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Product Assistance

Tapping Chart

To assist with determining the correct size connection for replacement units or units to fit your current system, we have created a table of external and internal thread sizes.

BSP Male Female
1/2" 20.7mm 19.2mm
3/8" 16.6mm 15.0mm
3/4" 26.1mm 24.2mm
1" 32.8mm 30.4mm
1 1/4" 41.6mm 40.0mm
1 1/2" 47.6mm 44.9mm
2" 59.3mm 56.9mm
1 3/4" N/A 50.8mm
2 1/4" N/A 63.0mm
15mm Compression 20.7mm 19.2mm
22mm Compression 28.3mm 26.7mm
28mm Compression 34.6mm 32.6mm

Capacity Calculator

This calculator is designed to assist the specification of a cylinder by determining the amount of hot water available from a cylinder of a specific size; this can be particularly useful in situations where space for a cylinder is limited.

Height mm
Diameter mm
Literage Litres.

Uninsulated Cylinder Calculator

This calculator is designed to assist the specification of a cylinder by determining the size of the cylinder from it's circumference and insulation thickness; this can be particularly useful in situations where a replacement cylinder is required, but due to the insulation it is difficult to determine the size of cylinder required.

 

 

Please note - The final figures are approximate and should be rounded to the nearest standard diameter (375,400,450 etc.)

Circumference mm
Average Insulation Thickness mm
Insulated Diameter mm
Uninsulated Diameter mm

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