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.
It could be from a number of reasons. Normally, hot water pressure out is determined by the pressure of the cold water going in, of course. However, excess floating scale and debris from the inside of the water heater could have clogged the various hot water sides of faucets, washing machine mixing valve, etc. Usually, you can hear this debris bubbling when the heater is on.