I, random person on internet, highly recommend resmed airsense. Make sure it’s apap model. Their naming schemes are confusing. I’ve used Phillips and resmed and resmed is so much nicer in every way.
But wait, there's more. Each insurer had a different schedule for how often you should change the tubing, mask, hose and filters. I have boxes of spare parts because I would not replace per the insurer's schedule. I always replaced the air filters, always used distilled water and cleaned, but never placed a tank. The mask and hose are sturdy, so I clean and reuse until they leak too much.
I sealed mine with food-grade silicone as fellow users in the internet suggested, and it's been good since.
The water tank for the AirSense 11 is something like $29 and it's a consumable item that's covered by your insurance. I just get a new one every six months.
Been using for about 5 months now and it's been great