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  1. We live in a townhouse that has cinderblock firewalls between units, My hot water heater is in attic and we would like to replace it with a gas tankless. Is it against codes to mount it on firewall?

    • Hi Larry,
      It would depend on how your local code enforcement division will classify anchoring it to that cinderblock firewall. They might say that anchors, holes, etc. will compromise its integrity.

      I can’t find anything in a code book preventing such installation but to avoid redoing it in the future, I would either ask them (building department) or build a simple wall frame attached to the roof & floor framing and secure tankless WH to that structure instead of the cinderblock wall.

      Let me know if you have any other questions.

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