Gledhill PLUDR400S 400L Plus Direct Solar Unvented Hot Water Cylinder

The Gledhill PLUDR400S is a StainlessLite Plus Solar Direct unvented hot water cylinder offering 393 litres of dedicated solar storage capacity. It is purpose-built for solar thermal systems in domestic properties with high hot-water demand.

This direct model uses two 3kW incoloy immersion heaters alongside a high-performance corrugated solar coil, delivering mains-pressure hot water while maximising renewable input. Trade installers and larger households benefit from its robust duplex stainless steel construction and 25-year warranty.

Key Features

• Specifically designed for solar thermal panels
• Corrugated coil maximises solar heat transfer
• Two 3kW incoloy 825 immersion heaters (secondary + emergency backup)
• ErP rating C with 87W heat loss
• Duplex stainless steel cylinder
• Secondary return connection fitted
• 25-year manufacturer warranty
• Vertical floor-standing orientation
• Supplied with inlet control group, expansion vessel, T&P relief valve and tundish

Benefits

• ✔ Maximises solar contribution for lower running costs
• ✔ Provides reliable electric backup when solar input is low
• ✔ Mains-pressure performance for powerful showers and baths
• ✔ Excellent insulation minimises standing heat loss
• ✔ Corrosion-resistant duplex stainless steel for long service life
• ✔ Secondary return enables fast hot-water delivery to distant taps
• ✔ Meets Building Regulations when correctly matched to solar array
• ✔ Full UK trade support and spares availability

Technical Specifications

• MPN: PLUDR400S
• Capacity: 393 litres
• Height: 2030 mm
• Diameter: 630 mm
• Weight (empty): 49 kg
• Weight (full): 449 kg
• ErP rating: C
• Heat loss: 87 watts
• Dedicated solar volume: 150 litres
• Number of immersions: 2
• Secondary return: Yes
• Material: Duplex stainless steel

What’s in the Box?

1 x Gledhill PLUDR400S StainlessLite Plus Solar Direct 400L cylinder complete with immersion heaters, solar coil, inlet control group, expansion vessel, T&P relief valve, tundish, drain valve and installation literature.