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@therealtorte, not a pool expert. Hopefully, experienced E+ pool/plant users can chime in.

I simply replaced the water heater with an autosized gas-fired boiler:

Seems to do the trick (water temperature ~27°C). Supply temperature is always coming out at 35°C, despite resetting some of the scheduled values (I must be overlooking something).

@therealtorte, not a pool expert. Hopefully, experienced E+ pool/plant users can chime in.

I simply replaced the water heater with an autosized gas-fired boiler:boiler. Seems to do the trick (pool water temperature at a constant ~27°C).

Seems to do the trick (water temperature ~27°C). Supply temperature is always coming out at 35°C, despite resetting some of the scheduled values (I must be overlooking something).

Tested against a much colder climate, the boiler/loop is supplying ~75°C and meeting the target 27°C. If you're investigating the impact of water temperature setbacks or flush + maintenance + refill + re/heat scenarios, then adjust the Loop Design Temperature Difference, e.g. (75°C - 10°C =) 65K rather than (75°C - 27°C =) 48K. This would level up the (autosized) maximum flow rate.

You need both a high supply temperature and adequately-sized flow rate to melt that 4 months (!) reheat period down to hopefully a few days. The nearest olympic/competition swimming facility states that it takes 6 days to refill the pool (e.g. maintenance), and up to 3 days to reheat to 28°C.

Best of luck.

@therealtorte, not a pool expert. Hopefully, experienced E+ pool/plant users can chime in.

I simply replaced the water heater with an autosized gas-fired boiler. Seems to do the trick (pool water temperature at a constant ~27°C).

Supply temperature is always coming out at 35°C, despite resetting some of the scheduled values (I must be overlooking something). EDIT: Had skipped over the Plant:Loop settings, where the max loop T° was originally set at 35°C. If you ensure supply temperature settings at e.g. 75°C (boiler, loop, setpoint manager schedule "Sciorba Temperature AC Vasca"), then the average average flow rate will drop.

Tested against a much colder climate, the boiler/loop is supplying ~75°C and meeting the target 27°C. If you're investigating the impact of water temperature setbacks or flush + maintenance + refill + re/heat scenarios, then adjust the Loop Design Temperature Difference, e.g. (75°C - 10°C =) 65K rather than (75°C - 27°C =) 48K. This would level up the (autosized) maximum maximum flow rate.

You need both a high supply temperature and adequately-sized flow rate to melt that 4 months 4-month (!) reheat period down to hopefully a few days. The nearest olympic/competition swimming facility here (cold climate) states that it takes 6 days to refill the pool (e.g. maintenance), and up to 3 days to reheat to 28°C.

Best of luck.

@therealtorte, not a pool expert. Hopefully, experienced E+ pool/plant users can chime in.

I simply replaced the water heater with an autosized gas-fired boiler. Seems to do the trick (pool water temperature at a constant ~27°C).

Supply temperature is always coming out at 35°C, despite resetting some of the scheduled values (I must be overlooking something). EDIT: Had skipped over the Plant:Loop settings, where the max loop T° was originally set at 35°C. If you ensure supply temperature settings at e.g. 75°C (boiler, loop, setpoint manager schedule "Sciorba Temperature AC Vasca"), then the average flow rate will drop.

Tested against a much colder climate, the boiler/loop is supplying ~75°C and meeting the target 27°C. If you're investigating the impact of water temperature setbacks or flush + maintenance + refill + re/heat scenarios, then adjust the Loop Design Temperature Difference, e.g. (75°C - 10°C =) 65K rather than (75°C - 27°C =) 48K. This would level up the (autosized) maximum flow rate.

You need both a high supply temperature and adequately-sized flow rate to melt that 4-month (!) reheat period down to hopefully a few days. The nearest olympic/competition swimming facility here (cold climate) states that it takes 6 days to refill the pool (e.g. maintenance), and up to 3 days to reheat to 28°C.

Best of luck.

@therealtorte, not a pool expert. Hopefully, experienced E+ pool/plant users can chime in.

I simply replaced the water heater with an autosized gas-fired boiler. Seems to do the trick (pool water temperature at a constant ~27°C).

Supply temperature is always coming out at 35°C, despite resetting some of the scheduled values (I must be overlooking something). EDIT: Had skipped over the Plant:Loop settings, where the max loop T° was originally set at 35°C. If you ensure supply temperature settings at e.g. 75°C (boiler, loop, setpoint manager schedule "Sciorba Temperature AC Vasca"), then the average flow rate will drop.

Tested against a much colder climate, the boiler/loop is supplying ~75°C and meeting the target 27°C. If you're investigating the impact of water temperature setbacks or flush + maintenance + refill + re/heat scenarios, then adjust the Loop Design Temperature Difference, e.g. (75°C - 10°C =) 65K rather than (75°C - 27°C =) 48K. This would level up the (autosized) maximum flow rate.

You need both a high supply temperature and adequately-sized flow rate to melt that 4-month (!) reheat period down to hopefully a few days. The nearest olympic/competition swimming facility here (cold climate) states that it takes 6 days to refill the pool (e.g. maintenance), and up to 3 days to reheat to 28°C.

Best of luck.

EDIT: @therealtorte, I'm coming up empty handed with your 2-pool configuration - sorry. Switching to constant flow rates (with a bypass), adjusting loop volumes, hard sizing, etc.; results remain as you observed (the deeper pool remains cold, while the shallower pool meets the setpoint). This may be a bug, possibly related to this recent fix for E+ 23.2 (still an issue?), or related to this. I suggest you triple-check to make sure the inputs to the main (2m-deep) pool/loop/boiler are the same between both models you have submitted (I noticed the "Sciorba "Sciorba Temperatura AC Vasca" Vasca" values may have been different), and consider submitting an issue (while referring to this UMH post). Alternatively, you could try hard sizing EVERY input related to the pools, loops, boilers (i.e. no autosizing). Buona fortuna!