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Question DetailsAsked on 12/19/2017

I don't have any hot water come out of all my tabs. The cold water is o.k.Can you tell me what is the problem and h

I live in California so we don't have any frozen problem

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1 Answer


Thank you for ruling out the "frozen" issue, though I did have one case once in California which was a real head-scratcher - with a water pipe frozen because it ran right next to an air conditioner refrigerant line, in insulated wall space, which froze it up only on real hot days when the A/C was running a lot.

Here are links to a number of previous similar questions about hot water only going dead or mostly so - not much I can add to what I put in those answers, though reading through all them might put you to sleep. Generally - if this was a sudden shutoff, assuming no one shut off a valve somewhere on the hot line, it would normally be due to a exit flow tube blockage in the water heater (which can sometimes be solved by shutting it (and the burner/heat when doing this) off and then draining the tank, which can remove tank bottom sediment or broken plastic fill tube pieces blocking the outlet pipe. When draining the tank (which commonly can work just with the drain valve, not shutting off incoing flow) you need to leave a couple of large hot water flow valves open - like tubs or showers set on hot setting, so a lot of air can get into the hot pipes to let them drain back to the water heater and flush out the blockage in the pipes.

Sometimes, with the incoming cold water (and heating) turned off, and water heater drain valve wide open, putting cold water pressure on the hot side of a faucet with a hose from a nearby faucet to backflush the lines works too - though in any backflushing there is the risk that the water heater drain valve will then plug up if the blockage material is too large to pass through it.

Another less common cause is a blockage at the expansion tank - either because it was instlled with a one-way inflow valve which is blocked, or sometimes because the diaphragm in the tank ruptured and blocked the water flow because the tank was installed without a screen on the pipe to it.

Also, try to tie down whether this is low pressure, or low flow - if the pressure is high when any faucet is first opened wide but then drops right off, then is most likely a flow restriction somewhere - which lets the pressure build up when no water is running but cannot let enough water past to maintain the pressure, so spurts out full pressure intiially then drops off to low (usually not zero) flow after that. If basically no flow, if it gradually dropped off in flow rate, then corrosion products or sdeiment blockage or such in the pipes would be suspect - if sudden, then is normally a failed valve or expansion tank or some floating debris which moved into a pipe and blocked it.

Otherwise, these might help - in no particular order:

Answered 2 years ago by LCD

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