Standard Copper Cylinders



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RM Cylinders prides itself in its flexibility and service, while manufacturing all the industry standard we also excel in prouducing specially designed units to suit a customers requirements - For more information see RM Express.

Cylinders can also be made in various grades to take into account differing working heads, link this to the varying diameters, 300mm through to 800mm, which gives you an overwhelming choice of units.

Selection Guide

Information provided by this website is provided as general information for domestic dwellings and is not a substituation for specialist help. If you are any any doubt always feel free to contact us.


Water Usage


The following can be used as a rough guide for approximate water demand.

  • Standard Bath ------- 60 Litres
  • Corner Bath ------- 120 Litres
  • Gravity Shower ------- 30 Litres
  • Power Shower ------- 60 Litres
  • Wash Basins ------- 5 Litres
  • Kitchen Sink ------- 15 Litres
    •

    Reheat Times


    When using gas or oil boilers high recovery cylinders can be used to achieve quicker reheat times there by reducing the amount of water that needs to be stored.

    Economy 7 heaters utilise off peak electricity by heating the entire cylinder during the night, this reduces the need to operate the immersion heaters during the day to top up the hot water store. This style of cylinder is recomended for most all electric systems.


    • Selection Guide

      Cylinder Capacity In Litres

      Standard Indirect Superheat Combi Unit Direct Economy 7
      Stored Hot Water Required (Litres)
      1 Bedroom & Shower 60 45 65 120
      1 Bedroom & Bath 80 45 85 144
      2 Bedrooms & Standard Bath 100 80 115 144
      3 Bedrooms & Standard Bath 120 80 115 210
      3/4 Bedrooms & Bath & Ensuite 140 120 140 210
      3/4 Bedrooms & Corner Bath 160 160 206 210
      4 Bedrooms & Corner Bath & Ensuite 200 160 206 245
      2/3 Bedrooms & 2 Baths 200 160 206 245
      4/5 Bedrooms & 2 Baths 245 210 206 290
    • Storage Capacities

      Cylinder Capacity In Litres

      Height Diameter
      12" 14" 15" 16" 18" 20"
      Inches mm 300mm 350mm 375mm 400mm 450mm 500mm
      24 600 32 - - - - -
      27 675 37 55 64 69 86 -
      30 750 46 64 69 78 98 -
      33 825 51 69 78 86 109 -
      36 900 55 74 86 98 120 151
      39 975 60 83 98 106 133 166
      42 1050 64 92 103 116 144 179
      44 1125 69 98 109 124 156 193
      48 1200 74 103 120 133 166 200
      54 1350 83 116 133 151 193 235
      56 1425 92 124 143 161 207 248
      59 1500 95 133 152 166 210 255
      62 1575 98 138 156 179 230 281
      65 1650 106 144 166 189 239 294
      68 1725 109 151 175 198 253 308
      71 1800 116 161 184 207 267 322
      76 1900 126 169 193 218 275 338

      Cylinder Capacity In Gallons

      Height Diameter
      12" 14" 15" 16" 18" 20"
      Inches mm 300mm 350mm 375mm 400mm 450mm 500mm
      24 600 7 - - - - -
      27 675 8 12 14 15 19 -
      30 750 10 14 15 17 22 -
      33 825 11 15 17 19 24 -
      36 900 12 16 19 21 26 33
      39 975 13 18 21 23 29 36
      42 1050 14 20 22 25 32 39
      44 1125 15 21 24 27 34 42
      48 1200 16 22 26 29 37 44
      54 1350 18 25 29 33 42 51
      56 1425 20 27 31 35 45 54
      59 1500 21 29 33 37 47 56
      62 1575 22 30 34 39 50 61
      65 1650 23 32 36 41 52 64
      68 1725 24 33 38 43 55 67
      71 1800 25 35 40 45 58 70
      76 1900 28 37 42 48 60 74