Ideal Pro 300 L Indirect Unvented Cylinder

Description

The Ideal Pro 300L Indirect Unvented Cylinder (model IDEPROIN300) is a floor-standing mains-pressure hot water cylinder built for larger households with multiple bathrooms. Manufactured in the UK from high-grade stainless steel, it draws water directly from the mains supply to deliver strong, even hot water flow at every outlet, without the need for a loft-mounted cold water storage tank.

Designed for use with a gas, oil or LPG heat-only or system boiler, the cylinder is heated indirectly via an internal primary coil and is supplied as a complete package with all the safety and control components required for a Building Regulations Part G3 compliant installation, including two 3kW immersion heaters for independent top and bottom zone backup or off-peak electric heating.

287 L

Actual Capacity

3 bar

Max. Working Pressure

2 x 3 kW

Immersion Heaters

1990 mm

Height

550 mm

Diameter

25 Yrs

Cylinder Warranty

Key Features

Duplex Stainless Steel Vessel

The storage vessel is manufactured from high quality duplex stainless steel, offering strong resistance to corrosion without the need for a sacrificial anode.

Mains Pressure Hot Water

Being an unvented design, the cylinder takes its supply directly from the mains, giving strong, balanced flow at showers and taps without a header tank.

Indirect Coil Heating

An internal primary heating coil is heated by a connected gas, oil or LPG boiler, compatible with both sealed and open-vented (F&E) primary heating systems.

Twin 3kW Immersion Backup

This 300L model is fitted with two 3kW immersion heaters (top and bottom) for independent zone backup or off-peak electric heating, each with its own control and energy cut-out thermostats.

Complete Inlet Control Group

Supplied with a combination inlet valve incorporating pressure reduction, a check valve, strainer, balanced cold take-off and expansion relief, simplifying compliant installation.

25 Year Vessel Warranty

Backed by a 25 year warranty on the stainless steel vessel and a 2 year warranty on all other components, subject to registration and manufacturer's terms.

What's Included

Inlet Control Group

Cold water combination valve with pressure reducing valve, strainer, check valve, balanced cold take-off and expansion relief.

Pressure & Temperature Relief Valve

Combined safety valve set at 6 bar / 89–96°C to protect against excess pressure or temperature.

Control & Energy Cut-Out Thermostats

A control thermostat plus a separate energy cut-out (overheat) thermostat for the primary circuit.

Motorised 2-Port Zone Valve

Fitted to the primary (indirect) heating circuit for correct zone control with the boiler.

Expansion Vessel & Bracket

Wall-mountable expansion vessel to accommodate the expansion of heated water in the sealed unvented system.

Tundish, Drain Elbow & Literature

Includes a tundish and drain elbow for safe discharge and maintenance, plus full technical and user documentation.

Two 3kW Immersion Heaters

This 300L model is supplied with two 3kW immersion heaters, each including its own control and cut-out thermostats, for independent top/bottom zone electric heating.

Technical Specifications

General

Manufacturer

Ideal Heating

Model

Ideal Pro Indirect Unvented Cylinder

MPN / SKU

IDEPROIN300

EAN

5022142180599

Type

Indirect unvented, vertical floor-standing

Construction

Duplex stainless steel vessel

Country of Manufacture

United Kingdom

Capacity & Dimensions

Nominal Capacity

287 litres (see amber note above)

Height

1990 mm

Diameter

550 mm

Weight – Empty

43 kg

Weight – Full

330 kg

Secondary Return

Yes, 22 mm

Heating & Performance

Primary Heat Source

Gas, oil or LPG heat-only / system boiler (indirect coil)

Primary Coil Rating

Approx. 25 kW

Reheat / Heat-Up Time

Approx. 38 minutes, boiler output dependent

Immersion Heaters

2 x 3 kW, 230V single-phase, 1¾" BSP (top and bottom zone)

Compatible Primary Systems

Sealed (pressurised) or open-vented (F&E cistern)

Energy Efficiency Rating

C

Pressures & Safety

Max. Working Pressure

3 bar (via inlet control group)

Pressure & Temperature Relief Valve

6 bar / 89–96°C

Insulation

High-density HCFC-free foam, zero ODP

Building Regulations

Complies with Section G3 (England & Wales); Technical Standard P3 (Scotland); Building Regulation P5 (Northern Ireland)

Warranty

Cylinder Vessel

25 years, subject to registration and manufacturer's terms

Other Components

2 years parts and labour

Important Safety Information: This cylinder is not suitable for use with combi boilers, which do not use a separate storage cylinder, and must not be used with solid fuel boilers or where steam is the primary heating medium. It should be installed by a competent, qualified installer in accordance with the manufacturer's instructions and current Water Regulations.

Frequently Asked Questions

Is the Ideal Pro 300L cylinder suitable for my boiler?

It is designed for use with a gas, oil or LPG heat-only or system boiler supplying an indirect primary coil, and works with either sealed or open-vented (F&E) primary heating systems. It is not compatible with combi boilers, which do not use a storage cylinder.

Why does the technical data show 287 litres rather than 300 litres?

The "300L" in the product name refers to the model's capacity band within the manufacturer's range rather than an exact fill volume. The manufacturer's confirmed technical specification lists an actual nominal capacity of 287 litres for this model.

Does this cylinder need a loft cold water tank?

No. As an unvented cylinder, it takes its supply directly from the mains, so no cold water storage tank or header tank is required, freeing up loft space.

What happens if my boiler is not working?

This 300L cylinder includes two 3kW immersion heaters (top and bottom) as standard, which can heat water electrically as a backup, or be used for off-peak electric heating independently of the boiler.

How long does the water take to heat up?

Based on the primary coil and immersion duty (and assuming adequate boiler output), typical reheat time is around 38 minutes from cold.

What is the warranty on this cylinder?

The stainless steel vessel is covered for 25 years, while other components such as valves, thermostats and the immersion heater carry a 2 year parts and labour warranty, subject to registration and the manufacturer's terms and conditions.

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Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

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