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  • RM Stelflow Unvented Stainless Steel Cylinder, Solar Direct, 300 Litres
  • RM Stelflow Unvented Stainless Steel Cylinder, Solar Direct, 300 Litres
  • RM Stelflow Unvented Stainless Steel Cylinder, Solar Direct, 300 Litres
  • RM Stelflow Unvented Stainless Steel Cylinder, Solar Direct, 300 Litres

RM Stelflow Unvented Stainless Steel Cylinder, Solar Direct, 300 Litres
Reference: STSSC300DIR

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The RM Stelflow Unvented Direct Solar Stainless Steel Hot Water Cylinder 2041mm x 545mm 300L 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 Solar Stainless Steel Hot Water Cylinder 2041mm x 545mm 300L 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
  • High efficiency heat exchanger
  • 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 Solar Stainless Steel Hot Water Cylinder 2041mm x 545mm 300L Tech Specifications:



Height1980mm
Diameter545mm
Cold Inlet Height195mm
Immersion 1 Height785mm
Immersion 2 Height1115mm
Sec. Return Height1615mm
Temperature & Pressure Relief Valve Height1785mm
Heating TypeDirect
Capacity300 Litres
Empty Weight50kg
Full Weight347kg
Element Rating1x 3kW
Immersion Reheat Time220 Minutes
Indirect Reheat Time34 Minutes
MaterialStainless Steel
Heat Exchanger22kW
Heat Loss Per Day2.28 kWh
Solar Volume160 Litres
Manufacturer Part Number300DS
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