How much is a cold plunge? Equipment, ice, power and the three-year total

Cold plunge marketing talks about temperature. Cold plunge ownership is about three costs: the tub, what you spend chilling the water, and what you spend changing it. Only the first one is on the product page.

How much is a cold plunge? The sticker range first

The tub is the number you can look up, so here it is at US retail in September 2026 (the two Redwood tubs re-checked 17 October 2026, the Ice Barrel 300 and the Plunge 18 October 2026), for the tubs the buying guide ranks:

Two things that table hides. A chiller bought separately for an ice-only tub is $1,000–$3,000 and needs a $250–$600 dedicated circuit, so the $1,149.99 Ice Barrel 300, the tub here with chiller ports built in, becomes a $2,400–$4,750 system the day you tire of buying ice. And the gap between the two integrated rows, $6,999 and $9,990, is mostly filtration and ozone, which is a water-change cost rather than a temperature cost — the water changes section below is where that money either earns its keep or does not.

The rest of this page is the part the product page leaves out: what it costs to keep the water cold and clean for three years.

How much does an ice bath cost? The ice-versus-chiller break-even

This is the calculation that should happen before any product comparison.

Ice. How much depends on how far the water has to fall each session, and until 18 October 2026 this page got that wrong: it said 40 to 60 lb takes 100 gallons “from tap temperature to the mid-40s”, which by the heat-balance arithmetic takes roughly twice that. Our ice calculator runs the arithmetic with a 15% allowance for heat leaking in. At its default $3.50 for a 10-lb bag, it gives two very different answers for a 100-gallon tub:

• Refilling from tap, 68°F down to 50°F: about 109 lb, about $38 a session.
• Re-cooling a covered tub whose water stays in for weeks and has drifted up 3 to 8°F since the last plunge: about 18 to 49 lb, roughly $6 to $17 a session.

Most ice-tub owners live in the second case, and where in it depends on how fast a covered tub warms between sessions, which nobody publishes, ourselves included. Put a thermometer in before you add ice and you know which row you are on.

Calculator output at $3.50 a 10-lb bag, 100 gallons, 50°F target, 15% heat-gain allowance; your bag price scales every cell.

Chiller. A one-time $1,000–$3,000, plus a $250–$600 dedicated circuit, plus modest ongoing power: $1,250 to $3,600 before power.

The non-financial part matters too. Ice means a trip to the store before every session, which is the friction that quietly ends most ice-based plunge habits by month four. Chillers convert a chore into a thermostat setting, and habit adherence is arguably what you are really buying.

Where the electricity actually goes

A chiller does two jobs with very different costs. (The sauna twin of this section, with the duty cycle derived from heat loss instead of assumed, is the sauna electricity calculator.)

Initial pull-down — 65–70°F tap water down to 45°F — runs the compressor hard for 8 to 24 hours depending on horsepower and gallons. This is the expensive part, and it happens once (plus after every water change).

Hold mode replaces heat leaking in. On a well-insulated tub with a sealed lid, the compressor cycles briefly and infrequently. On a thin tub with a loose lid, it runs and runs.

The variable that dominates hold cost is not horsepower. It is evaporative and conductive loss, which means:

1. Lid seal. The single biggest heat gain path in an uncovered tub is evaporation from the surface. A rigid, sealing insulated lid can roughly halve hold-mode energy.
2. Wall insulation. A double-walled insulated tub versus a single-wall polymer shell is a large multiplier on standby load.
3. Ambient temperature. A 95°F garage means a 50°F differential to fight. A 60°F basement means 15°F. That is more than three times the load for identical equipment.

Water changes: the real maintenance cost

Each change means draining 100–130 gallons somewhere sensible, refilling, and — if chilled — paying for another full pull-down. That last point is the hidden cost of poor filtration: every water change costs you a pull-down cycle, not just the water.

This is why ozone is worth more than its spec-sheet prominence suggests. It is not a health feature; it is the difference between fifty-two drain-and-refills a year and five.

Drainage

You will be dumping 100–130 gallons on a schedule. Onto a lawn occasionally is fine. Onto the same three square feet of lawn every week is not — it will die, and then it will be mud.

Budget $200–$600 for a French drain to a dry well, or plan a hose route to a storm drain or a gravel bed. Indoors on a garage slab, plan the route to a floor drain or door before you position the tub, because a full plunge is not something you reposition afterwards.

What we have not measured

This page is arithmetic, not metering, and that is the honest description of it. We have not put a power meter on a chiller for a pull-down or a hold cycle, so every electricity statement here is directional — “the compressor cycles rather than running continuously” is a description of how the equipment works, not a kWh figure we recorded. The ice quantities are the ice calculator’s heat-balance arithmetic, not weighed results, and the input that decides them, how many degrees a covered tub warms between sessions, is the measurement this page most needs. The claim that a sealing lid roughly halves hold-mode energy is the one number on this page most worth measuring and the one we would least like you to quote as ours. Tub and chiller prices are retailer listings checked September 2026, the Redwood tubs 17 October 2026, the Ice Barrel 300 and the Plunge 18 October 2026. Our how we test page says the same about every figure on the site.

Total cost of ownership, three years

Rough scenarios for a three-times-weekly habit, equipment plus running:

Ice route: $2,700 tub + roughly $3,000–$8,000 of ice for a covered tub re-cooled 3 to 8°F a session = $5,700–$10,700, or nearer $20,600 if you refill from tap

Staged chilled route: $1,149.99 ported tub + $1,000–$3,000 standalone chiller + $450 circuit + power and maintenance = roughly $2,950–$5,650

Thermowood chilled route: $6,999 all-in-one + $450 circuit + power and maintenance = roughly $7,800–$8,500

Premium chilled route: $9,990 integrated + $450 circuit + power and maintenance = roughly $10,800–$11,500

At three sessions weekly, staging a chiller onto a tub with ports is the cheapest way to own this over three years, and the only chilled route that reliably beats ice. The two integrated tubs land inside or above the ice range. What they buy is not having to plumb, size or house a separate chiller, not a lower bill. Until 17 October 2026 this page put a $4,499 Redwood all-in-one in the middle row and called it the cheapest route; Redwood’s listing shows $6,999, and the arithmetic moved with it. On 18 October 2026 the Plunge moved from $8,490 to $9,990 (the $8,490 was a different Plunge model) and the ice figures were rebuilt on the calculator.

The two integrated tubs head to head, on equipment and on what each one costs to hold at temperature: Plunge All-In Gen 2 vs Redwood Alaskan All-In-One. The thermowood one in full: Redwood Alaskan cold plunge review.

Full product rankings: the best cold plunge tubs of 2026.