Joule Kodiak Indirect Standard High Gain Pre Plumbed Cylinder Cylinder – 300L (HUKH-G6300-L3C) is a 300 litre tall, indirect, unvented, high-gain pre-plumbed hot water cylinder from Joule’s Kodiak Generation 6 range. It is supplied factory-assembled with an integrated hydraulic and zoning pack to simplify installation with modern heat pump and low-temperature heating systems.

Product Overview

• 300 litre indirect unvented pre plumbed cylinder in the “Standard” tall configuration, suitable for medium to large properties with higher hot water demand.
• Pre-plumbed “Kodiak” package with pipework, valves and hydraulic components built onto the front of the cylinder to minimise on-site labour.
• High-gain primary coil optimised for low-temperature heat sources such as air source heat pumps, providing fast heat-up and efficient operation.
• Designed as a complete hot water and distribution solution, ready to connect to the heat pump, heating circuits and mains water supplies.

Key Features

• Generation 6 high-gain coil – large-surface-area indirect coil designed to maximise heat transfer at lower flow temperatures, improving recovery times with heat pumps.
• Pre-plumbed and pre-wired layout – factory-assembled pipework, motorised valves, circulation pump and ancillary fittings reduce installation time and errors.
• Integrated 3-zone arrangement – configured to serve multiple heating zones and domestic hot water from a single packaged unit (typically radiators, underfloor and cylinder load).
• High-efficiency insulation – thick polyurethane foam insulation and steel outer case to minimise standing heat losses and improve system efficiency.
• Stainless steel pre plumbed cylinder construction – corrosion-resistant inner vessel with long design life and extended shell warranty (subject to terms and correct installation).
• Factory-fitted immersion heater – electric backup / boost immersion (around 3 kW) for emergency hot water, legionella pasteurisation or tariff-optimised operation.

Technical Highlights

• Model: HUKH-G6300-L3C – Kodiak Indirect Standard High Gain Pre Plumbed Cylinder, 300L.
• Nominal capacity: 300 litres (actual water volume slightly lower due to coil and fittings).
• Type: Indirect, unvented, high-gain, pre plumbed cylinder for use with external primary heat source (typically ASHP or boiler).
• Orientation: Vertical, tall “Standard” pattern.
• Working pressure: Typically 7 bar operating pressure with suitable unvented kit (expansion vessel, PRV, etc.).
• Primary coil: High-surface-area, high-gain stainless steel coil designed for low-temperature systems.
• Insulation: Rigid polyurethane foam with steel outer case in white/grey finish.
• Electrical: 230V 1-phase supply for immersion heater and controls (details depend on control pack specification).
• Approximate weights: Heavy-duty construction; significant weight when full, so suitable base and floor support are required.
• Warranty: Long-term pre plumbed cylinder shell warranty (often up to 25 years) with shorter cover on components, when installed and maintained to manufacturer’s instructions.

Integrated Hydraulic & Control Pack

• Pre-mounted circulating pump for the primary heating circuit, selected to suit low-temperature systems.
• Factory-fitted motorised valves for zone control (domestic hot water and multiple heating zones).
• Pre-plumbed distribution manifold / header to manage flows between zones and cylinder.
• Ancillary items such as automatic air vents, filling points, drain points and isolation valves to assist commissioning and servicing.
• Clean pipe layout on the cylinder face, providing clearly labelled connections for quick hook-up to the heat pump, system pipework and mains.

Typical Applications

• Air source heat pump installations in new-build or deep retrofit projects requiring a packaged hot water and zoning solution.
• Medium to large dwellings with multiple heating zones (e.g. underfloor and radiator circuits) and relatively high domestic hot water demand.
• Projects where reduced installation time, tidy plantroom appearance and manufacturer-optimised hydraulics are key design drivers.

Installation Notes

• Must be installed by a suitably qualified engineer holding unvented hot water certification, following current building regulations and manufacturer instructions.
• Requires a level, structurally sound base capable of supporting the full operating weight of the cylinder, water and pre-plumbed components.
• Provide sufficient clearance at the front and sides for pipe connections, electrical wiring, servicing and future maintenance.
• Connect to the dedicated unvented kit (expansion vessel, pressure reducing valve, safety valve set, tundish and discharge pipework) to the required standards.
• Commission in line with Joule’s procedures, including flushing, filling, setting controls, checking safety devices and recording benchmark documentation.