Harvia Frosty Cold Plunge: One to Two Person Chilled Bath
One configuration. The cooling unit and the insulated cover are in the price, and there is no electrician in this purchase.
£6,195.00
Harvia tub and cooling unit
- Plugs into an ordinary 220 to 240V supply with RCD protection
- Cooling unit and insulated cover included
- 4 to 40°C, about 8°C an hour on 1.0kW
- Tub
- 170cm long, 144cm across including the cooling unit, 99cm to the rim
- Water
- 500 litres at a normal fill, 615 litres brimmed
- Capacity
- One adult lying down, or two seated
- Cooling
- Integrated unit, 1.0kW, about 8°C an hour, R32 refrigerant
- Range
- 4°C to 40°C, so it warms as well as chills
- Also supplied
- An insulated cover
- Electrics
- 220 to 240V, 50Hz, on residual current protection. No dedicated circuit
- Delivery
- One package, 171 x 80 x 115cm, 135kg gross
A 500 litre chilled plunge bath 170cm long, with its cooling unit built in. It holds any temperature between 4 and 40°C, chills at about 8°C an hour, and runs from an ordinary socket rather than the dedicated circuit every sauna here needs.
Delivery & installation
Delivery is included in the price, kerbside to mainland Britain. Offshore, island and remote postcodes are quoted before you order. Nothing is added at the checkout and nothing is invoiced afterwards that you were not shown first.
Delivery to a mainland UK address is in the price. The tub arrives as one package, 171 by 80 by 115cm and 135kg gross, delivered by lorry to the kerb or the nearest firm, level spot the driver can reach. Two people move it from there, and it is 112kg empty with 42kg of that in the cooling unit.
Offshore addresses, the Scottish Highlands and islands, and any address a lorry cannot reach are quoted separately before you order.
There is no installation to arrange. It stands on a flat, load bearing surface, fills with a hose and plugs in.
Warranty
Two years on the tub and two years on the cooling unit, under Harvia's published warranty terms.
Harvia's terms exclude the parts that wear and anything caused by not following the installation, use or maintenance instructions, which on a chilled tub usually means water care rather than the machine.
Claims come to us. One email, and we deal with the distributor and Harvia on your behalf rather than handing you a phone number.
Returns
Fair, clear returns in line with UK consumer law. Full details in our returns policy before you commit to anything.
About this product
A chilled plunge bath 170cm long and 144cm across including its cooling unit, holding 500 litres at a normal fill and 615 litres brimmed. One adult lies in it, two sit.
The cooling unit is integrated and included. It holds anything from 4C to 40C, so the same tub is a plunge in summer and a warm bath in February if you want it to be. Cooling power is 1.0kW, which Harvia publish as roughly 8C an hour, on R32 refrigerant at 51dB(A).
The number that matters for most gardens: it runs from a 220 to 240V supply with residual current protection, so this plugs in rather than needing the dedicated circuit every sauna on this site requires. No electrician, no notifiable work, no consumer unit question.
One honest limit. Harvia publish the range as 4C to 40C, so this does not reach the 0C some plunges advertise. The research on cold water immersion sits between roughly 8C and 15C, so 4C is below the studied band rather than short of it, but if a sub zero number is what you are buying, this is not the tub.
An insulated cover is supplied. The tub weighs 112kg empty, the cooling unit 42kg of that, and it ships at 135kg gross on a package 171 by 80 by 115cm. Two years on both the tub and the cooling unit.
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- Payment on confirmationWe take payment only once your order is confirmed.
- 14 day cancellation rightsCancel within 14 days of delivery, under the Consumer Contracts Regulations 2013.
Who this is actually for.
Every product here is described with the honest opposite beside it: who it suits, and who should buy something else.
At about 4.3 amps this plugs into an ordinary outdoor socket with RCD protection. No dedicated circuit, no consumer unit question, no Part P certificate. If the sauna you were looking at stalled on the electrician's quote, this is the part of the garden that does not.
Worth confirmingyou have no outdoor socket at all. Then you still need an electrician, though a socket is a far smaller job than a 40 amp radial.
