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You’ll still need to flush the group on a dual-boiler R58 as it uses the ancient e61 grouphead design which cools down and robs heat from the water when it’s been idling. I used to use the multi-boiler R8 commercial machine and even that couldn’t manage temperature, I always pulled a shot into the drip tray after it had been idling which is worse than just pulling a cooling shot on a hx, hence why it got updated to a saturated group, La Marzocco style.
Tl;dr: water wastage issue is moot.
Stevethecoffee
TTM
Nice choice to make.
I'm no expert, but have been reading up recently as I'm looking to purchase soon myself.
The main difference between the two machines is that the Apartment is a HX and the R58 a dual boiler. In case you haven't, it's worth having a read about the difference between the two and the pros and cons.
I found this useful -
https://www.bellabarista.co.uk/coffee-machine-guide
If it were my choice, I'd go dual boiler R58 as I use bottled water and would be unhappy with the waste involved with cooling flushes on a HX. I also think they're more stable in terms of temperature.