ORH18MR - Heating Rinnai - Free user manual and instructions
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| Type of Product | Gas Wall Furnace |
| Brand | Rinnai |
| Model | ORH18MR |
| Energy Source | Natural Gas or Propane |
| Heating Capacity (Input) | 18,000 BTU/h |
| Efficiency | Up to 82% AFUE |
| Dimensions (W x H x D) | 17.7 x 23.6 x 8.3 in (450 x 600 x 210 mm) |
| Weight | 33 lbs (15 kg) |
| Control Type | Thermostat with Remote Control |
| Venting System | Direct Vent (Sealed Combustion) |
| Installation Type | Wall Mounted |
| Safety Features | Oxygen Depletion Sensor, Flame Failure Safety, Overheat Protection |
| Maintenance | Annual professional inspection; clean burner and vent periodically |
| Warranty | 5 years on heat exchanger, 2 years on parts |
| Power Supply | 120V AC for controls (included transformer) |
| Certifications | ANSI Z21.88, CSA 2.33 |
| Room Coverage | Up to 600 sq ft (approx.) |
| Ignition | Electronic Ignition (Hot Surface) |
Frequently Asked Questions - ORH18MR Rinnai
What type of gas does the Rinnai ORH18MR use?
The Rinnai ORH18MR is designed for natural gas but can be converted to propane with a conversion kit.
How do I clean the burner on my heater?
Turn off gas and power, remove the front panel, and gently vacuum the burner ports. Use a soft brush to remove debris. Reassemble and test.
What does the error code E1 mean?
Error code E1 indicates a flame failure. Check gas supply, igniter, and flame sensor. Reset the unit and try again.
Can I install the ORH18MR myself?
Installation should be performed by a qualified professional to ensure proper venting and gas connections. Incorrect installation can be dangerous.
What is the recommended maintenance schedule?
Annual inspection by a technician is recommended. Clean the burner and vent before each heating season.
How do I adjust the thermostat?
Use the remote control or the onboard thermostat to set the desired temperature. The unit will automatically modulate to maintain it.
Is the ORH18MR energy efficient?
Yes, it has an AFUE rating up to 82%, meaning 82% of the fuel is converted into heat, making it moderately efficient.
What should I do if the heater doesn't start?
Check that the gas valve is on, the thermostat is set above room temperature, and the power cord is plugged in. If still not working, call a technician.
Does this heater require a chimney?
No, it uses direct vent technology, which draws air from outside and exhausts through a wall terminal. No chimney needed.
Where can I find replacement parts?
Contact Rinnai customer support or an authorized dealer. Common parts include thermocouple, igniter, and fan motor.
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USER MANUAL ORH18MR Rinnai
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Product information
Brand : Rinnai
Model : ORH18MR
Category : Heating