Don't mind me posting the questions u PM me over here so everyone can see
Q1. 517 is in fact an older model than 516 and 518 (don't ask me why, small potato like me can't question the decisions of our HQ

) So it's been phased out
So let's just focus on 516 and 518

They only have 3 differences, both model
same price:
1) 518 has 10ml volume control (between 120~1000ml, i.e. 120, 130, 140, 150 all the way to 1000ml as u like), 516 can use the preset 120, 250, 500 and 1000ml only
2) 518 has favourite presets - Can set 3 favourite presets, (i.e. Preset A = 120ml 40°C say for baby formula, Preset B = 270ml 85°C for coffee, Preset C = 620ml normal temperature for water bottle etc.), 1 button to change both volume and temperature that you use most frequently
3) 518 water tap cannot move 180° horizontally like 516 can, due to it being square design, but can still be installed horizontally, just that once installed cannot move the tap as u like
516 water tap can move horizontally as desired, i always use vertical for cup then swing it to the right when i fill up my bottles/cooking pot
Q2. Monthly rental for self-service is RM60 or RM90, regular visit is RM80 or RM110 depend if u take 5 or 7 yrs contract
Q3. Our pricing can be confusing sry bout that
If rental customer need to choose 2 things:
1) Choose 5 or 7 yrs contract
2) Choose self-service or regular visit
Self-service is very easy, also cheaper, so always recommended
unless at home no one knows how to change filter (says elderly ppl, OKU etc.)
Personally i recommend 7 yrs self-service:
1) The machine is tankless, so don't need technician visit to clean the tank anyway, so LG designed the machine with self-service functions, customer just change the filter then the machine will flush the new filter automatically, also can clean it more frequently unlike technician only visit every few months
2) Cheaper than regular visit, even cheaper if take 7 yrs
3) 5 yrs contract is more expensive overall, cuz at 3rd year it gives u an option (to return the unit, keep using the unit or upgrade to a newer model).
But i think is unnecessary, we are alrd offering what LG Korea have except 1 model where they add voice control to 518, which i cant think of a scenario for it to be useful (mayb put a cup there and run far far away then shout "dispense water"?

)
Q4. Both filters and warranty are covered during the whole 5/7 yrs, if rosak, LG fix for u completely free, compressor warranty even longer at 10 yrs
Q5. Yes, after rental period ends, you own the machine and can continue use it, just buy filter package will do (but no more warranty ya)
Jiksoo Hyper is using sus304 internal + UV light for output but no hot water sterilisation of internal piping available.
Also monthly rental for Hyper is RM79/month for quarterly visit + Filter over 7 years, which makes its overall cost to be about 6k+ range.
LG does self sterilisation on weekly basis and on demand as required on top of the hourly UV light sterilisation. Which can be viewed and control using the LGThinQ app.
Also, so far in the market, if I'm not mistaken up to now, only LG has inverter compressor for cold water. The rest are still using the non inverter compressor. And this translates to overall energy savings.
Hyper definitely not using inverter compressor.
That being said, do test and try out the water first before deciding on your water purifier. Design is part of the equation, but the water output which you drink should be the ultimate method to make a decision.