Moved in to a new house with a Rinnai RU199iN tankless water heater and noticed that the sinks on the opposite side of the house (and 2 floors up) take forever to get hot water. So, I'm looking to add a recirculating pump. A call to Rinnai support told me that I need a dedicated return line for this model to support a recirc pump, but I can't tell if the capped off line to the left of the water heater is the return line or not. Show Looking for advice on what pump to use and if anyone can tell me whether or not the red pipe on the left is likely to be a dedicated return line. https://imgur.com/a/KftT8yD Waiting for hot water can be frustrating, costly, and wasteful. Recirculating technology eliminates the wait, so hot water is always at the ready. Our technology permits this even if your home does not have a dedicated return line. If your home does not have a dedicated return line, select Rinnai tankless water heaters can offer faster hot water
without adding an additional cold return line. This technology allows for the simple installation of a thermal bypass valve at the fixture farthest away from the water heater. Once installed, the unit temporarily uses the cold water line for recirculation. Can you install a recirculation pump on a tankless water heater?Tankless heaters with recirculation pumps: The cost is $250 to $415 more than those without pumps. This is the best choice if you're installing a new water heater. It saves the cost of pump installation. Separate recirculation pumps: If you have a tankless unit without a pump, one can be installed.
Does Rinnai have recirculating pump?Rinnai tankless water heaters have built-in pumps with Smart-Circ™ Intelligent Recirculation™ that learns your schedule. No dedicated return line, no problem.
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How to install a recirculating pump on a rinnai tankless water heater
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