front panel.
Three-Stage Output Control
On-board dip switches allow the boiler's rated output to be staged down on site, giving some flexibility to match the installed heat load without needing a different chassis.
High-Current Safety Cut-Out
A dedicated WT3 safety thermal cut-out disconnects the boiler if the internal temperature reaches approximately 100°C, protecting the heat exchanger from failure.
Indirect Coil for Faster DHW Recovery
The 200L Neptune Indirect cylinder is heated primarily via its coil from the boiler's primary circuit, giving quicker reheat than a direct (immersion-only) equivalent.
Complete Heating & Hot Water Boiler Pack
The package includes a 24/7 programmer, room thermostat, twin 2-port zone valves and wiring centre, high-efficiency circulating pump, lockshield pump valves, dual cylinder thermostat, 8-litre expansion/sealed system kit, auto air vent, magnetic filter, and automatic by-pass.
No Flue, No Combustion Byproducts
As a fully electric flow boiler, the SlimJim requires no flue, no gas supply, and no annual gas safety check, simplifying installation versus a fossil-fuel system boiler.
| Boiler — 12kW SlimJim (General) | |
| Model / MPN | EHCSJ12/200IND |
| Boiler chassis | SlimJim Electric Flow Boiler |
| Boiler dimensions (H x W x D) | 912 x 203 x 172mm |
| Boiler weight | ≈11kg |
| Boiler connections | 22mm compression (flow top, return bottom) |
| Safety class | IP22 |
| Outflow water temperature range | 30 – 80°C |
| Max. water temperature | 100°C |
| Overheat protection cut-out | 100°C |
| Max. system pressure | 3 bar |
| Min. system pressure | 0.5 bar |
| Boiler — 12kW SlimJim (Electrical) | |
| Electrical supply | 240V 1ph 50Hz |
| Load current | 50.0A |
| Minimum permitted cable diameter* | 10mm² |
| Recommended protection (MCB) | 63A |
| Max. allowed network impedance | 0.24Ω |
| Heat output | 40,946 BTU/h |
| ErP rating | D |
| Cylinder — 200L Neptune Indirect | |
| Cylinder capacity | 200 litres |
| Cased height | 1120mm |
| Cased diameter | 580mm |
| Construction | Duplex stainless steel, TIG welded |
| Factory pressure test | 15 bar |
| Insulation | CFC- and HCFC-free polyurethane foam |
| Regulatory status | Controlled service – England & Wales Building Reg. G3 / Scotland Technical Standard P3 / N. Ireland Building Reg. Part F |
| Max. inlet mains water pressure | 12 bar |
| Operating pressure | 3.0 bar |
| Expansion vessel charge pressure | 3.0 bar |
| Expansion valve opening pressure | 6.0 bar |
| Max. operating pressure | 7.0 bar |
| T&P relief valve opening | 7.0 bar |
| Immersion element | 3kW, 240V, Incoloy |
| Immersion electrical supply | Dedicated 240V circuit, fused per element |
| Boiler Pack (Heating & Hot Water) — Included Components | |
| Controls | 24/7 programmer, room thermostat, dual cylinder thermostat |
| Valves | Twin 2-port zone valves, wiring centre |
| Circulation | High-efficiency circulating pump, lockshield pump valves |
| Protection | Magnetic filter, automatic by-pass |
| System kit | 8-litre expansion (sealed system) kit, auto air vent |
| Warranty | |
| Boiler warranty | 2 years parts & labour, subject to registration and annual servicing |
| Cylinder warranty | 2 years parts & labour from commissioning, subject to registration |
| Stainless steel inner vessel | 25-year guarantee (domestic installations) |
*Minimum permitted cable size; actual installation cable size must be calculated by a qualified electrician per BS7671, accounting for cable type and installation method.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
The EHC 12kW SlimJim Electric Flow Boiler & 200L Indirect Cylinder Package (EHCSJ12/200IND) pairs EHC's space-saving SlimJim flow boiler with a 200-litre Neptune Indirect Unvented Stainless Steel Cylinder and a matched Heating & Hot Water Boiler Pack. It is designed as a compact, single-source solution for wet central heating and domestic hot water in properties without mains gas, particularly where cupboard space is limited.
Qualified Installation & Load Check Required
This boiler must be installed and electrically connected by a qualified electrician in accordance with BS7671. A load check must be carried out before installation, as the boiler draws 50.0A and the property's incoming supply may need upgrading. The supply must be protected at the meter position with a 30mA double-pole RCD (minimum 3mm contact separation) and a suitably rated MCB. A magnetic filter must be fitted to the return pipework before the circulation pump — omitting or failing to clean it annually may result in boiler or system failure and will affect warranty cover.
