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Thread: Tankless hot water problems

  1. #1
    DIY Member casman's Avatar
    Join Date
    Sep 2004
    New York

    Default Tankless hot water problems

    Well we installed the rinnia model 2520 at the office and now there is little to no hot water. It takes 5 minutes, the plumber guy says well it comes out at 120 degrees but by time it gets where its going it drops to like 90 degrees. Still feels cold to us. He claims its because the pipes are in the ground which does makes sense. We are discussing having the pipes rerouted, and he is suggesting most of the walls would have to be torn down. Does this sound about right? The whole scenario, not just the wall thing. We had better overall response with a hot water heater....btw...Thanks for any info

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    The hot water heater may not have had a heat trap on it, so there was a little convection keeping water warm part way to the use point. The tankless system only turns on when it detects flow, so no convection heating of the line. You can't use a recirculation system, or you energy use will be a problem. Can you move the tankless system closer to the use point? Probably the only way to resolve this.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014


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