The cooling unit is integrated and included, and it holds anything from 4 to 40°C. Harvia publish about 8°C an hour of pull down on 500 litres, so it recovers between sessions rather than needing a day. The insulated cover is in the price and is what keeps the summer sun out of it.
Worth confirmingyou want to chase the lowest number. This holds 4°C, not zero, and if a sub zero figure is the point then this is not the tub.
It heats to 40°C as well as chilling to 4°C. Most plunges only chill, so they sit unused through a British winter when the weather is already doing the cooling for nothing. This one has something to do in February.
Worth confirmingyou only ever want it cold. Then the heating range is capacity you paid for and will not use, and a chill only tub is the cheaper answer.
The three that catch people out are the frost rule, the no-ice rule and how short a session actually is. All three are the manufacturer's own instructions, and all three are easier to hear now than in February.
The numbers you need before you measure the space.
Read this before anything else. The two figures that decide whether this works where you are are the 1,440mm width, which includes the cooling unit, and the filled weight of about 612kg.
The width is the figure people miss. 1,440mm includes the cooling unit sitting alongside the tub, so it is not a 750mm wide bath you can tuck against a wall. Leave access to the unit for servicing, and remember the filled weight: 500 litres of water is half a tonne on top of the 112kg of tub.
Why this one plugs in when the saunas do not.
Every traditional sauna on this site needs a dedicated circuit, an electrician and notifiable work under Part P, because a 6kW heater draws 26 amps and a 9kW one draws 39. That is the single biggest hidden cost in buying a sauna, and it is the reason some gardens cannot have one at all.
A chilled plunge is a different machine. This one is rated at 1.0kW, which is about 4.3 amps at 240V, less than a kettle. It runs from an ordinary outdoor socket on residual current protection. If you already have a socket outside, there is no electrician in this purchase.
The other thing worth understanding is the range. Harvia publish 4°C to 40°C, which means the same tub is a plunge in July and a warm soak in January if that is what you want. Most plunges only go one way.
The commitments nobody lists next to the price.
Stated before you buy rather than discovered afterwards.
Filled, this is roughly 612kg over a footprint of 1.7 by 1.44 metres. A paved terrace or a concrete slab is fine. Timber decking needs checking against that load before you fill it, not after.
1.0kW at 240V is about 4.3 amps, so an ordinary outdoor socket on a 30mA RCD runs it. That is the whole electrical story, and it is the reason this is the least complicated thing on the site to install.
Cold water slows bacterial growth, it does not stop it, and nothing published for this tub removes the need for a residual disinfectant. PWTAG's ice bath standard sets chlorine at 1.0 to 5.0 mg/l at pH 7.0 to 7.6, and treats UV and ozone as secondary systems rather than substitutes. Shower before you get in; it is the single biggest thing you control.
The insulated cover is supplied. Its job is keeping warm air and sunshine out of the water, which is what the cooling unit would otherwise spend its day fighting. In winter the weather does most of the chilling for you and the unit barely runs.
A British winter holds outdoor water in single figures by itself, so for about five months of the year you are paying for a machine that has little to do. That is an argument for judging a chiller on its summer performance, which is the half of the year that actually costs money.
The running costs, with the working shown.
The purchase price is public; the running cost rarely is. Ours are published with the assumptions stated, so you can check the sums rather than take our word for them.
about 23p
Harvia publish about 8°C an hour on 500 litres, so 15°C summer water to 8°C is roughly 53 minutes. At the rated 1.0kW that is about 0.9 kWh, or about 23p at 26.11p a unit.
a note on the arithmetic
Harvia publish both 1.0kW of cooling power and about 8°C an hour on 500 litres. Removing 8°C from 500 litres in an hour is about 4.6kW of heat, so the two figures together imply a coefficient of performance near 4.6. We quote the electricity from the 1.0kW figure, which is the conservative reading, and say so here rather than quietly picking whichever number flatters the running cost.
Assumptions: electricity at the Ofgem price cap unit rate of 26.11p per kWh, 1 July to 30 September 2026, including VAT. The pull down figure uses Harvia's published 8°C an hour and their 1.0kW rating, not a measurement on an installed tub.
What you will actually be doing.
