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.
cwater = 1 calorie/gm Â°C = 4186 J/kgÂ°C = 1 BTU/lb Â°F. A typical U.S. residential water heater will be taken as one which has a capacity of 40 U.S. gallons (= 320 pounds, 145 kg, 151 liters). The typical heating range will be taken to be from 60 Â°F to 140 Â°F (15.6 Â°C to 60 Â°C). The energy required to heat the water can be determined from the specific heat relationship. Q = cmÎT. The energy required to heat one tank of water over the specified range is then (1 BTU/lb Â°F)(320 lb)(140Â°F - 60 Â°F) = 25,600 BTU. or