Most people believe that if something costs more, it has to be better quality. In the case of generic drugs, this is not true, says Gary Buehler, Director of FDA's Office of Generic Drugs. The standards for quality are the same for brand name and generic products..uch of FDA's review of generic drugs and brand name drugs is the same, Buehler explains (See Same FDA Requirements for Brand-Name and Generic Drugs below).
Then evaluate tank water heaters on the same gph basis to determine how many gallons of storage are needed to meet this demand. While tankless water heaters do not run out of hot water, if not sized correctly, the flow rate of that water can be adversely impacted.
Single-DuctVAV-PRC008-EN SD 7 PerformanceDataâAir PressureRequirements Note: Hot water pressure drops are for the entire unit, not just the coil. To calculate the hot water coil only pressure drop, subtra ct the cooling only pressure drop from theother pressure drop.xample: VCWF, Hot Water Unit Heat, Size 12(See air Valve Selection)Heating airflow: 850 cfmHot water flow: 1.0 gpmDesign Heat Loss: Q =25 MBhSelect hot water coil from the coilperformance table in the PerformanceData section of the catalog.Selection:A one-row coil is sufficient to meetdesign conditions.