Thank you Martinm210, power draw figures are in line with my measurements. Personally I prefer the D5 or DDC though, the imo misleading advertisement (6 m, 17 W) really annoys me and the few loops i build with the 1500 and 1510 were all run at 12-15 V in the end as customers found noise on the higher levels unacceptable (they wanted WC for a quiet system in the first place).