Before purchasing a hot tub, it’s essential to understand the practical aspects of installation — especially drainage, power supply, and water connections. A large hot tub can hold up to 4,000 litres of water, so it’s worth planning your setup in advance. This guide explains what garden connections you’ll need before owning your first spa.
1️⃣ Hot Tub Drainage Options
Efficient water drainage is a must for both wooden, polypropylene, and fiberglass tubs. There are three main options:
- Standard drain valve (43mm diameter): The most common solution, included with most tubs. Typically connects to a hose or PVC pipe under the tub.
- External tap (1-inch / 25mm): A metal valve connector suitable for larger spas or built-in hot tubs. Comes pre-installed with integrated heater models.
- External tap with quick adapter: Designed for fast hose connection — compatible with standard 12–15mm garden hoses.
2️⃣ Electrical Requirements for Hot Tubs
If you’re planning to install electric-powered systems such as massage jets, filtration, or LED lighting, make sure your home circuit can handle the load. Here’s a breakdown of the main electrical components:
Air Massage Pump
| Voltage | 230V |
| Power | 700W |
| Connection Type | Type F (2 pins grounded 16A 220–240V) |
Hydromassage Pump
| Power | 0.9kW |
| Voltage | 230V |
| Connection Type | Type F (2 pins grounded 16A 220–240V) |
LED Lights
| Power | 10W |
| Voltage | 240V |
| Connection Type | Type C (2 pins grounded 16A 220–240V) |
Electric Heater
| Power | 3–18kW |
| Voltage Options | 230V 1-phase (3–6kW), 230V 3-phase (3–18kW), 400V 3-phase (3–18kW) |
| Connection | Consult a qualified electrician; wiring diagrams are provided in your installation guide. |
Circulation Pump
| Voltage | 230V |
| Power | 550W |
| Connection | Type F (2 pins grounded 16A 220–240V) |
Sand Filtration System
| Voltage | 230V |
| Power | 200W |
| Connection | Type F (2 pins grounded 16A 220–240V) |
3️⃣ Garden Power Supply Setup
When you order a hot tub with an electric heater, TimberIN includes a fuse box that powers all electrical systems — no additional sockets required. Just connect the fuse box to your household grid, and all components will function together safely.
If your setup uses a wood-fired heater instead, appliances like pumps and LED lights can still be powered via a standard extension cord with multiple sockets.
For more guidance, see our related articles: Guide to Building an Outdoor Sauna and How to Fill and Empty a Hot Tub.