The Story
The EHC 200L Pre-Plumbed Indirect Unvented Cylinder (NIND200PPC) is a Neptune-range Duplex stainless steel cylinder supplied with its controls, valves, and pump pre-fitted and pre-wired at the factory, cutting on-site plumbing and wiring time versus a standard indirect cylinder. It is heated via an external boiler's primary circuit through an internal coil, with a 3kW Incoloy immersion heater fitted as backup or secondary heat source.
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.
Factory Pre-Plumbed for Faster Installation
This cylinder ships with its automatic by-pass, wiring centre, combination valve, temperature and pressure relief valve, tundish, twin 2-port zone valves, filling loop, and high-efficiency circulating pump already fitted and pre-wired at the factory, so the majority of on-site plumbing and control wiring is eliminated — EHC estimate this can cut installation time on the cylinder side by up to 70% compared with a standard (non-pre-plumbed) indirect cylinder.
Model-Specific Performance Data Not Published
EHC's current Neptune technical documentation confirms this cylinder's capacity (200L) and cased dimensions (1120mm height x 710mm diameter), but does not publish model-specific coil surface area, heat-up time, or empty/full weight figures for this exact 200L pre-plumbed SKU. Please contact EHC directly or request the current data sheet before specifying if these figures are required for a design calculation.
Pre-Wired Controls
The wiring centre, zone valves, and pump are pre-connected at the factory, reducing the number of on-site electrical terminations an installer needs to make.
Faster Reheat Than Direct
As an indirect cylinder heated via the boiler's primary coil, recovery is markedly quicker than an equivalent-size direct (immersion-only) cylinder.
Twin Zone Valve Control
The integrated twin 2-port zone valve arrangement allows independent switching of heating and hot water circuits from a single pre-plumbed manifold.
Backup Immersion Heating
The 3kW Incoloy immersion element provides electric water heating independent of the boiler circuit, useful during boiler servicing or as a secondary heat source.
Duplex Stainless Steel Build
The inner vessel is manufactured from Duplex stainless steel, TIG welded and factory pressure-tested to 15 bar for corrosion resistance and long service life.
Filling Loop Included
A factory-fitted filling loop simplifies initial pressurisation and top-up of the primary heating circuit without additional site-sourced parts.
| Cylinder — Dimensions & Capacity | |
| Model / MPN | NIND200PPC |
| Cylinder capacity | 200 litres |
| Cased height | 1120mm |
| Cased diameter | 710mm |
| 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 |
| Pre-Plumbed Pack — Included Components | |
| Controls | Pre-wired wiring centre |
| Valves | Combination valve, twin 2-port zone valves |
| Safety | Temperature & pressure relief valve, tundish |
| Circulation | High-efficiency circulating pump |
| Fill/vent | Filling loop, automatic by-pass |
| Warranty | |
| Cylinder warranty | 2 years parts & labour from commissioning, subject to registration |
| Stainless steel inner vessel | 25-year guarantee (domestic installations) |
Description
The EHC 200L Pre-Plumbed Indirect Unvented Cylinder (NIND200PPC) is a Neptune-range Duplex stainless steel cylinder supplied with its controls, valves, and pump pre-fitted and pre-wired at the factory, cutting on-site plumbing and wiring time versus a standard indirect cylinder. It is heated via an external boiler's primary circuit through an internal coil, with a 3kW Incoloy immersion heater fitted as backup or secondary heat source.
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.
Factory Pre-Plumbed for Faster Installation
This cylinder ships with its automatic by-pass, wiring centre, combination valve, temperature and pressure relief valve, tundish, twin 2-port zone valves, filling loop, and high-efficiency circulating pump already fitted and pre-wired at the factory, so the majority of on-site plumbing and control wiring is eliminated — EHC estimate this can cut installation time on the cylinder side by up to 70% compared with a standard (non-pre-plumbed) indirect cylinder.
Model-Specific Performance Data Not Published
EHC's current Neptune technical documentation confirms this cylinder's capacity (200L) and cased dimensions (1120mm height x 710mm diameter), but does not publish model-specific coil surface area, heat-up time, or empty/full weight figures for this exact 200L pre-plumbed SKU. Please contact EHC directly or request the current data sheet before specifying if these figures are required for a design calculation.
Pre-Wired Controls
The wiring centre, zone valves, and pump are pre-connected at the factory, reducing the number of on-site electrical terminations an installer needs to make.
Faster Reheat Than Direct
As an indirect cylinder heated via the boiler's primary coil, recovery is markedly quicker than an equivalent-size direct (immersion-only) cylinder.
Twin Zone Valve Control
The integrated twin 2-port zone valve arrangement allows independent switching of heating and hot water circuits from a single pre-plumbed manifold.
Backup Immersion Heating
The 3kW Incoloy immersion element provides electric water heating independent of the boiler circuit, useful during boiler servicing or as a secondary heat source.
Duplex Stainless Steel Build
The inner vessel is manufactured from Duplex stainless steel, TIG welded and factory pressure-tested to 15 bar for corrosion resistance and long service life.
Filling Loop Included
A factory-fitted filling loop simplifies initial pressurisation and top-up of the primary heating circuit without additional site-sourced parts.
| Cylinder — Dimensions & Capacity | |
| Model / MPN | NIND200PPC |
| Cylinder capacity | 200 litres |
| Cased height | 1120mm |
| Cased diameter | 710mm |
| 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 |
| Pre-Plumbed Pack — Included Components | |
| Controls | Pre-wired wiring centre |
| Valves | Combination valve, twin 2-port zone valves |
| Safety | Temperature & pressure relief valve, tundish |
| Circulation | High-efficiency circulating pump |
| Fill/vent | Filling loop, automatic by-pass |
| Warranty | |
| Cylinder warranty | 2 years parts & labour from commissioning, subject to registration |
| Stainless steel inner vessel | 25-year guarantee (domestic installations) |
