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.
High flow rates over long periods of time can cause pipe erosion in the piping and especially in elbows and T fittings. Typically building codes limit the water velocity in hot water piping to 5 to 8 feet per second to prevent erosion of the pipe and fittings.Five feet per second is moving right along. At that velocity the hot water should reach a fixture connected to the water heater with a 100 foot pipe in about 20 seconds..74. 1.93. If your pipe is 3/4, then at 5 gallons per minute the flow rate would be 3.29 feet per second, so a 100 foot long pipe would require about 30 seconds. If the pipe was 1/2, then it would only take about 15 seconds to get the hot water through the 100 foot long pipe.