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.
Before we can determine what heater you need you must obtain the following information. 1. Temperature of your incoming water/fluid on the coldest day of the year. 2. Temperature of the water/fluid you want to use. 3. How much water/fluid you need per minute or hour. Once the above information is available you can select the size heater you need from the recovery chart below by doing the following; 1. Subtract the inbound fluid temperature from the temperature you need to obtain Temperature Rise.