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Wat does it mean if hot water comes out of the tap n then goes cold

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I would suspect, depending on how soon you get cold water, that the heater is not keeping up with demand.or the water heater has build up insulating the heat from the water, like lime and sulpher build up in the pipes.

Posted on Jun 18, 2009

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1 Answer

My hot water comes out of the tap hot, then after a few seconds it goes cold, what could this be?


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have you got hot water coming through the cold tap?
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Power out for 48 hours, tankless water heater located outside of house, temperature around 20 degrees, no hot water coming out of tap, where do i begin?


First, I don't even want to know why someone would put a tankless outside as you have found out...really bad idea. In order to help you, more information is needed. Is this a gas or electric unit? Or a gas unit with electric controls? Is it mechanically or electronically controlled ( a make and model would help). Are the water lines to or from the tank exposed? When you say no hot water coming from the tap does that mean when you turn on the hot water faucet you just get cold water or no water?

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No hot water coming out of tap but we do have cold water out of cold water tap...any suggestions??


Check your by-pass valve(s) at back of water heater. Water goes in cold to bottom fitting, and out hot at top fitting, so those 2 valves ( if any) need to be open, anything in between needs to be closed. There are a few different by-pass set-ups, so if that doesn't explain it, get back to me with a description of your valve set-up and I'll guide you through it. If valve(s) are all in proper position and still no flow through hot line, I'd suspect faulty check valve in between hot line connection and tank.

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Our rheem pronto tankless rutg-74xp red light will come home indicating hot water and stay on about 2 minutes and then turns off we have turned off and back on and let water run for 5 minutes and will come...


Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

Apr 24, 2011 | Rheem RTG-74PVN-2 Natural Gas Pronto Whole...

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Our atwood heater is firing up ok and running for a good while then turning itself off but we dont get any hot water out of the hot taps. Our water pump is working ok but we have this funny tap within the...


Cold goes in bottom fitting of water heater, so that valve has to be open, and hot comes out the top, so that has to be open, if there is one there, but any valve in between needs to be closed. There are a few variations so if you can explain where your valves are located in the system more precisely, I can help better. Perhaps you can send a digital picture with reply?

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No stop tap. cold water coming through cold taps in caravan but no hot water the carver cascade water heater is getting the water hot but it just wont come through the taps in the shower room or kitchen in...


your pipes are clogged, what if you were to not turn on the cold and turn on the hot does any water come out at all, with just the hot side turned on,, if not there could be a valve that has been turned off, or the pipes are clogged

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Hot water taps and showers pressure very low cold taps ok


there is a little cap on the hot and cold side above the shut off valves, turn the water off at these valve and take the caps off there are filters in there clean them off and reinstall them that should take care of the problem, you might want to flush the tank while your at it hook a hose to the hot side connector and run it out side or to a sump pump then turn on the cold water and flush it out you can also reverse this procedure by doing it on the cold side

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A trickle of hot water from taps, central heating ok


it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

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