Older British hot water systems, though perhaps not in clinics, were not potable water because they had a separate cold water header tank which was open. That filled the HW cylinder by gravity. There used to be separate taps instead of mixers to prevent anything from the HW going back into the mains cold water. In domestic settings the HW cold water feeder tank was often galvanised steel and often rusty, sometimes rats would nest on the lid and their excrement and urine would find it's way into domestic hot water. Chlorine was inevitably gassed off. The emergence of combi boilers removed the need for HW cylinders and header tanks and HW is now as good as direct mains water. Maybe it for that they don't supply to the UK. A unit with a tank and heating would be more appropriate for areas with poor water quality but then that brings extra cleaning and sterilisation demand because one is dealing with temperatures that don't lyse Legionella and might promote Oomycota and the like.

discontinued in my country

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Why? Don't we get water from the tap in our ears during a shower or bath? I've always used warm tap water when flushing ears. This is not a sterile peoceedure, so there's no need to use sterile normal saline.

There's not much between irrigating wounds with chlorinated tap water and normal saline so there's no reason to use saline here unless the tap water is manky with cryptosporidia (as was in NYC water) or whatever was in Flint, Michigan's water. It's just availibility or normal saline in primary clinical settings that leads to it's use. Perhaps in secondary healthcare setting saline would be more appropriate, what with nosocomial infectious agents around and longer pipe runs so more risk of water being lower quality. There's probably a model with a reservoir and heater (less water waste too) but that will bring more cleaning demand.