Sun Home manufactures the saunas and cold plunges named in this guide. Specifications and prices were checked against the sources named in the Methodology and Sources section on September 22 and 23, 2026; "not found" means the figure was not found in those sources on those dates, not that it does not exist. Figures are labeled manufacturer specification, calculated from stated inputs, or illustrative assumption where the difference matters.
Short Answer
Plan an indoor cold plunge around its operating weight, actual floor support, chiller airflow, moisture control, drainage route and electrical requirements. Check the exact model's manual and your room conditions before delivery. Filled-weight calculations help you ask an installer or structural professional the right questions; they do not approve a floor or establish a universal room layout.
Key Takeaways
- Operating weight is dry weight plus water plus bather. A Cold Plunge Pro is about 400 lb dry and roughly 1,650 lb with 150 gallons; Sun Home publishes a supporting capacity for the Apex rather than a filled weight (see the table), so confirm it before planning.
- A room name is not a floor rating. Slab-on-grade rooms usually carry a tub without question, but the slab, its condition and the tub's contact points still need a look; framed floors need a structural professional.
- The chiller moves the water's heat into the room. Sun Home's published 2,600 W cooling and 1,150 W input add to about 3,750 W of gross heat rejection while the compressor runs at compatible conditions; the room's net gain over a day is a different and smaller number.
- Puddles have four possible sources: condensation, splash-out, drainage and a leak. No short waterline test rules a leak out; stop use and follow the support procedure when the source is uncertain.
- Drain to a locally permitted route for the water treatment you use, on a dedicated GFCI-protected 120V circuit within the cord's reach, and keep any sauna at least 5 ft away per Sun Home's warranty.
Verified Operating Weights
| Model | Dry weight (manufacturer) | Water at listed volume (calculated at 8.34 lb/gal) | Operating example with one 200 lb bather (calculated) | Footprint (manufacturer) | Evidence status |
|---|---|---|---|---|---|
| Cold Plunge Pro | 400 lb | 150 gal = 1,251 lb | About 1,851 lb | 78.7 x 33.5 in exterior (about 18.3 sq ft) | Dry weight, volume and footprint from Sun Home pages; contact points (six casters) per product page |
| Cold Plunge Pro Apex | 528 lb (product page "tub weight") | 180 gal = 1,501 lb | About 2,229 lb | 71.5 x 30.75 in exterior (about 15.3 sq ft) | Sun Home asks for a floor or pad that can support over 2,500 lb, including the filled plunge and bather, a safety margin rather than an operating weight. Ask Sun Home support for the operating weight before planning |
| Cold Plunge Horizontal | 15.5 lb tub plus 88 lb chiller (separate) | 128 gal = 1,068 lb | About 1,284 lb on the tub footprint | 6.4 x 2.3 ft | Manufacturer specification; chiller stands beside the tub |
A brim-full volume plus a full bather overstates the normal case slightly because a bather displaces water; use it as a conservative planning example, not an engineered design load. Weight divided by footprint (about 90.2 lb per sq ft for the Pro with water alone, about 101.1 lb per sq ft with the 200 lb bather, across its 18.3 sq ft footprint) tells you the load is concentrated, not whether a given floor accepts it.
Room Suitability: What Each Room Type Needs Checked
| Check | Garage | Basement | Finished room on a framed floor |
|---|---|---|---|
| Floor support | Usually a slab on grade; confirm it is, and that it is sound and level | Usually a slab; confirm, and check for a sump, cracks or a raised subfloor | Structural professional reviews joist span, orientation, condition, support and existing loads against the operating weight and contact points |
| Chiller airflow | Watch summer heat; keep intake and exhaust clear | Cool but often humid; plan dehumidification | Heat and noise enter living space; plan airflow and placement |
| Moisture | Tolerant surfaces; still control humidity to protect the unit | Highest condensation risk; dehumidifier likely | Protect flooring; containment mat and dehumidification |
| Drainage | Floor drain or pump to an approved route | Floor drain, sump or pump to an approved route | Pump out to an approved route; no floor drain usually |
| Electrical | Dedicated GFCI-protected 120V circuit per the manual | Same | Same; receptacle outside the splash zone |
The Five Systems to Plan
1. Heat rejection and airflow
A chiller removes heat from the water and rejects it, plus its own electrical input, into the room. Using Sun Home's published Pro ratings, that is about 2,600 + 1,150 = 3,750 W of gross rejection while the compressor runs at compatible conditions. The room's net gain over a full day is lower: the compressor cycles, and some of the heat removed from the water entered the water from the same room. Do not size HVAC from an unqualified 3,750 W figure; give an HVAC contractor the ratings, the duty cycle you expect and the room volume. Keep the intake and exhaust grilles clear per the manual (Sun Home's Apex guidance lists 36 in at the stairs/chiller-grille end and the control-panel side, and 12 in at the opposite long side and the well end).
