Nathan Meyers
New Member
I started having a problem recently with my Noritz tankless. Problem is when taking a shower (one knob, Speakman head, 1.5 gpm flow restrictor), it recently stopped keeping the burner on when the shower is set to a comfortable temperature. Plumber insists there is no problem, but I'm suspecting there is a problem with how the Noritz measures flow rate. Here's my story:
I'm measuring flow rate at the fixture using a measuring cup and a stopwatch: computing it from the time it takes to fill a quart measuring cup. Not perfect, but not terrible. Here are a couple of findings:
- At a two-knob sink faucet, I turn on only the hot water, and measure a flow of 1 GPM (it takes ~15 seconds to fill the quart measuring cup). Viewing the flow rate in Noritz maintenance mode, it reports a rate of .6 GPM.
- At the shower, turning the knob to full hot, I measure a flow of 1.5 GPM (it takes ~10 seconds to fill the measuring cup). The Noritz reports .9 - 1 GPM.
The plumber has tried to explain to me that the flow rate measured by Noritz's expensive computer and hardware isn't expected to match that at the fixture, but I'm really having trouble following his reasoning. Is he right? Am I crazy?
I'm measuring flow rate at the fixture using a measuring cup and a stopwatch: computing it from the time it takes to fill a quart measuring cup. Not perfect, but not terrible. Here are a couple of findings:
- At a two-knob sink faucet, I turn on only the hot water, and measure a flow of 1 GPM (it takes ~15 seconds to fill the quart measuring cup). Viewing the flow rate in Noritz maintenance mode, it reports a rate of .6 GPM.
- At the shower, turning the knob to full hot, I measure a flow of 1.5 GPM (it takes ~10 seconds to fill the measuring cup). The Noritz reports .9 - 1 GPM.
The plumber has tried to explain to me that the flow rate measured by Noritz's expensive computer and hardware isn't expected to match that at the fixture, but I'm really having trouble following his reasoning. Is he right? Am I crazy?