I am using alpha s series, less than 2 years and start to have problem, the pump will shut off during shower and always need to reset and still won't work. It's rather expensive compared to some other brands but prrformance wise below expectation. Not sure if it's the incoming water pressure or the unit itself. Not sure if it's still safe to use.

Went to the shop i bought it from, they said will send the service guy but never turned up. Don't know if they did or not, so i don't have faith in alpha anymore. Gonna move out in a few months or i dont plan to install a new one.

I should do that, thanks.