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40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: Dennis S
Date: August 05, 2022 09:37AM
?
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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: mikebw
Date: August 05, 2022 09:47AM
Depends on the temperature of the cold water, the desired hot temperature and how quickly your gas or electric heating element can transfer that energy into the water.

So, 20 minutes. smiling smiley
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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: cbelt3
Date: August 05, 2022 09:58AM
You can use the intervening time to yell at the kids for using up all the hot water.
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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: GGD
Date: August 05, 2022 10:02AM
I sometimes shut off an electric 40gal heater in a building that isn't used all the time and when I turn it back on I see about 45 minutes of high electric usage getting it to the point where the thermostat shuts off. But this is probably starting with "room temperature" water rather than "cold" water.
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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: Fritz
Date: August 05, 2022 10:02AM
direct or indirect?
Ours is indirect. After power off it takes about 15 mins to get shower hot.



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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: Filliam H. Muffman
Date: August 05, 2022 10:02AM
Electric? Gas? BTU rating? Age?

I agree with 20 minute estimate without any other info. A 30 year old gas unit could lose a 20% of the heating efficiency from rust in the burner area, and lose another 25% from sand/dirt/scale buildup in water side of the tank.



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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: Dennis S
Date: August 05, 2022 10:11AM
20 minutes is a close enough estimate. Thanks.
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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: NewtonMP2100
Date: August 05, 2022 10:16AM
....could be sponge bath time [ sponge worthy? ].....mmmm......



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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: JoeH
Date: August 05, 2022 10:17AM
Yeah, should be enough for a short shower, 4-5 minutes. But don't expect to shower for 10 minutes.
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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: RAMd®d
Date: August 05, 2022 01:37PM
I take a military shower, a light rinse to wet down, secure the water, soap and scrub, then stronger spray to rinse.

This stretches hot water quite a bit, when it's in short supply.






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Re: 40 gallon water heater out of hot water. How long for it to replenish for a shower?
Posted by: stephen
Date: August 06, 2022 08:49AM
When I used to write ads for the natural gas company, one of the big selling points was that natural gas water heaters "recover" faster.
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