Horizontal Stelflow



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Installation Manual

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Horizontal Manual

The RM Horizontal Stelflow has carefully been brought together from quality components and has been designed with performance in mind.

Using our many years of involvement within the hot water industry and out knowledge of bringing unvented cylinders to the market we have created a new stanard in unvented water storage.


Made To Measure Stainless

RM Cylinders have pushed the boundries even further leaving the competition to catch up once again. Using a state of the art production facility RM Cylinders can produce bespoke Horizontal Stelflow cylinders, tapping sizes and heights can now be changed to suit your application giving you flexability without compromise.

When altering inlet and outlet connections we can even provide corresponding control kits meaning you still end up with a complete packaged solution, leaving nothing to chance.


Horizontal Stelflow Specification


The following outlines the standard specification:

  • Minimum recommended working pressure 1 bar.
  • Maximum working pressure 15 bar.
  • All cylinder connections are 22mm compression.
  • Units tested to 15 bar.
  • Minimum water supply 1.5 bar, 20 litres/min.
  • Primary coil circuit must be pumped.
  • Gravity coils available by special order.
  • Stainless steel stat pocket guaranteed against corrosion.

Horizontal Stelflow Advantages


Stelflow has the following advantages:

  • 25 Year vessel guarantee.
  • Cylinder components guaranteed for 2 years.
  • Available in a range of styles sizes 90 to 600 litres.
  • A range of horizontal cased units.
  • Coil in coil high effeciency coil - high recovery rates.
  • External expansion for reliability and flexible siting.
  • Full Kiwa Approval.


    Technical Specification
  • Cylinder Kit Contents

    Direct Horizontal Stelflow Kit Listing

    Product 120L 150L 180L 210L 250L 300L
    Cold Water Inlet Set 1 1 1 1 1 1
    15x22mm Tundish 1 1 1 1 1 1
    T&P Reflief Valve 1 1 1 1 1 1
    Expansion Vessel 12L 12L 12L 18L 18L 24L
    Exp. Vessel Bracket 1 1 1 1 1 1
    Expansion Vessel Hose 1 1 1 1 1 1
    Immersion Heater 2 2 2 2 2 2
    2 Port Zone Valve 0 0 0 0 0 0
    Dual Thermostat 0 0 0 0 0 0
    Energy Cut Out Stat 0 0 0 0 0 0
    Plastic Grommet 0 0 0 0 0 0
    Wiring Center 0 0 0 0 0 0
    Instruction Manual 1 1 1 1 1 1

    Indirect Horizontal Stelflow Kit Listing

    Product 120L 150L 180L 210L 250L 300L
    Cold Water Inlet Set 1 1 1 1 1 1
    15x22mm Tundish 1 1 1 1 1 1
    T&P Reflief Valve 1 1 1 1 1 1
    Expansion Vessel 12L 12L 12L 18L 18L 24L
    Exp. Vessel Bracket 1 1 1 1 1 1
    Expansion Vessel Hose 1 1 1 1 1 1
    Immersion Heater 1 1 1 1 2 2
    2 Port Zone Valve 1 1 1 1 1 1
    Dual Thermostat 1 1 1 1 1 1
    Energy Cut Out Stat 0 0 0 0 0 0
    Plastic Grommet 0 0 0 0 0 0
    Wiring Center 1 1 1 1 1 1
    Instruction Manual 1 1 1 1 1 1

    • Schematics
  • Direct Technical Drawing

    Code 120DH 150DH 180DH 210DH 250DH 300DH
    Capacity 120L 150L 180L 210L 250L 300L
    Length 941 1128 1316 1504 1754 2067
    Diameter 545 545 545 545 545 545
    Hot Draw 215(A) 215(A) 215(A) 215(A) 215(A) 215(A)
    T&P Valve 311(B) 311(B) 311(B) 311(B) 311(B) 311(B)
    Immersion 1 420(C) 420(C) 420(C) 420(C) 420(C) 420(C)
    Sec. Return - - - 974(D) 1224(D) 1537(D)
    Immersion 2 571(E) 758(E) 946(E) 1134(E) 1384(E) 1697(E)
    Drain Valve 291(F) 291(F) 291(F) 291(F) 291(F) 291(F)
    Cold Feed 571(G) 758(G) 946(G) 1134(G) 1384(G) 1697(G)

  • Indirect Technical Drawing

    Code 120IH 150IH 180IH 210IH 250IH 300IH
    Capacity 120L 150L 180L 210L 250L 300L
    Length 941 1128 1316 1504 1754 2067
    Diameter 545 545 545 545 545 545
    Hot Draw 215(A) 215(A) 215(A) 215(A) 215(A) 215(A)
    T&P Valve 311(B) 311(B) 311(B) 311(B) 311(B) 311(B)
    Immersion 1 470(C) 564(C) 658(C) 752(C) 877(C) 1033(C)
    Sec Return - - - 974(D) 1224(D) 1537(D)
    Boiler Flow 711(E) 898(E) 1086(E) 1274(E) 1524(E) 1837(E)
    Boiler Return 211(F) 211(F) 211(F) 211(F) 211(F) 211(F)
    Drain Valve 291(G) 291(G) 291(G) 291(G) 291(G) 291(G)
    Cold Feed 571(H) 758(H) 946(H) 1134(H) 1384(H) 1697(H)