Installing spa heat pump cabling and plumbing underground

Heat pumps are an optional extra with your spa or swim spa. If one has been included on your Spa World sales order, and you are putting the plumbing and electrical into a trench, then this article is for you.

If you are not using this type of installation, please see the Heat Pump installation article.

A heat pump requiring trenching is a 'non-standard installation'. All electrical work must be carried out by a qualified electrician to electrical standards.

Please be aware:

  • Our team only connects the plumbing and heat pump leads from the heat pump to your spa controller.
  • All plumbing needs to be carried out in accordance with local regulations and the plumbing must be completed by you or your contractor prior to the heat pump installation.

Installing trenching for heat pump pipes and cables

If you choose to install your heat pump with pipework and cabling under the ground there are a few points you will need to consider:

  • Leak testing. Make sure that the plumbing is leak tested before the technicians arrive.
  • The depth of the trench. Unless you are going to concrete over the trench, the electrical cable (heat pump power lead) must be at least 600mm underground and adequately marked and finished off by an electrician. (please consult your own electrician).
  • Distance of heat pump from your spa. Ensure you read the information relating to the distance your heat pump needs to be installed from the spa, if you are going to be trenching 600mm deep, your distance will need to be reduced by at least 1200mm.
  • Width of the trench. The trench will need to be wide enough to accommodate 2 x 40mm plumbing pipes and 2 x electrical conduit one for power and one for data.
  • Timing of work. The plumbing needs to be completed and leak tested before the installation of the heat pump.

Planning your heat pump installation

Follow these handy steps below before the heat pump installer arrives and ensure a smooth, safe and successful installation process.

Before the technician arrives, please make sure:

  • The spa is in position, full of water with power connected.
  • Your trench is dug out and conduit and plumbing are laid to your electrician and plumber’s specifications.

As part of the installation, our technician will:

  • Connect plumbing to the heat pump and the spa.
  • Connect the power lead and data cable to the spa.
  • Run and test the heat pump.
  • Ensure your spa controller is programmed correctly.

Once the installation is complete your electrician will need to come back and finish off the electrical work.

In order to run the power and data cable through separate conduits, your electrician will need to switch off the power supply to the spa.

Once the power is off they can detach the power and data cable from the heat pump and run through the conduit. They will then reconnect the power and data cables and turn the spa back on. Everything should then work as normal.

Please be aware, once the heat pump is installed and operating, your electrician will need to mark and fill in the trench as per regulations.

Important: If you are running your pipework through your slab or deck so that your plumbing is concealed, you will need to run the pipework conduit yourself beforehand.

What is not included in a heat pump installation?

When you include a heat pump with your spa or swim spa installation, we aim to make the process as easy as possible for you however, these are the things that we do not do:

  • Dig trenches or any other building or construction work in order to install the heat pump.
  • We do not do electrical work or fill in trenches.
  • We do not do plumbing runs. We only do the final connections to the heat pumps.

For those tasks, you will need to need to hire external professionals.

Need more help?

We hope this information has been helpful. If you have any questions or concerns over the placement or installation of your heat pump please contact your Spa World concierge.

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