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Rinnai tankless gas water heater sizing charts
bob eck
Member Posts: 921
Where can I get sizing charts for Rinnai tankless gas water heaters. Thanks Bob
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Comments
The sizing (GPM output) is just a function of BTU output and delta t.
BTU/delta t/500 = GPM
If you have a 200,000 BTU/hr 90% efficient unit with incoming water at 50 and outgoing water at 120, the math would look like this:
200,000*.9 =180,000
180,000/70/500 = 5.14 GPM
Albert Einstein