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.
For our solar pool project, we wanted to calculate the Gallons Per Minute (GPM) Flow Rate that our 12 Volt pump was producing. As well, we found out what the... For our solar pool project, we wanted to calculate the Gallons Per Minute (GPM) Flow Rate that our 12 Volt pump was producing. As well, we found out what the temperature of the first gallon would be coming directly from the solar water heater. To Calculate GPM, we used the following formula.. (Number of gallons filled / Time in seconds to fill gallon) x 60 So in our case, we end up with the following equation= 1 gallon / 23 seconds = 0.0434, 0.0434 x 60 = 2.604, or roughly 2.6 GPM The pump produced 2.6 GPM of 113F water to our pool from the solar water heater, in the first gallon.