Hot Tub FAQs – Your Questions Answered

Have questions about buying or owning a hot tub? You're in the right place. Below we've answered the most common hot tub questions from UK buyers.

1. How much does a hot tub cost in the UK?

Hot tub prices in the UK vary widely depending on size, brand, and specification. Entry-level permanent hot tubs start from around £3,000–£5,000, mid-range models typically cost £5,000–£10,000, and premium hot tubs from top brands can range from £10,000–£25,000+. It's important to consider long-term running costs alongside the purchase price when comparing models.

2. How much does it cost to run a hot tub per month?

Monthly running costs depend on the hot tub's insulation, size, usage frequency, and your electricity tariff. A well-insulated 32 amp hot tub typically costs between £20–£50 per month to run at current UK energy rates. Budget models and 13 amp plug-and-play tubs tend to cost more. Our hot tub running costs guide covers this in full.

3. What is the difference between a 13 amp and 32 amp hot tub?

A 13 amp hot tub plugs into a standard household socket and requires no dedicated installation – it's convenient and lower cost upfront, but generally provides weaker hydrotherapy and higher running costs. A 32 amp hot tub requires a dedicated electrical supply installed by a qualified electrician, but delivers far superior jet performance, better insulation, and lower energy bills over time. We strongly recommend 32 amp models for serious hot tub buyers.

4. How do I maintain a hot tub?

Hot tub maintenance involves several regular tasks:

  • Test water chemistry 2–3 times per week using test strips or a digital tester
  • Add chemicals as needed to keep pH between 7.2–7.6 and sanitiser levels correct
  • Clean filters weekly by rinsing and deep-cleaning monthly
  • Shock the water weekly or after heavy use to eliminate bacteria
  • Keep the cover on when not in use to retain heat and prevent debris
  • Drain and refill every 3–4 months for a full water change

5. How do I choose the right hot tub for my garden?

When choosing a hot tub, consider these key factors:

  • Size and capacity – how many people will regularly use it?
  • Available space – measure your garden and allow maintenance clearance on all sides
  • Budget – include both purchase price and ongoing running costs
  • Seating style – do you prefer upright seats or a lounger?
  • Features – jets, lighting, entertainment systems, and smart controls
  • Energy efficiency – full-foam insulation and quality cover make a big difference to bills

We recommend visiting a WhatSpa?-approved UK showroom to wet test shortlisted models before buying. Download our free buyer's guide for more detailed advice and brand recommendations.

6. What base do I need for a hot tub installation?

Your hot tub requires a solid, level surface capable of supporting its full weight — typically 1,500–2,500 kg when filled with water and bathers. The most common options in the UK are:

  • Concrete slab – The gold standard. At least 100mm thick, reinforced, and fully cured before installation.
  • Paving slabs – Fully bedded on a compacted sub-base with no hollow spots. A practical and popular choice.
  • Decking – Must be specifically engineered to handle the load. Standard domestic decking is rarely sufficient without reinforcement.

Grass and soft ground are not suitable. Always discuss your base with your hot tub retailer before ordering.

7. What electrical supply does a hot tub need?

This depends on the hot tub model:

  • 13 amp hot tubs – Plug directly into a standard outdoor socket (GFCI/RCD protected). No electrician needed for the connection itself, but the socket must be correctly installed.
  • 32 amp hot tubs – Require a dedicated hard-wired circuit installed by a Part P registered electrician. The cable runs from your consumer unit (fuse box) to an isolator switch at least 2 metres from the spa.

Budget £300–£800 for a standard 32 amp hot tub electrical installation in the UK.

8. How often should I change the water in my hot tub?

As a general rule, drain and refill your hot tub every 3 to 4 months. This removes the build-up of total dissolved solids (TDS) — chemical residues, body oils, and contaminants — that accumulate over time and make water harder to balance.

Between full water changes, top up with fresh water as needed due to evaporation and splashout. Use a water testing kit weekly to monitor pH (7.2–7.6), alkalinity, and sanitiser levels.

9. Can I use a hot tub in winter in the UK?

Yes — and many hot tub owners find winter the most enjoyable time to use their spa. Soaking in warm water on a cold night is an exceptional experience. However, there are a few considerations:

  • Running costs increase in colder months as the heater works harder to maintain temperature. A well-insulated hot tub minimises this cost significantly.
  • Keep the temperature set no lower than 30°C even when not in use to prevent freezing.
  • Check and maintain your thermal cover carefully — a waterlogged or cracked cover loses heat rapidly in cold weather.
  • Inspect pipework and equipment during prolonged freezing temperatures.

10. Do I need planning permission for a hot tub in the UK?

In most cases, planning permission is not required for a domestic hot tub in England and Wales. Hot tubs are classed as permitted development when placed in a garden, provided they are not in the front garden or closer to the road than the house itself.

However, if you live in a listed building, a conservation area, or are installing a permanent hot tub enclosure or outbuilding, you may need to check with your local planning authority. Always verify with your local council if you are unsure. For more buying and installation guidance, download our free Hot Tub & Spa Buyer's Guide.