Rinnai Circ-Logic with Grundfos GTK03 Kit 8
Install the Rinnai Tankless Water Heater according to the Rinnai Tankless
Water Heater Installation and Operation Manual. The water heater must be
electrically grounded in accordance with local codes and ordinances or, in the absence of local codes, in
accordance with the National Electrical Code, ANSI/NFPA No. 70. Indoor water heaters are equipped
with a three-prong (grounding) plug for your protection against shock hazard and should be plugged
directly into a properly grounded three-prong receptacle. Do not cut or remove the grounding terminal
from this plug.
To protect yourself from harm, before installation:
• Turn off the electrical power supply by unplugging the power cord or by turning off the electricity at
the circuit breaker. (The temperature controller does not control the electrical power.)
• Turn off the gas at the manual gas valve, usually located immediately below the water heater.
• Turn off the incoming water supply. This can be done by turning off the water supply to the building.
WARNING
Bottom of water heater
Conduit to
GTK03U
Power Cord for
Water Heater
Cable Access Holes
Front of Water Heater
4. On VC Series models, use a knockout or step drill bit to enlarge the smaller hole to 3/4 in. (19 mm)
diameter. On KB/KBD Series models, the hole is already the correct size. Attach the conduit from
the GTK03U to the smaller access hole using the connector supplied.
1. Turn off the electrical power supply by unplugging the power cord or by turning off the electricity at
the circuit breaker.
2. Install the GTK03U pump according to the “Installation Guidelines for All Models” section and
system drawing in the Appendix.
3. Re-route the water heater power cord or wiring from the smaller access hole to the larger access
hole as shown in Figure 2.
Figure 2
If installing with a SENSEI™ model, continue to Section 3 for instructions.