What is the minimum water flow required to operate a Rinnai tankless water heater?
Please keep in mind that the Rinnai tankless water heater needs to see over 0.6 gallons per minute of water flow through the hot side to ignite and to stay in operation. If the flow rate falls below this level, the unit will turn off because it senses that hot water is no longer needed. There are several possible solutions to minimum flow rate issues: lowering the temperature on the unit to a more comfortable temperature to avoid cutting in too much cold water, cleaning the inlet water filter on the cold water inlet of the unit (sediment build up in filter can decrease flow into the unit), cleaning or removing the aerators from showerheads or fixtures, or replacing low flow showerheads or fixtures. If you believe that this is not the issue, I recommend that you contact your original installer or plumber to service the unit. Please make sure that once you have a service technician on site that they call into our Technical Support Line at 1-800-621-9419 ext. 4491 MON-FRI 8AM-8PM EST for
