The manual provides safety information, operating instructions, maintenance procedures, error codes, and installation guidelines for Rheem 305, 505, and 705…
This operation and installation manual covers the Rheem Direct Vent Tankless Water Heater models 305, 505 and 705. It explains safety precautions, how the unit works, and how to set and adjust temperature settings.
Key sections include consumer safety information, operating instructions, maintenance steps, error‑code troubleshooting, detailed installation instructions (gas, water, venting), technical data, and warranty terms. The document is intended for qualified installers and end users who need to operate and service the heater safely.
| Minimum Gas Consumption (Btu/h) | 15,000 (305) / 19,000 (505) |
|---|---|
| Maximum Gas Consumption (Btu/h) | 180,000 (305) / 199,000 (505) |
| Hot Water Capacity (GPM, Min‑Max) | 0.6‑7.5 (305), 0.6‑9.4 (505), 0.6‑9.8 (705) |
| Efficiency Rating | 84 % |
| Noise Level | 49 dB |
| Electrical Consumption (Normal) | 65 W (305) / 79 W (505) / 99 W (705) |
| Weight | 50 lb (305) / 55 lb (505) |
Do not try to light any appliance, do not use any phone, and immediately call your gas supplier from a neighbor’s phone.
Press the “Priority button” on the temperature controller; the green Priority light will glow indicating the controller is active.
Error code 02 means no burner operation during freeze‑protection mode and requires a service call.
The appliance should be inspected annually by a qualified service technician.
This manual explains 11 error codes. Open a code for its meaning, causes and what to do: