Gledhill PROIN300H 300L Pro Horizontal Indirect Unvented Hot Water Cylinder

The Gledhill PROIN300H is a 300L capacity (288 litres actual) Stainless Pro Horizontal Indirect Unvented Hot Water Cylinder designed for installations where height is limited. It delivers mains-pressure hot water from a gas or oil boiler and suits both new builds and replacements in domestic properties.

Manufactured in the UK from highly corrosion-resistant duplex stainless steel with 50mm HCFC-free EnviroFoam insulation, it achieves ErP C rating and low heat loss. The horizontal orientation and high-efficiency corrugated coil make it perfect for trade professionals and DIY-savvy homeowners tackling awkward spaces.

Key Features

• 288 litre actual capacity (300L nominal)
• Horizontal design for height-restricted areas
• High-efficiency corrugated primary coil
• 3kW Incoloy immersion heater included
• 50mm HCFC-free EnviroFoam insulation
• Duplex stainless steel construction
• 25 year warranty (domestic, on registration)
• Secondary return connection
• ErP rating C
• Compatible with gas or oil boilers

Benefits

• ✔ Provides mains pressure hot water without a boost pump
• ✔ Fits where vertical cylinders cannot
• ✔ Rapid heat transfer via corrugated coil
• ✔ Low heat loss reduces running costs
• ✔ Long 25-year warranty for peace of mind
• ✔ High flow rates for multiple outlets
• ✔ Factory-fitted components for easier installation
• ✔ Corrosion resistant for durability
• ✔ Suitable for open vented or sealed primary systems

Technical Specifications

• MPN: PROIN300H
• Capacity: 288 litres
• Diameter: 550 mm
• Height: 585 mm
• Width: 1990 mm
• Weight (empty): 46 kg
• Weight (full): 334 kg
• Heat loss: 91 W
• Primary coil rating: 21.6 kW
• Immersion heater: 3 kW
• Expansion vessel: 35 litres
• Pressure reducing valve: 3 bar
• Max working pressure: 5 bar
• ErP rating: C
• Material: Duplex stainless steel

What’s in the Box?

1 x Gledhill PROIN300H Pro Horizontal Indirect Unvented Cylinder, 1 x 3kW Incoloy immersion heater, 1 x Cold water inlet PRV combination valve/expansion relief valve, 1 x Pressure and temperature relief valve, 1 x Control thermostat/energy cut-out thermostat, 1 x Energy cut-out motorised valve.