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You are talking about length of time to get hot water from water heater.What diameter pipe are you talking about? What type of faucet do you have?
1/2" pipe has inside diameter of .54" and holds 1.2 gallons per 100 feet
10 meters is 32 feet and holds .4 gallons
Average faucet puts out 2 gallons per minute, so 30 seconds you should get 1 gallon of water.
Put a bucket under faucet and check amount of water flow.
Assuming you draw just hot water from the faucet, then 30 seconds is slow for receiving hot water.
If you have single-handle faucet and raise handle straight up in middle, then you are drawing half hot and half cold, so it would take 30 seconds for hot to arrive.
If hot water is slow, the problem might be crossover.
http://waterheatertimer.org/Crossover.htmlor low water pressure due to clog in water line
http://waterheatertimer.org/Low-hot-water-pressure.htmlOther problems could include clogged water filter, clogged water softener, defective pressure valve, and low water pressure.
Sources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.htmlhttp://waterheatertimer.org/Water-heater-recirculation-system.html
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