The jobs, and how often
| Job | How often | Who does it |
|---|---|---|
| Test and correct the water A residual disinfectant, tested before bathing and then regularly. PWTAG's ice bath standard sets free chlorine at 1.0 to 5.0 mg/l at pH 7.0 to 7.6, or bromine at 4.0 to 6.0 mg/l at pH 7.2 to 7.6. | Before bathing, then regularly | You |
| Change the water PWTAG's commercial rule is weekly or at every change of guests. | Judge it on use | You |
| Shower before you get in The organisms that matter in a shared tub arrive on people, not in the mains water. Going to the toilet, washing hands and showering with soap first is the pre use routine the standard sets out, and it is free. | Every session | Everyone using it |
| Keep the cover on The insulated cover keeps warm air, sunlight and debris out. Leaving it off in July is the fastest way to make the cooling unit work for its living. | Between sessions | You |
| Keep the cooling unit clear The unit sits alongside the tub and moves air. Leaves, a fence pushed up against it or a cover thrown over it all reduce what it can do. Leave room around it. | Check seasonally | You |
The numbers, plainly.
- Warranty
- 2 year tub and cooling unit warranty
- Lead time
- Estimated 10 to 15 working days from order. We confirm stock and your delivery date in writing when we process your order.
Figures are Harvia's own published specification for the Frosty. Where a figure is ours rather than theirs, it says so.
What comes with it.
- The tub, 1,700mm long, holding 500 litres at a normal fill
- The integrated cooling unit, rated 1.0kW on R32 refrigerant
- An insulated cover
- Delivery on one package to the kerb at a mainland UK address
- Two years on the tub and two years on the cooling unit
- One point of contact for the order, the delivery and anything that goes wrong: us
- The base. A flat, level surface able to carry about 612kg filled
- Water treatment chemicals and test kit, which are yours to buy and to manage
- An outdoor socket, if you do not already have one
- Delivery to offshore and remote postcodes, which is quoted before you order
What you still have to arrange.
Harvia publish the range as 4 to 40°C, and this tub holds 4°C rather than zero. The cold water immersion research sits between roughly 8 and 15°C, so 4°C is already below the studied band, but if a sub zero number is what you are buying then this is not it and we will say so.
Filled, this is roughly 612kg over 1.7 by 1.44 metres. A paved terrace or a slab carries it. Timber decking needs checking against that load first, and a lawn does not.
The 1,440mm width includes the cooling unit sitting alongside the tub, so this does not tuck into a 750mm gap the way a bare tub does. Measure for the unit as well as the bath.
Cold slows bacterial growth, it does not stop it, and no published system on this tub removes the need for a residual disinfectant. If testing and correcting water is not something you will do, a plunge of any make is the wrong purchase.
None of this is unusual for the category. It is listed because finding it out after delivery is what turns a good purchase into a bad week.
What we know, and how we know it.
Where every figure on this page comes from, with the source beside it.
- Dimensions, volumes and weights
-
Verified
Length, width, height, internal depth, the 500 litre fill and 615 litre total, the 112kg dry weight, the 42kg cooling unit and the 135kg package are all Harvia's own published figures for the Frosty.
- Cooling and electrical
-
Verified
The 4 to 40°C range, the 1.0kW rating, the R32 refrigerant, the 51 dB(A) sound level and the 220 to 240V connection with residual current protection are Harvia's published figures. The 4.3A current and the 612kg filled weight are our arithmetic and are labelled as ours.
- The two cooling figures, and why we quote the lower one
Harvia publish both 1.0kW of cooling power and about 8°C an hour on 500 litres. Those two together imply a coefficient of performance near 4.6, which is plausible for a small chiller but is not a figure Harvia state. The running cost section uses the 1.0kW rating, which is the conservative reading.
First hand states will be added when we have run one of these for a full season. Until then, nothing on this page is presented as tested by us.
Weighing this against another cold plunge? Let us do the homework.
Choosing between two plunge baths takes evenings of research, so let us carry it. Name the other one you are considering and we will put the two side by side properly: size, temperature range, what the running cost actually works out at, and what each one asks of your floor and your electrics. A written comparison or a call, whichever suits you, within 24 hours. And if the other one genuinely fits your space better, we will say so.