Standard Copper Combinations



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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
      18"/450mm 18"/450mm 20"/500mm 20"/500mm
      Inches mm Hot Cold Hot Cold
      30 750 60 20 - -
      36 900 85 20 - -
      45 1075 115 20 - -
      48 1200 120 40 145 45
      55 1400 145 40 - -
      73 1850 210 40 - -

      Cylinder Capacity In Gallons

      Height Diameter
      18"/450mm 18"/450mm 20"/500mm 20"/500mm
      Inches mm Hot Cold Hot Cold
      30 750 13 4 - -
      36 900 19 4 - -
      45 1075 24 4 - -
      48 1200 26 9 32 10
      55 1400 32 9 - -
      73 1850 46 9 - -