What a cold plunge is, and how it differs from an ice bath
A cold plunge is a purpose-built vessel for cold-water immersion, run cold, typically somewhere between about 3°C and 15°C. The difference between a cold plunge and a basic ice bath is less about the water and more about the kit around it. A portable ice bath is a simple tub you fill with cold water and ice; a cold plunge, as this page uses the term, is an insulated tub paired with a chiller that cools and holds the water for you, ready whenever you are.
If you just want to try cold immersion cheaply, start on our ice baths hub, which covers what an ice bath is and the entry-level, portable options. This page is for the permanent, low-hassle end: insulated tubs, chillers and outdoor plunge setups you use as a daily ritual rather than an occasional experiment. A cold plunge is also the cold half of the sauna-then-cold sequence, so if you plan to do both, see our guide to the sauna and cold plunge.
Cold plunge tub types, from portable to permanent
There is a clear ladder from a bucket of iced water to a purpose-built plunge, and the step that defines a true cold plunge is the chiller.
Portable or inflatable ice bath (the entry point). The cheapest way in: you fill it with cold water and add ice. Prices start from around £89 for a compact single tub up to about £499 for an insulated two-person model, and many are sold chiller-compatible so you can upgrade later. This is really the ice bath end of the market, so we keep it light here and cover it fully on the portable ice bath page.
Barrel or thermowood plunge tub. A permanent, garden-friendly step up, often sold chiller-ready with the chiller bought separately. A thermowood or cedar barrel with a liner, lid and steps sits around £1,500 to £2,000 before a chiller, as a guide price correct as of October 2026.
Insulated hard-shell tub with an integrated chiller (the core of this page). A purpose-built, multi-layer insulated shell with a built-in chiller that cools and holds a set temperature, so you plunge on demand without ice. Budget units start around £1,299; premium UK-built tubs run from about £3,499 to £5,999 depending on size and features.
Standalone chiller (to upgrade a tub you already own). A chiller unit cools, filters and sanitises any suitably insulated tub, holding around 3°C, from about £899. If you already have a well-insulated tub, this is the route to a true cold plunge. Our ice bath chiller guide covers the specs that matter.
Do you need a chiller?
The single biggest difference between a purpose-built cold plunge and a basic ice bath is temperature control. A chiller cools the water and holds it there, so you are not buying and tipping in ice before every session, and it usually filters and sanitises the water too. That is what turns cold immersion from a chore into a daily habit.
Insulation is its partner. A well-insulated shell keeps the cold in, so the chiller runs less often and costs less to run. Look for air-gap or multi-layer shells; the better the insulation, the cheaper the plunge. Chiller-held tubs commonly reach around 3°C, well below the 15°C that research treats as the threshold for cold-water immersion, so there is plenty of range to set a temperature that suits you. If you would rather add a chiller to a tub you already own, choosing the unit is a topic in its own right, covered on our ice bath chiller page.
What a cold plunge costs to buy and run
As a guide, a portable or inflatable ice bath runs from about £89 to £499, a thermowood barrel plunge tub around £1,500 to £2,000 before a chiller, and a standalone chiller from about £899. The heart of this page, an insulated hard-shell tub with an integrated chiller, starts around £1,299 at the budget end and runs from about £3,499 to £5,999 for premium UK-built units. A plumbed-in, built-in plunge pool costs more again once you add groundwork and installation.
Running cost is simple, because the tub itself uses no power; the chiller is the only meaningful cost. One UK retailer quotes its integrated-chiller tub at roughly 1.2 kWh a day. At the current price-cap rate of 26.32p per kWh that is about 32p a day, or roughly £9 to £10 a month. In practice a chiller works harder in warm weather, with thinner insulation, at a lower target temperature, or when the tub is opened often, and the same retailer estimates £15 to £25 a month in real use. A fair guide figure is roughly £10 to £25 a month, and a good cover cuts it by keeping heat and debris out.
Guide prices, correct as of July 2026, and running costs based on 26.32p per kWh (Ofgem cap, 1 October to 31 December 2026). The energy price cap changes quarterly, so check current rates before budgeting. Guide prices are typical UK costs, not live prices.
Putting a cold plunge outdoors: siting and electrics
A cold plunge suits a garden as well as a utility room or garage. Filled, it is heavy, so it needs level, load-bearing, well-drained ground: a slab, reinforced decking or a prepared base. Leave room around the chiller for airflow, and remember it is not silent (around 44 to 46 dB), so think about where it sits relative to the house and your neighbours.
The chiller needs a suitable, weatherproof, RCD-protected outdoor socket. Fixed outdoor electrical work is notifiable under Building Regulations Part P in England and Wales and should be done by a qualified electrician; the rules differ across the UK nations, so check the current guidance on GOV.UK. A freestanding tub is unlikely to need planning permission, but a permanent, built-in plunge pool might, so check with your local planning authority. If you would rather not manage the base, power and setup yourself, a vetted installer can handle it.