2. Moisture
Any surface colder than the room's dew point sweats. At 70°F and 60 percent relative humidity the dew point is about 55°F, so uninsulated hoses and fittings carrying 40°F water will drip; the Pro and Apex use foam-injected insulation between tub and shell, which keeps most of the exterior above dew point. Opening a window helps only when the outside air is drier; humid outside air makes condensation worse. Dehumidification, insulation on hoses, a containment mat and a lid are the controls that work in a closed room.
3. Water on the floor
Water may come from condensation, splash-out, draining or a leak. If water is near the receptacle, cord, control panel or chiller compartment, or the flow is more than a film, do not touch the unit, its controls or the plug. Cut power at the circuit breaker or a disconnect only if it is in a dry place you can reach without standing in water, with dry hands; otherwise leave everything alone, keep people away and call a licensed electrician. Do not restore power until an electrician has checked the equipment, then contact Sun Home support. If the electrical side is dry and the water is a small amount on the floor, you may switch off at the control panel and unplug with dry hands, then follow the support procedure. A stable waterline over a few hours is a clue, not proof: some leaks only occur when the pump runs and small leaks escape a short test. Sun Home support uses the same procedure.
4. Drainage and refill
Sun Home's plunges fill from a hose and drain through a valve or pump. Where 150 to 180 gallons go is a local question: a floor drain, sump or sanitary connection is usually acceptable, while discharge to a driveway, lawn or storm drain depends on your municipality and on the treatment chemicals in the water. Use only approved water treatments and check the local rule before the first drain.
5. Electrical
Sun Home publishes a 12 A operating draw for the Pro and Apex on a dedicated 120V, 15 A GFCI-protected circuit with a standard NEMA 5-15 plug and an 8 ft cord; the Titan lists the same dedicated 15 A GFCI circuit and plug; the Performance Series specifies 110 to 120V with GFCI protection. The draw and the circuit rating are different numbers, and the electrician works from the circuit rating. Have an electrician place the receptacle where the cord reaches without an extension and outside the splash zone; the manual and the electrician's design govern heights and distances, not this article. If a sauna shares the room, keep it at least 5 ft from the plunge: Sun Home's warranty page voids sauna coverage for a cabin placed closer than five feet to a cold plunge, shower or hot tub.
Illustrative Layout: A Basement Corner
This example is a sketch to prompt questions, not an installation approval. Tub along the long wall with the manual's service clearances kept free on the chiller and access sides; a containment mat extending past the entry side; a dehumidifier draining to the same drain the tub uses; the dedicated GFCI receptacle placed by the electrician outside the splash zone; the room door open during the first pull-down and a supply of drier air afterward. Replace every dimension with the manual's figures and the installer's plan.
Delivery Checklist
- Model, generation, dry weight, volume and contact-point layout confirmed with Sun Home support.
- Floor type confirmed (slab on grade or framed) and, for framed floors, a structural professional's review of the operating weight and contact points.
- Drain route confirmed with the municipality for the treatment used.
- Dedicated GFCI-protected circuit installed per the manual; receptacle within cord reach.
- Dehumidification, containment mat and hose insulation on hand before the first fill.
- Route from the door to the room measured against the unit's exterior dimensions; six casters on the Pro help, but stairs still need carriers.
Bottom Line
Treat the filled-weight table as the list of questions for your installer and structural professional, plan airflow and dehumidification from the published ratings rather than a single watt figure, confirm the drain route locally, and put the plunge on its own GFCI-protected circuit at least 5 ft from any sauna. Confirm the Apex operating weight with Sun Home before planning that model.
Frequently Asked Questions
Does the chiller warm the room?
Yes. It rejects the heat it removes from the water plus its electrical input; Sun Home's Pro ratings add to about 3,750 W while the compressor runs at compatible conditions. The daily net gain is smaller and depends on duty cycle.
Can a framed floor carry a cold plunge?
Only a structural professional can say, from the operating weight, contact points, joist span and condition. Weight divided by footprint does not answer it.
How do I plan a drain without permanent plumbing?
Pump or gravity-drain to a floor drain, sump or sanitary connection that your municipality permits for the treatment used. Confirm before the first drain.
Does a dehumidifier stop every puddle?
No. It controls condensation. Splash-out, drainage and leaks need their own answers, and an uncertain source means stop use and contact support.
Methodology and Sources
Dry weights, volumes, footprints, clearances, chiller ratings and electrical requirements were read on Sun Home's product and help-center pages on September 22 and 23, 2026; dry weights, footprints and clearances use Sun Home's current product record. Water weights use 8.34 lb per gallon; operating examples add a 200 lb bather and are labeled calculated. The dew point example uses a standard psychrometric approximation. No room in this article is presented as approved. Sun Home manufactures the products named.
- Sun Home Cold Plunge Pro help center
- Sun Home Cold Plunge Pro Apex help center
- Sun Home cold plunge setup guide
- Sun Home warranty information (5 ft separation)
- Best flooring options for saunas and cold plunges