The GreenHouse Plus offers all the features of the original GreenHouse but with increased volume and a single combined reflux and additions head... The GreenHouse Plus provides 24 heated and stirred glass reaction positions able to accommodate reaction volumes from 0.5ml to 7ml. A new combined reflux and additions head allows for convenient additions or withdrawals whilst maintaining an inert atmosphere and efficiency The patented GreenHouse Plus brings all the benefits in productivity of parallel synthesis at a fraction of the cost of automated systems. Holding 24 glass reaction tubes in a removable reaction block with the same footprint as a standard micro titer plate the GreenHouse Plus facilitates rapid transfer of samples by multi-channel pipettor or robotic systems.