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.
If you have considered upgrading your tank size from 40- or 50-gallons to 66- or 80-gallons, we strongly recommend a tankless hot water heater. While traditional hot water tanks are compared based on gallon capacity, recovery rate and first hour rating, tankless hot water heaters are compared based on flow rate. As long as the home uses hot water at a flow rate below the tankless heaterâs maximum flow rate, there is no ârecoveryâ. For practical purposes, first hour usage is unlimited. Flow rate for a tankless water heater is measured in gallons per minute, based on a given heat rise (typically 25 or 50 degrees) and range from 4 gallons per minute to 8 gallons per minute. A unit that heats 4 gallons per minute can handle a shower plus one appliance operating at the same time.