Hot Tub Plumbing Sizes

Please remember that water and electricity are a deadly combination and do not mix. Use any of the information contained herein AT YOUR OWN RISK. We will not be held liable for any injuries that may result from the troubleshooting advice or installation of any electrical components in your hot tub spa unit.

 

Imperial

The majority of hot tub pipe used by the UK hot tub industry is based on a North American set of standard pipe sizes

Hot tub piping is sized according to "Nominal Pipe Size" (NPS); it is based on the nominal size of the pipe (in inches) and a 'Schedule'

The schedule specifies the wall thickness of the pipe, according to the NPS, the Hot tub pipe is Schedule 40. As time has gone on some pipe sourced will have a class C ,D or E . E being the closest to US Shedule 40 pipe these again denote the thickness of the pipe wall. If in doubt call us to confirm what you need.

To ascertain your pipework size:

Measure the outer diameter of the pipe. The table below shows the outside diameter of schedule 40 pipe, as used in hot tubs:

Metric

Over recent years we have seen an increase in hot tubs running metric pipe especially if they are of Asian Origin

The outside diameter in mm refers to the size of the pipe. So just measure the outside diameter to ascertain the pipe size

Common sizes are 20mm, 32mm, 40mm, 50mm