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  • RM Stelflow Unvented Slimline Stainless Steel Cylinder, Direct, 90 Litres
  • RM Stelflow Unvented Slimline Stainless Steel Cylinder, Direct, 90 Litres
  • RM Stelflow Unvented Slimline Stainless Steel Cylinder, Direct, 90 Litres
  • RM Stelflow Unvented Slimline Stainless Steel Cylinder, Direct, 90 Litres

RM Stelflow Unvented Slimline Stainless Steel Cylinder, Direct, 90 Litres
Reference: STS90DIR

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The RM Stelflow Unvented Direct Slimline Stainless Steel Hot Water Cylinder 930mm x 475mm 90L is a cost-competitive hot water cylinder manufactured from high-strength, high-quality Duplex stainless steel. Designed for unvented hot water systems, this cylinder is directly heated solely via 1 x 3kW immersion heater. It comes supplied with the cold water inlet set, tundish, T&P relief valve, expansion vessel, energy cut out stat and 3kW immersion heater. It comes complete with a 25 year guarantee on the vessel and 2 years on the cylinder components for total peace of mind.

RM Stelflow Unvented Direct Slimline Stainless Steel Hot Water Cylinder 930mm x 475mm 90L Features:


  • Direct cylinder - heated solely through 1 x 3kW Incoloy immersion heater
  • Designed and manufactured right here in the UK to provide cost-effective water heating
  • Built to exacting high standards from high strength Duplex stainless steel
  • Includes 50mm foam insulation for improved re-heat times
  • Fitted with 22mm compression fittings throughout
  • Part of the Stelflow range of hot water cylinders from RM Cylinders
  • 25 year vessel guarantee provided by RM Cylinders
  • 2 year guarantee provided on the cylinder components


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RM Stelflow Unvented Direct Slimline Stainless Steel Hot Water Cylinder 930mm x 475mm 90L Tech Specifications:



Height900mm
Diameter475mm
Cold Inlet Height162mm
Immersion 1 Height212mm
Immersion 2 Height-
Sec. Return Height-
Temperature & Pressure Relief Valve Height722mm
Heating TypeDirect
Empty Weight25kg
Full Weight115kg
Capacity90 Litres
Element Rating1x 3kW
Immersion Re-Heat Time77 Minutes
Heat Loss Per Day1.2 kWh
MaterialStainless Steel
Manufacturer Part Number90SD
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