The JAB DUC IE Compact Pre-Plumbed Indirect is an internal-expansion unvented hot water cylinder available in 200L, 250L, and 300L capacities, built from duplex stainless-steel with a 550mm diameter across the range. The heating side is supplied factory pre-plumbed with a twin-zone manifold, circulating pump, zone valves, filling loop, and expansion kit already fitted, cutting first-fix time on site. Domestic hot water is heated indirectly from a boiler or renewable heat source and backed up by a factory-fitted 3kW immersion heater. It is manufactured in the UK and WRAS approved.
550mm
Diameter (All Sizes)
1 x 3kW
Back-Up Immersion
19.94–23.57kW
Coil Rating Range
Pre-plumbed heating pack: the heating circuit on this cylinder is factory-assembled with a twin-zone manifold, circulating pump, zone valves, automatic bypass valve, filling loop, heating expansion vessel, and pressure gauge – the components typically supplied on a pre-plumbed indirect cylinder. Confirm the exact manifold configuration (e.g. system vs regular boiler compatibility) with your supplier for the specific installation.
Installer requirement: this is an unvented hot water cylinder and must be installed, commissioned, and notified to Building Control by a G3-qualified (Benchmark) installer in line with Building Regulations Part G3.
All electrical connections, including the twin-zone pump, zone valves, and back-up immersion heater, must be wired by a qualified electrician in accordance with BS 7671; actual cable sizing should be calculated on site rather than assumed from generic figures.
Why Choose the JAB DUC IE Compact Pre-Plumbed Indirect
Twin-Zone Pre-Plumbed Pack
Factory-fitted with a twin-zone heating manifold, this cylinder ships with the heating-side pipework, valves, and controls already assembled and pressure-tested, so the installer connects flow, return, and electrics rather than building the manifold on site.
Circulating Pump & Zone Valves Included
The pre-plumbed pack includes a heating circulating pump and twin 2-port zone valves for independent heating and hot water zones, along with an automatic bypass valve to protect the pump when zones are shut.
Filling Loop & Expansion Kit Fitted
A filling loop, heating expansion vessel, and pressure gauge are pre-fitted to the heating circuit, so the installer isn't sourcing and plumbing in these components separately on site.
Duplex Stainless-Steel Shell
The duplex stainless-steel body resists pitting and stress corrosion far better than standard 304-grade tanks, giving reliable long-term performance in hard-water areas.
Internal Expansion Design (Domestic Water)
Building the domestic hot water expansion volume inside the cylinder removes the need for a separate external expansion vessel on the cold-mains side, simplifying installation further.
Independent Immersion Back-Up
A factory-fitted 3kW immersion heater gives an independent electric back-up route to hot water if the primary heat source is ever down.
Sizes & Specification
| Capacity |
Height |
Coil Rating |
Standing Heat Loss |
ErP Band |
| 200L |
1425mm |
19.94kW |
1.70 kWh/24h |
C |
| 250L |
1725mm |
20.68kW |
1.99 kWh/24h |
C |
| 300L |
1950mm |
23.57kW |
2.26 kWh/24h |
C |
Technical Specification
| Construction |
| Cylinder Type |
Indirect, unvented, duplex stainless-steel, internal expansion |
| Diameter |
550mm (all sizes) |
| Manufacture |
Made in the UK |
| Approval |
WRAS approved |
| Max Flow Rate |
Up to 55 litres/min (minimum recommended supply 20 litres/min at 1.5 bar) |
| Pre-Plumbed Heating Pack |
| Manifold |
Twin-zone, factory-fitted |
| Circulating Pump |
Factory-fitted |
| Zone Valves |
Twin 2-port zone valves |
| Bypass |
Automatic bypass valve |
| Filling Loop |
Factory-fitted |
| Heating Expansion Vessel |
Factory-fitted |
| Pressure Gauge |
Factory-fitted |
| Domestic Hot Water Connections & Safety |
| Expansion (Domestic Water) |
Internal – no external expansion vessel required |
| Immersion Heater |
1 x 3kW, factory-fitted (back-up) |
| Heat Source |
Boiler or renewable heat source, via internal coil |
| Unvented Kit |
Full kit supplied |
| Warranty |
| Cylinder |
25 years, including 1 year on-site cover* |
Frequently Asked Questions
What does "Pre-Plumbed" include on this cylinder?
The heating side comes factory-assembled with a twin-zone manifold, circulating pump, twin 2-port zone valves, automatic bypass valve, filling loop, heating expansion vessel, and pressure gauge – the typical components fitted to a pre-plumbed indirect cylinder so the installer connects pipework and electrics rather than assembling the heating manifold on site.
What heat source does this cylinder use?
The internal coil is designed to be heated by a boiler or renewable heat source, with the factory-fitted 3kW immersion providing independent electric back-up for the domestic hot water.
Do I need an external expansion vessel for the domestic hot water?
No. The internal expansion design builds the domestic water expansion volume into the cylinder itself. A separate heating-side expansion vessel is included as part of the pre-plumbed pack for the sealed heating circuit.
Does this cylinder need to be installed by a qualified installer?
Yes. As an unvented hot water cylinder it must be installed, commissioned, and notified to Building Control by a G3-qualified (Benchmark) installer in line with Building Regulations Part G3.
How does the coil rating change across the range?
Coil output scales with capacity: 19.94kW at 200L, 20.68kW at 250L, and 23.57kW at 300L, per JAB's technical spec sheet for this range.
What warranty does this cylinder carry?
A 25-year warranty including one year on-site cover, per the manufacturer's published features; confirm current terms and registration with your supplier at the time of purchase.
