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Old 04-25-2019, 06:59 AM   #31
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GPM don't mean **** until you look at the temperature rise chart that correlates to the GPM stated.
How could it not? Operating side by side a 5 gpm model vs an 11 gpm model (using the same incoming water temp), gpm certainly make a difference.

No offense but everybody knows temperature rise makes a difference. The great thing about living in the south is that it's not a huge concern.
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Old 04-25-2019, 08:21 AM   #32
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How could it not? Operating side by side a 5 gpm model vs an 11 gpm model (using the same incoming water temp), gpm certainly make a difference.

No offense but everybody knows temperature rise makes a difference. The great thing about living in the south is that it's not a huge concern.
Devils advocate , see what I did down there . Which is more? Temperature rise makes ALL the difference. If all things are equal then gpm is gpm.


5 gpm with 65 degree rise, at this temperature rise you will be fine anywhere in the south

11 gpm with a 35 degree rise, at this temperature rise you won't be bathing in 120 degree water during the winter or fall anywhere.
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Old 04-25-2019, 09:28 PM   #33
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temperature rise makes no difference if your water has been cut off. You install a 5 gpm unit in your 8 bedroom house and i as your neighbor will install three 11gpm units in my 8 bedroom house and let's both have houses full for thanksgiving. Now does gpm make a difference?

Not trying to be an ass but bigger is better.
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Old 04-26-2019, 04:55 AM   #34
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temperature rise makes no difference if your water has been cut off. You install a 5 gpm unit in your 8 bedroom house and i as your neighbor will install three 11gpm units in my 8 bedroom house and let's both have houses full for thanksgiving. Now does gpm make a difference?

Not trying to be an ass but bigger is better.
Depends on manufacturer and how honest they are with their 11 gpm claim at 35 degree temperature rise versus another manufacturer that states their heater will do 5 gpm with a 65 degree temperature rise. It's all in the temperature rise charts.
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Old 04-26-2019, 06:50 AM   #35
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What about brands that throttle the water to bring the water up to the requested temp vs brands that let the water pass through unthrottled?
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Old 04-26-2019, 06:50 AM   #36
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It's all in the temperature rise charts.
Now we agree.
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Old 04-26-2019, 07:45 AM   #37
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What about brands that throttle the water to bring the water up to the requested temp vs brands that let the water pass through unthrottled?
That goes back to the manufacturer and deceptive practices unless it is upfront.
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Old 04-26-2019, 06:08 PM   #38
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It's a design difference. You can choke the water until you get your desired temp (but less gpm) or let the water pass through full port (but lower temp). That is a designer's decision.
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Old 04-27-2019, 04:58 AM   #39
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It's a design difference. You can choke the water until you get your desired temp (but less gpm) or let the water pass through full port (but lower temp). That is a designer's decision.
I agree with you to a point, if it is not disclosed upfront then in my opinion it is deceptive. Especially to a normal home owner customer that doesn't know what we know as Plumbers.
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Old 04-27-2019, 10:15 PM   #40
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I would not think either approach would ever be an issue if you oversize the package. We have 2 and 3 heaters in some larger homes.
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