Hi bro, 516 outright price is RM3200 ya, 216 is the one at RM2800, 216 is 100% same as 516 except no cold water

But i recommend u consider rental again cuz if rental 516 is the one with promo price, then over 7 years ur cost is only RM210 diff compare to u buy 216 outright then buy 5 yrs service package, in short u pay extra RM210 u get cold water and 5 more yrs warranty (average 1 year only pay extra RM30)

Hot water can damage filters that are not designed for it. Yes LG internal pipes are all stainless steel and there's hot water flushing internal pipes every week, but these water doesn't pass thru the filter and is solely used for flushing, hence is alright, but if for drinking, the water must pass thru the filters to get filtered, then they could potentially damage the filters.

We need to know how hot is the water coming in before we can conclude ya, LG filters can go up to 45°C max, u got try test the water temperature coming in?

Yes, absolutely. Hot water disactivates carbon very very quickly. Even regular tap water in Malaysia requires shortened change intervals, if your water is abnormally hot, it will be an issue without any doubts and that will apply to any carbon based filter. You need KDF instead of carbon and the cartridges designed for hot water. What you could do, however, is to have a mini tank before, where the water would cool down. Why is your tap water so hot anyway? Pipes exposed to direct sunlight all along?