Slimline Stelflow



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Stelflow Manual

The RM Slimline 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 Slimline 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.


Slimline 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.

Slimline 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
  • Slimline Stelflow Performance
    Weight Empty Weight Full (kg) Full Cold Capacity (l) Reheat Indirect Total Minutes Reheat 3kW Immersion Minutes EN12897 Heat Exchange kW Dedicated Solar Volume Litres Standing Loss Cylinder kWh/Day
    60L Direct 21 81 60 - 46 - - 0.99
    60L Indirect 23 81 58 9 30 16.2 - 0.99
    90L Direct 25 115 90 - 77 - - 1.2
    90L Indirect 27 115 88 13 54 16.2 - 1.2
    120L Direct 31 151 120 - 104 - - 1.4
    120L Indirect 36 154 118 17 81 16.2 - 1.4
    150L Direct 39 189 150 - 135 - - 1.6
    150L Indirect 45 193 148 18 107 18.35 - 1.6
    150L D.Solar 47 193 148 18 108 16.2 80 1.6
    150L T.Coil 49 194 147 18 59 16.2 77 1.6
    180L Direct 45 225 180 - 165 - - 1.9
    180L Indirect 50 228 178 22 137 18.35 - 1.9
    180L D.Solar 53 228 178 22 130 18.35 100 1.9
    180L T.Coil 55 230 177 22 81 18.35 95 1.9
    210L Direct 48 258 210 - 205 - - 2.16
    210L Indirect 53 261 208 24 168 21 - 2.16
    210L D.Solar 55 261 208 24 151 21 116 2.16
    210L T.Coil 58 264 207 24 95 21 101 2.16
  • Cylinder Kit Contents

    Direct Stelflow Kit Listing

    Product 60L 90L 120L 150L 180L 210L
    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 12L 18L 18L
    Exp. Vessel Bracket 1 1 1 1 1 1
    Expansion Vessel Hose 1 1 1 1 1 1
    Immersion Heater 1 1 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 Stelflow Kit Listing

    Product 60L 90L 120L 150L 180L 210L
    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 12L 18L 18L
    Exp. Vessel Bracket 1 1 1 1 1 1
    Expansion Vessel Hose 1 1 1 1 1 1
    Immersion Heater 1 1 1 1 1 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

    Direct Solar Stelflow Kit Listing

    Product 60L 90L 120L 150L 180L 210L
    Cold Water Inlet Set - - - 1 1 1
    15x22mm Tundish - - - 1 1 1
    T&P Reflief Valve - - - 1 1 1
    Expansion Vessel - - - 12L 18L 18L
    Exp. Vessel Bracket - - - 1 1 1
    Expansion Vessel Hose - - - 1 1 1
    Immersion Heater - - - 2 2 2
    2 Port Zone Valve - - - 0 0 0
    Dual Thermostat - - - 0 0 0
    Energy Cut Out Stat - - - 1 1 1
    Plastic Grommet - - - 1 1 1
    Wiring Center - - - 0 0 0
    Instruction Manual - - - 1 1 1

    Twin Coil Stelflow Kit Listing

    Product 60L 90L 120L 150L 180L 210L
    Cold Water Inlet Set - - - 1 1 1
    15x22mm Tundish - - - 1 1 1
    T&P Reflief Valve - - - 1 1 1
    Expansion Vessel - - - 12L 18L 18L
    Exp. Vessel Bracket - - - 1 1 1
    Expansion Vessel Hose - - - 1 1 1
    Immersion Heater - - - 1 1 1
    2 Port Zone Valve - - - 1 1 1
    Dual Thermostat - - - 1 1 1
    Energy Cut Out Stat - - - 1 1 1
    Plastic Grommet - - - 1 1 1
    Wiring Center - - - 1 1 1
    Instruction Manual - - - 1 1 1

    • Schematics
  • Direct Technical Drawing

    Code 60SD 90SD 120SD 150SD 180SD 210SD
    Capacity 60L 90L 120L 150L 180L 210L
    Height 645(F) 930(F) 1195(F) 1470(F) 1735(F) 1980(F)
    Diameter 475 475 475 475 475 475
    Cold Inlet 173(A) 173(A) 173(A) 173(A) 173(A) 173(A)
    Immersion 1 223(B) 223(B) 223(B) 223(B) 223(B) 223(B)
    Immersion 2 - - 733(C) 916(C) 1093(C) 1256(C)
    Sec. Return - - - - - 1676(D)
    T&P Valve 448(E) 733(E) 998(E) 1273(E) 1538(E) 1783(E)

  • Indirect Technical Drawing

    Code 60SI 90SI 120SI 150SI 180SI 210SI
    Capacity 60L 90L 120L 150L 180L 210L
    Height 645(H) 930(H) 1195(H) 1470(H) 1735(H) 1980(H)
    Diameter 475 475 475 475 475 475
    Cold Inlet 399(D) 399(D) 399(D) 474(D) 474(D) 474(D)
    Bottom Coil 299(A) 299(A) 299(A) 339(A) 339(A) 374(A)
    Immersion 1 339(B) 339(B) 379(B) 379(B) 414(B) 414(B)
    Stat Pocket 354(C) 354(C) 354(C) 394(C) 394(C) 474(C)
    Immersion 2 - - - - - 1256(E)
    Sec. Return - - - - - 1676(F)
    T&P Valve 448(G) 733(G) 998(G) 1273(G) 1538(G) 1783(G)

  • Twin Technical Drawing

    Code 150ST 180ST 210ST
    Capacity 150L 180L 210L
    Height 1470(I) 1735(I) 1980(I)
    Diameter 475 475 475
    Bottom Coil 280(A) 280(A) 355(A)
    Stat Pocket 335(B) 335(B) 410(B)
    Cold Inlet 380(C) 380(C) 455(C)
    Top Coil 632(D) 676(D) 770(D)
    Immersion 1 683(E) 715(E) 820(E)
    Stat Pocket 687(F) 719(F) 824(F)
    Sec. Return - - 1563(G)
    T&P Valve 1273(H) 1538(H) 1783(H)

  • Direct Solar Technical Drawing

    Code 150SDS 180SDS 210SDS
    Capacity 150L 180L 210L
    Height 1470(H) 1735(H) 1980(H)
    Diameter 475 475 475
    Bottom Coil 280(A) 280(A) 355(A)
    Stat Pocket 320(B) 320(B) 395(B)
    Immersion 1 335(C) 335(C) 445(C)
    Cold Inlet 415(D) 415(D) 455(D)
    Immersion 2 916(E) 1093(E) 1256(E)
    Sec Return - - 1676(F)
    Sec. Return 1273(G) 1538(G) 1783(G)