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How far hot water travels in pipes in 30 seconds
How long does it take to fill 1 gallon jug10 seconds = 6 gallon per minute
15 seconds = 4 gallon per minute
20 seconds = 30 gallon per minute
30 seconds = 2 gallon per minute
|Gpm is gallon per minute.
Average faucet can be 2 gallons per minute
|Estimate distance from
water heater to faucet. Figure that pipe make turns inside walls.
Typical household pipes to faucet are ½
|Estimate water flow at
Average faucet can be 2 gallons per minute.
Average tub can be 2 - 1/2 Gpm.
At 2 Gpm, the faucet will fill 1 gallon container in 30 seconds.
To estimate Gpm water flow at faucet, use 1 gallon container and cooking timer.
|Compare distance from water heater to amount of time
hot water takes to arrive using chart
This will give baseline for condition of plumbing pipes
(a) If water flow is low, then you may have clogged pipes.
Or clogged water heater. Etc.
If flow on hot side is slower than cold side, then you have clog in hot water pipes.
Read about low water pressure
(b) If water flow at single handle faucet is good, and you get plenty of cold water, BUT hot water isslow to arrive
Remember if handle is lifted in center, then equal amounts of cold and hot are drawn, sodistances shown in chart are halved.
If hot water never arrives or is very slow to arrive, then faucet cartridge is bad.
If hot water is slow to arrive at all faucets, then there is a crossover problem.
Read about crossover
|d) If you have recirculation system, and cold water
never arrives, or hot water never arrives, then you have crossover
problem shown in chart above.
Clean recirculation pump and water connections with white vinegar or CLR.
Water heater recirculation systems
Low hot water pressure
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