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.
The water heater is rated at 11,000 to 199,000 Btu/hour gas input, has a maximum hot water delivery (at a 45Â°F temperature rise) of 8.4 gpm, and has a minimum flow rate of 0.26 gpm. There are two primary types of water heaters: storage and tankless.n the case of electric storage tank water heaters the wall loss is less than 10% of total water heater energy use. Conventional gas fired storage water heaters DO have very high standby losses, but that has little to do with tank wall insulation but LOTS to do with convective loss up the central flue.