Rinnai tankless water heater with recirculating pump manual

Recirculating Pump Comfort System This system uses the existing cold water pipe to send the unused water back to the water heater. This is a cost effective solution for homeowners who are frustrated with the wait for hot water but are unable to install the first option.

If you find you're not getting the hot water you need, start by lowering the temperature setting on your tankless water heater by a couple of degrees. It's counterintuitive, but it affects the hot/cold mix ratio and will activate the tankless water heater unit for lower-flow fixtures.