Original: $1,781.82
-65%$1,781.82
$623.64The Story
The EHC Neptune 200L Indirect Unvented Stainless Steel Cylinder (NIND200L) is built to work with any external thermostatically controlled heat source — electric, gas, oil, or solid fuel — and includes a highly efficient 3kW Incoloy immersion heater as backup or secondary heating. Constructed from Duplex stainless steel for corrosion resistance, it is designed for fast, safe, mains-pressure hot water delivery even in properties with lower incoming water pressure.
Controlled Service — Competent Person Required
Unvented cylinders are a controlled service under Building Regulation G3 (England & Wales), Technical Standard P3 (Scotland), or Building Regulation Part F (Northern Ireland), and must only be installed and commissioned by a competent, G3-qualified installer. The commissioning record must be completed and left with the householder for future reference.
Works With Any Compatible Heat Source
The indirect coil is designed to connect to any external thermostatically controlled boiler — electric, gas, oil, LPG, or solid fuel — making this cylinder a flexible choice where the heat source may be upgraded or changed independently of the hot water storage in future.
Model-Specific Performance Data Not Published
EHC's current Neptune technical documentation confirms this cylinder's capacity (200L) and cased dimensions (1120mm height x 580mm diameter), but does not publish model-specific coil surface area, heat-up time, or empty/full weight for this exact 200L SKU. Please contact EHC directly or request the current data sheet before specifying if these figures are required for a design calculation.
Duplex Stainless Steel Construction
The inner vessel is TIG welded from Duplex stainless steel and factory pressure-tested to 15 bar, giving strong corrosion resistance for long service life.
Faster Reheat Than Direct
As an indirect cylinder heated via a boiler-connected coil, recovery is markedly quicker than an equivalent-size direct (immersion-only) cylinder.
High-Performance in Low-Pressure Areas
Factory pre-adjusted controls are selected to combine high flow-rate performance with minimum pressure drop, helping the cylinder perform well even where incoming mains pressure is poor.
Backup Immersion Heating
The 3kW Incoloy immersion element provides independent electric water heating, useful during boiler servicing or as a secondary/emergency heat source.
Environmentally-Friendly Insulation
CFC- and HCFC-free polyurethane foam insulation reduces standing heat loss while avoiding ozone-depleting refrigerant gases in manufacture.
Rust-Resistant Steel Casing
The outer case is manufactured from rust-resistant steel, protecting the insulated inner vessel from external corrosion in typical domestic plant room or cupboard environments.
| Cylinder — Dimensions & Capacity | |
| Model / MPN | NIND200L |
| Cylinder capacity | 200 litres |
| Cased height | 1120mm |
| Cased diameter | 580mm |
| Cylinder — Construction | |
| 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 |
| Cylinder — Pressure Specifications | |
| 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 |
| Cylinder — Immersion Heater | |
| Immersion element | 3kW, 240V, Incoloy |
| Immersion electrical supply | Dedicated 240V circuit, fused per element |
| Warranty | |
| Cylinder warranty | 2 years parts & labour from commissioning, subject to registration |
| Stainless steel inner vessel | 25-year guarantee (domestic installations) |
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
The EHC Neptune 200L Indirect Unvented Stainless Steel Cylinder (NIND200L) is built to work with any external thermostatically controlled heat source — electric, gas, oil, or solid fuel — and includes a highly efficient 3kW Incoloy immersion heater as backup or secondary heating. Constructed from Duplex stainless steel for corrosion resistance, it is designed for fast, safe, mains-pressure hot water delivery even in properties with lower incoming water pressure.
Controlled Service — Competent Person Required
Unvented cylinders are a controlled service under Building Regulation G3 (England & Wales), Technical Standard P3 (Scotland), or Building Regulation Part F (Northern Ireland), and must only be installed and commissioned by a competent, G3-qualified installer. The commissioning record must be completed and left with the householder for future reference.
Works With Any Compatible Heat Source
The indirect coil is designed to connect to any external thermostatically controlled boiler — electric, gas, oil, LPG, or solid fuel — making this cylinder a flexible choice where the heat source may be upgraded or changed independently of the hot water storage in future.
Model-Specific Performance Data Not Published
EHC's current Neptune technical documentation confirms this cylinder's capacity (200L) and cased dimensions (1120mm height x 580mm diameter), but does not publish model-specific coil surface area, heat-up time, or empty/full weight for this exact 200L SKU. Please contact EHC directly or request the current data sheet before specifying if these figures are required for a design calculation.
Duplex Stainless Steel Construction
The inner vessel is TIG welded from Duplex stainless steel and factory pressure-tested to 15 bar, giving strong corrosion resistance for long service life.
Faster Reheat Than Direct
As an indirect cylinder heated via a boiler-connected coil, recovery is markedly quicker than an equivalent-size direct (immersion-only) cylinder.
High-Performance in Low-Pressure Areas
Factory pre-adjusted controls are selected to combine high flow-rate performance with minimum pressure drop, helping the cylinder perform well even where incoming mains pressure is poor.
Backup Immersion Heating
The 3kW Incoloy immersion element provides independent electric water heating, useful during boiler servicing or as a secondary/emergency heat source.
Environmentally-Friendly Insulation
CFC- and HCFC-free polyurethane foam insulation reduces standing heat loss while avoiding ozone-depleting refrigerant gases in manufacture.
Rust-Resistant Steel Casing
The outer case is manufactured from rust-resistant steel, protecting the insulated inner vessel from external corrosion in typical domestic plant room or cupboard environments.
| Cylinder — Dimensions & Capacity | |
| Model / MPN | NIND200L |
| Cylinder capacity | 200 litres |
| Cased height | 1120mm |
| Cased diameter | 580mm |
| Cylinder — Construction | |
| 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 |
| Cylinder — Pressure Specifications | |
| 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 |
| Cylinder — Immersion Heater | |
| Immersion element | 3kW, 240V, Incoloy |
| Immersion electrical supply | Dedicated 240V circuit, fused per element |
| Warranty | |
| Cylinder warranty | 2 years parts & labour from commissioning, subject to registration |
| Stainless steel inner vessel | 25-year guarantee (domestic installations) |
