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TTM
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.