The POU 3.5 is a true point-of-use model. It has a slightly less heating capacity than the POU 6. It has a maximum flow rate of 0.5 gpm and includes a 0.5 gpm sink aerator. This product is recommended for use with a single sink only. Do not use with a shower or multiple fixtures. Use the ECOSMARTâ„¢ interactive sizing guide to find out which model is ideal for you.