The 2 person infrared sauna is the volume seller of the whole home sauna market, and for good reason: it fits a spare room or a garage bay, it runs on a standard circuit in most cases, and it is the smallest size you can comfortably lie down in. It is also where the specification differences between cheap and good are easiest to see.
Does it seat two
Two people sitting upright, yes, shoulder to shoulder. One person lying down, usually. Two people lying down, no. Makers measure the bench, not the comfort, so read the internal width and depth rather than the seat count, and check whether the bench is a single run or a corner that loses usable length.
Panel coverage is the specification
The number that matters is how much of the wall area carries emitters and where they sit. A cabin with panels only behind the bench warms your back and leaves your front cool. Look for front, side and floor or calf panels, and for the panel area as a figure rather than a total wattage, which tells you little on its own.
Power and siting
Most two seat infrared cabins draw within an ordinary household circuit, which is the main practical advantage over traditional at this size. Confirm the amperage and whether the maker wants a dedicated circuit. They are light enough for an upper floor, but they are bulky to move, so measure the doorways and stair turns before ordering.
What separates cheap from good
Joinery you can see, a door that seals, a control that does what it says, and a maker that states EMF as a measurement rather than an adjective. Cheap cabins cut on panel area first and glass quality second. A warranty that covers the panels, not just the shell, tells you what the maker expects to fail.
Questions people ask about 2 person infrared sauna
Can two people really use it at once?
Sitting up, comfortably. Lying down it is a one person cabin. Check internal dimensions rather than the advertised seat count.
Does it need a special circuit?
Usually not, though many makers ask for a dedicated one. Check the stated amperage against your panel before buying.
Is full spectrum worth paying for at this size?
Only if you want near infrared specifically. A well panelled far infrared cabin at the same price is usually the better buy.