Gledhill PROIN300PP StainlessLite Pre-Plumbed 300L Indirect Unvented Cylinder

The Gledhill PROIN300PP is a StainlessLite Pre-Plumbed 300L indirect unvented hot water cylinder designed for heat-only boilers. It offers a plug-and-play solution with pre-plumbed manifold, two heating zones and pump, making it perfect for new-build housing developments where installation speed and standardised pipework are essential.

Manufactured from premium duplex stainless steel with 50mm insulation, the cylinder delivers reliable mains-pressure hot water while minimising heat loss. It suits trade installers and developers working on domestic or light commercial projects requiring Building Regulations G3 compliance and long-term durability.

Build quality includes a wide base for stability, flat top for improved insulation, vertically aligned tappings and a corrugated coil for efficient heat transfer and scale resistance. Supplied with a 25-year warranty for peace of mind.

Key Features

• Pre-plumbed manifold with two heating zones and pump for rapid installation
• Designed specifically for heat-only boilers
• 287 litre actual capacity (300L nominal)
• ErP rating C with 86W heat loss
• Secondary return connection included
• Two 3kW immersion heaters
• 25-year warranty on cylinder
• Fitting template supplied
• Wide base and colour-matched components
• Corrugated coil for improved heat transfer

Benefits

• ✔ Reduces installation time on new-build sites
• ✔ Standardised plumbing configuration across multiple dwellings
• ✔ Reliable mains-pressure hot water performance
• ✔ Excellent heat retention and energy efficiency
• ✔ Easy pipework connections with aligned tappings
• ✔ Long-term durability with 25-year warranty
• ✔ Complete G3 compliant package
• ✔ Stable and neat appearance with wide base
• ✔ Prevents scale build-up with corrugated coil

Technical Specifications

• MPN: PROIN300PP
• Capacity: 287 litres
• Height: 1990 mm
• Diameter: 550 mm
• Weight (empty): 54 kg
• Weight (full): 341 kg
• ErP Rating: C
• Heat Loss: 86 watts
• Heat Up Time: 38 minutes
• Number of Immersions: 2
• Secondary Return: Yes

What’s in the Box?

1 x Pre-plumbed StainlessLite Indirect cylinder, 2 x 3kW immersion heaters, potable expansion vessel with wall bracket, T&P relief valve, tundish, drain valve, compression fittings, dual control/overheat thermostat, 2-port zone valve, fitting template and technical literature.