FREE Shipping for orders over £50

RM Stelflow Unvented Indirect Twin Coil Horizontal Cylinder

From £1,705.70 From £1,153.87

Gas Boiler & Solar Heated Hot Water Storage

  • 25 year guarantee on the vessel
  • 2 years guarantee on components
  • 50mm High-density insulation
  • Full unvented kit supplied, including remote expansion vessel
  • Treated to protect against corrosion

*Cradles are included

*Allow 10-14 working days for delivery


SKU: Stelflow Unvented Indirect Twin Coil Horizontal Categories: ,


RM Stelflow Unvented Indirect Twin Coil Horizontal Cylinder

The RM Stelflow Horizontal Indirect has been designed to be incredibly flexible. While still retaining all the advantages of an indirect cylinder with the advantage of being able to install the unit where previously impossible because of head height. The internal corrugated coil facilitates the design while still remaining exceptionally powerful with fantastic reheat times. This Twin Coil presents the opportunity to combine multiple heat sources into one unit without sacrificing floor space, designed to work with solar thermal the unit can also be upgraded with minimal additional components to accept two boiler inputs.

RM Stelflow hot water cylinders have been constructed using high-quality components. A manufacturer guarantee of 25-year guarantee on the vessel and 2 years on parts, will give you a well-deserved peace of mind.



  • Working pressures Min: 1bar, Max: 3bar
  • 22mm compression fittings throughout
  • Minimum water supply 1.5bar, 20 Litres/min
  • 50mm insulation
  • New flat base for stability
  • 3kW Incoloy Immersion heater as standard
  • Clearly labelled unit connections
  • Butt welding for long life
  • 25-year guarantee on the vessel, 2 years on parts
  • High-efficiency Heat Exchanger


Kit Included



Technical Specification


Product IH-RM058 IH-RM059 IH-RM060 IH-RM061
Capacity 180L 210L 250L 300L
Height (mm) 545 545 545 545
Diameter (mm) 1280 1470 1720 1980
Weight Empty (kg) 33 37 43 50
Weight Full (kg) 211 245 291 347
ErP Band C C C C


Additional information


180 Litre, 210 Litre, 250 Litre, 300 Litre


RM Cylinders




There are no reviews yet.

Be the first to review “RM Stelflow Unvented Indirect Twin Coil Horizontal Cylinder”

Your email address will not be published. Required fields are marked *