Rinnai RU180i Recirculation

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hokiecjb97

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Just installed a Rinnai RU180i that has circ-logic, but requires an external pump. I can’t find the pump that works with this unit and one that will work with a crossover valve as I don’t have a dedicated return. They offer a GTK03 and GTK15, but neither seem to say they are compatible and neither mention cross-over (comfort valves). Any recommendations? I put the old recirc pump in the circuit, but it doesn’t drive enough flow to kick the unit on.
 

Jadnashua

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If you're going to fire the thing up frequently, I'm not sure I see the advantage of a tankless system.

IMHO, the best way to get recirculation with a tankless is to use a small external tank. Some tankless systems have one built-in.
 
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