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    Navien NCB 240e Extreme coldwater sandwich and Pressure relief valve opening frequently

    Hey all, So let me describe my problem first and then I'll describe the specifics of my installation. The Problem: Over the past 2 weeks we have began experiencing the cold water sandwich for the first time since installation. It doesn't"t happen consistently, but when it does we often go from...
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    Proper pipe sizes for gas lines.

    Thanks for clarifying the calculations as Btu/cu ft. i was using 1100 Btu/cubic foot value, so pretty close. i got the 1100 value from a website http://docs.cityofsanrafael.org/CommDev/building/forms-and-handouts/gas-pipe-line-sizing.pdf that had formulas for figuring out pipe sizes. I get my...
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    Proper pipe sizes for gas lines.

    Hi everyone, I'm renovating my first floor including the kitchen and adding some better appliances. I think I've determined that my existing natural gas lines are undersized for the volume needed for my appliances. I'm using a gas dryer, boiler for hydronic system, instantaneous water heater...
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