Help & Advice



Installation & Preparation 

Before installing a hot tub, there are 3 main considerations:

  • A level solid base for it to sit on

  • An electrical supply

  • A hose pipe

With regards to the base and water supply, we will cover these in our site survey to make sure everything is perfect for your new hot tub.

Depending on the hot tub you purchase you may need additional electrical work to create a 32amp supply or greater.

Hot tubs are heavy, which is why we have special equipment such as spa dolly’s and trailers to help us move the hot tub safely into place. The hot tub is transported on its side to get it into position.


We do a site survey to ensure we can get the hot tub where you would like it but we will also advise if a HIAB or crane is needed, and will make arrangements with our subcontracted companies to assist us.

32 & 40 AMP electrical requirements

For a 32AMP hot tub, 6mm² 3-core SWA cable is needed and a 10mm² 3-core SWA cable is perfectly suitable for a 40AMP Hot Tub.


An IP65 45AMP Rotary Isolator Switch is also recommended so that the hot tub can be isolated outdoors in an emergency or for service work. This is simply a rotary on/off switch but should be sited more than 2 metres away from the hot tub so that bathers cannot be in the hot tub whilst touching the switch.


The electrician should fit a suitable weather proof block connector to the end of the tail from the isolator, the hot tub supply can then be directly hard wired into the weatherproof block connector inside the hot tub. Waterproof gland packs should be used to prevent ingress of water on all electrical connections (2 at the isolation switch). Ensure that all earth cables are clearly colour coded with green/yellow insulating tape or earth sleeve.

Electrical requirements for a hot tub

The electrical installation must comply with BS:7671 – “Requirements for Electrical Installations IET Wiring Regulations”, particularly concerning the following specifications:

  1. The hot tub must be hard wired on its own fused spur back to your household consumer unit, not sharing a supply with any other appliances

  2. The hot tub should be protected by a sufficiently rated MCB (mains circuit breaker) and should cover the maximum amperage pull of the Spa plus 25% to allow for brake torque (i.e. the extra rush of current when pumps are first started). Therefore, a hot tub that has a maximum current draw of 20 amps should be fitted with a 25AMP MCB

  3. The hot tub should be protected against earth faults by an RCD (Residual Current Device). This is a trip switch which prevents the possibility of an electric shock from damaged or waterlogged cables and connections. A suitable rated 30mA RCD is recommended

  4. Outdoor cabling should be protected from damage by either laying protective ducting (pc pipe) below ground or by using Steel Wired Armoured (SWA) cable. Your electrician will calculate the size of cable required depending on the loading and the distance from the mains supply


Myths about hot tubs