Households that ask about reverse osmosis versus distilled water have usually already accepted that both produce very low mineral water. What settles the choice a year later is none of that: it is how much you get per day, what you have to remember to do, what it costs to run, and where the water sits between the machine and the glass.
Daily volume, and where it comes from
Reverse osmosis stores treated water in a small pressurized tank and refills it whenever the tank drops, so the supply is there when you want it and recovers on its own. A distiller gives you the size of its jug, then stops. Households that cook with treated water, fill bottles and run an ice maker find the refill rate matters far more than any lab comparison of the two methods.
The maintenance you will actually do
Reverse osmosis maintenance is calendar based: change the sediment and carbon prefilters on schedule, the postfilter with them, and the membrane when performance drops. Distiller maintenance is use based: descale the boiling chamber before the deposit hardens, and replace the carbon insert. Be honest about which pattern fits you, because both systems degrade silently when the household stops keeping up.
Energy and water use
A distiller boils every drop it produces, so its running cost is electricity, and the kitchen warms up while it works. Reverse osmosis uses household pressure rather than power, but sends a share of the feed water to the drain along with the rejected salts. Neither of these is likely to change your decision on its own, but they point in opposite directions if either utility is expensive where you live.
Storage and taste
Reverse osmosis water is drawn fresh from a sealed tank through a dedicated faucet, so it stays covered from membrane to glass. Distilled water sits in an open-mouth jug you handle and refill, which is where flavor from the container and recontamination can creep in. Both taste flat by design; if that bothers you, a remineralization cartridge on a reverse osmosis outlet is the easier fix.
Questions people ask about reverse osmosis versus distilled water
Which one is better for a family of four?
Reverse osmosis, in almost every case. Batch distillation cannot keep pace with drinking, cooking and ice for four people without constant attention.
Which is better if I rent and cannot alter the plumbing?
A distiller, or a countertop reverse osmosis unit. Both plug in and need no drain connection, faucet hole or permanent tap into the cold supply.
Do I need to add minerals back to either one?
Not for safety. People add minerals for taste and for better coffee extraction, and reverse osmosis systems offer a cartridge that does it automatically.