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.
Hot water demand pumps that require activation each time they are used work with both storage water heaters and tankless water heaters. Tankless hot water heaters typically take 10 to 20 seconds longer to deliver hot water to the faucets than a storage heater. The tankless water heater has to first heat the water requiring the water to pass completely through the heat exchanger before fully hot water begins its way to the fixture whereas with the storage heater the hot water is waiting and ready to go instantly when the fixture Is opened.