Does the 20-pound capacity mean I can wash a 20-pound load?
No, and this is the most common misreading of the machine. COSTWAY splits the 20 pounds across two separate tubs: 12 pounds on the wash side and 8 in the spinner. They are not one drum, so a full wash is moved across to the spinner in batches small enough for it to balance, often two or three. The wash tub also needs room for water to move the clothes; packed to the brim, the clothes do not move and water can seep from the seam. Think of it as a machine for a few days of clothes or a set of sheets at a time.
Do I need a proper washer hookup, or will a sink and a bathtub do?
A plug, a way to fill it and somewhere lower to drain are the whole requirement. It is freestanding and runs on standard 120 volt household power, so no plumbing work is involved. COSTWAY supplies an inlet hose kit and notes that a faucet adapter may be needed; the hose is often short or a poor fit, and a detachable shower head or garden hose works better. It drains by gravity, so the end of the drain hose has to sit lower than the machine, which is why the bathtub is the usual spot. At 14 by 25 by 28.5 inches and 29 pounds, one person can lift it in and out.
How much of the work do I still have to do myself?
Most of it. Semi-automatic means the machine agitates and spins, and you handle everything in between. You fill the wash tub, set the wash timer, drain it, refill to rinse, then lift the wet load into the spinner and set that timer separately. Three knobs, a wash selector and two timers, are the whole interface, which makes it easy to learn, though it is plainly manual work. If you want to start a load and leave the house, this is the wrong machine. If you are nearby anyway, the timers let you stop the moment clothes look done.
Can I wash in warm or hot water?
Only by supplying it. The machine washes in whatever water you put in, and it is not built for hot water loads. Warm water from the tap or a shower head suits most laundry, and liquid detergent dissolves more easily than powder in cooler water. Do not pour boiling water into the plastic tub.
Why does the spinner rattle and walk across the floor?
An unbalanced load, nearly every time. The spinner works by throwing water outward, so a towel bunched to one side pulls the basket off centre, and a light plastic body has little mass to absorb that. Stop the spin, spread the load evenly around the basket, press it down with the cover, and restart, holding the machine steady as it gets up to speed. Noise is a mixed point at best, so expect it to be loud even when loaded properly. A level surface and a rubber or gym mat underneath help a lot.
What tends to go wrong, and how long should this last?
Durability is the soft spot: mixed rather than bad, with some machines running for months of regular use without trouble. COSTWAY lists a 6 month warranty, which is short for an appliance, so raise any fault early and keep your order details. The practical risks are water pooling under the machine, which can damage the motor if a bath drain is blocked, overfilling the wash tub, and spinning unbalanced loads. Treated as a light-duty machine, with moderate loads and the tubs drained after use, it repays what it costs.