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  1. poriordan

    Rinnai Tankless starts to run when cold tap turned on

    We have just installed a Rinnai RU 199IN tankless water heater. This is replacing an Eternal unit we had for several years. We are using exactly the same plumbing but are experiencing a problem with the Rinnai that we never had with the Eternal. Whenever we turn on any cold tap, the Rinnai unit...
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