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Old 04-28-2010, 05:17 PM   #1
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Water pressure to tub


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Originally Posted by Yoyizit View Post
My tub gives me 6 GPM, hot + cold. What flow rate are you getting?
How exactly do you measure this?

I have a problem with low hot water pressure in the bath. The flow gets weaker as I make the water hotter... I have an on-demand electric water heater, this may have something to do with the low supply?
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Old 04-28-2010, 05:20 PM   #2
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Water pressure to tub


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Originally Posted by kitvan View Post
How exactly do you measure this?

I have a problem with low hot water pressure in the bath. The flow gets weaker as I make the water hotter... I have an on-demand electric water heater, this may have something to do with the low supply?
A bucket and watch. One of these 2 gal. laundry detergent containers are good for this because with the small opening there's no splashing.
6 GPM is 2 gals in 20 seconds, so move fast. Full on and full off.

On demand should give you a constant flow rate; it's how hot the water is, is the problem.

See if you get 6 GPM at the outside hose faucets.

Last edited by Yoyizit; 04-28-2010 at 05:23 PM.
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Old 04-28-2010, 05:25 PM   #3
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Water pressure to tub


Haha I should of thought of that.

Thanks for the quick advice
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Old 04-30-2010, 09:12 PM   #4
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Water pressure to tub


Doesn't an electric on-demand water heater yield lower flow when set to a higher temp? It can only put so many btus out per minute so to get higher temp doesn't it have to reduce the amount of water per minute it's heating?
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Old 05-01-2010, 10:02 AM   #5
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Water pressure to tub


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Doesn't an electric on-demand water heater yield lower flow when set to a higher temp? It can only put so many btus out per minute so to get higher temp doesn't it have to reduce the amount of water per minute it's heating?
You have a link to this info? The thing would then need a controlled valve.
I thought you just got lukewarm water.
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Old 05-01-2010, 11:44 AM   #6
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Water pressure to tub


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You have a link to this info? The thing would then need a controlled valve.
I thought you just got lukewarm water.
I'm not the op but thought he said flow gets weaker when he makes the water temp higher (which I may have wrongly assumed meant he was setting the water heater to a higher temp).

Have no link and probably mistaken but if an on demand heater is set to a higher temp doesn't it have to decrease flow to achieve it unless it's a fancy modulating one with multiple elements. If it's just one element isn't it either on or off at it's full power? If so then the only way to regulate temp is water flow isn't it? I doubt it rapidly cycles off and on as that would fail quickly.
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