Space-Saving Flow Boiler Design
The SlimJim boiler measures just 912 x 203 x 172mm and weighs around 11kg, making it one of the most compact electric flow boilers in EHC's range — well suited to airing cupboards, utility cupboards, and other tight installation spaces where a traditional system boiler footprint won't fit.
Boiler Output Naming
This package uses EHC's confirmed 12kW SlimJim boiler (EHCSJIM12KW), matching the model code exactly.
Compact Flow Boiler Footprint
At 912 x 203 x 172mm, the SlimJim is designed to maximise cupboard space compared with bulkier system boiler designs, while remaining fully controllable via its front panel.
Three-Stage Output Control
On-board dip switches allow the boiler's rated output to be staged down on site, giving some flexibility to match the installed heat load without needing a different chassis.
High-Current Safety Cut-Out
A dedicated WT3 safety thermal cut-out disconnects the boiler if the internal temperature reaches approximately 100°C, protecting the heat exchanger from failure.
Indirect Coil for Faster DHW Recovery
The 200L Neptune Indirect cylinder is heated primarily via its coil from the boiler's primary circuit, giving quicker reheat than a direct (immersion-only) equivalent.
Complete Heating & Hot Water Boiler Pack
The package includes a 24/7 programmer, room thermostat, twin 2-port zone valves and wiring centre, high-efficiency circulating pump, lockshield pump valves, dual cylinder thermostat, 8-litre expansion/sealed system kit, auto air vent, magnetic filter, and automatic by-pass.
No Flue, No Combustion Byproducts
As a fully electric flow boiler, the SlimJim requires no flue, no gas supply, and no annual gas safety check, simplifying installation versus a fossil-fuel system boiler.
| Boiler — 12kW SlimJim (General) | |
| Model / MPN | EHCSJ12/200IND |
| Boiler chassis | SlimJim Electric Flow Boiler |
| Boiler dimensions (H x W x D) | 912 x 203 x 172mm |
| Boiler weight | ≈11kg |
| Boiler connections | 22mm compression (flow top, return bottom) |
| Safety class | IP22 |
| Outflow water temperature range | 30 – 80°C |
| Max. water temperature | 100°C |
| Overheat protection cut-out | 100°C |
| Max. system pressure | 3 bar |
| Min. system pressure | 0.5 bar |
| Boiler — 12kW SlimJim (Electrical) | |
| Electrical supply | 240V 1ph 50Hz |
| Load current | 50.0A |
| Minimum permitted cable diameter* | 10mm² |
| Recommended protection (MCB) | 63A |
| Max. allowed network impedance | 0.24Ω |
| Heat output | 40,946 BTU/h |
| ErP rating | D |
| Cylinder — 200L Neptune Indirect | |
| Cylinder capacity | 200 litres |
| Cased height | 1120mm |
| Cased diameter | 580mm |
| Construction | Duplex stainless steel, TIG welded |
| Factory pressure test | 15 bar |
| Insulation | CFC- and HCFC-free polyurethane foam |
| Regulatory status | Controlled service – England & Wales Building Reg. G3 / Scotland Technical Standard P3 / N. Ireland Building Reg. Part F |
| Max. inlet mains water pressure | 12 bar |
| Operating pressure | 3.0 bar |
| Expansion vessel charge pressure | 3.0 bar |
| Expansion valve opening pressure | 6.0 bar |
| Max. operating pressure | 7.0 bar |
| T&P relief valve opening | 7.0 bar |
| Immersion element | 3kW, 240V, Incoloy |
| Immersion electrical supply | Dedicated 240V circuit, fused per element |
| Boiler Pack (Heating & Hot Water) — Included Components | |
| Controls | 24/7 programmer, room thermostat, dual cylinder thermostat |
| Valves | Twin 2-port zone valves, wiring centre |
| Circulation | High-efficiency circulating pump, lockshield pump valves |
| Protection | Magnetic filter, automatic by-pass |
| System kit | 8-litre expansion (sealed system) kit, auto air vent |
| Warranty | |
| Boiler warranty | 2 years parts & labour, subject to registration and annual servicing |
| Cylinder warranty | 2 years parts & labour from commissioning, subject to registration |
| Stainless steel inner vessel | 25-year guarantee (domestic installations) |
*Minimum permitted cable size; actual installation cable size must be calculated by a qualified electrician per BS7671, accounting for cable type and installation method.
