Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
Rinnai tankless gas water heater sizing charts

bob eck
Member Posts: 930
Where can I get sizing charts for Rinnai tankless gas water heaters. Thanks Bob
0
Comments
-
For residential Rinnai TGWH units0
-
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
"If you can't explain it simply, you don't understand it well enough"
Albert Einstein0
Categories
- 120.9K All Categories
- 83.8K THE MAIN WALL
- 2.8K A-C, Heat Pumps & Refrigeration
- 53 Biomass
- 416 Carbon Monoxide Awareness
- 36 Chimneys & Flues
- 1.7K Domestic Hot Water
- 4.7K Gas Heating
- 116 Geothermal
- 154 Indoor-Air Quality
- 2.9K Oil Heating
- 49 Pipe Deterioration
- 754 Plumbing
- 5.3K Radiant Heating
- 358 Solar
- 13.9K Strictly Steam
- 3K Thermostats and Controls
- 50 Water Quality
- 37 Industry Classes
- 70 Job Opportunities
- 14 Recall Announcements