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My water heater won't circulate water. i think it is clogged with calcium

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One thing you might try is to shut off power or turn gas valve to pilot,as you didn't say if it was gas or electric. Hook up garden hose to drain valve and run hose to floor drain or sump basin. Shut off water supply valve to heater. Open drain valve and if you get a decent flow then let it drain tank about half way. If flow rate drops drastically then open hot side on faucet nearby to break vacumn.When you think tank is about halfway drained then shut off faucet if you opened one and close drain valve. Turn water supply valve back on and let tank refill. When it is full leave supply valve on and open drain valve and let water flush thru system for several mins. Close drain valve and run water on both hot and cold side of faucets fartherest away from heater as possible. Close this faucet
Turn tharmostat up as high as it will go and let heater run till it shuts off then return thermostat to original setting. Go through the drain and flush procedure a couple more times and this shold help break mineral deposits loose and flush them out. This should make for more efficeint operation and help prolong the tank life. Hope this helps you. Have a good new year and thank you.

Posted on Jan 02, 2011


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It may be that you need to rebuild the valve. There may be sediment from the hot water heater clogging it too.

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I am going to assume the circulator pump is on a hot water circulation loop. Turning the water back on could have stirred up the sediment that has collected in the bottom of the water heater. This could clog up and possibly ruin the impeller. Running for an extended period without circulating water can overheat and damage the pump also. It is a good idea to hook a hose to the water heater drain and flush out the sediment periodically. Hope this helps.

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When the pump is running, if I turn on the cold water faucet the check valve opens and closes rapidly making a loud knocking sound. This problem only developed after four years of trouble-free operation.

Clean out check valve with CLR calcium-lime-rust and see if functionality is restored.
Problem can also be caused by air bubble inside the line, caught at the check valve. Dissemble and reassemble parts. Install air vent.
Another option is to install direct return line with in-line check valve and air vent.
Parts can also be ordered.

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The circulation system should draw hot water directly from the water heater as shown on illustrations on link above.

The Grundfos pump works on a thermostat, and some work on a timer.
Can you hear the pump working?
There should be a humming sound.
Check the timer -or- thermostat setting.

It is possible the lines are clogged with sediment if you have hard water.

If I was going to fix the problem:
1) check thermostat or timer
2) listen for pump sound
3) check electricity going to unit
4) take apart the pipes and inspect for clogging
If there is a clog, I would flush the line or soak the part in CLR (calcium lime rust remover)

The circulation pumps are sealed and there is no way to take apart the motor, timer, or thermostat for repairs.

add a comment if you need more assistance.

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I have a laing cirulating pump thats is worhing but now making noise so i took it apart see nothing but it was hot when running so is there any thing i can do to fix before it burns out

Open following link for Re-circulation information and resources:

If the unit is getting hot, it may have already slowed and is now spiraling to it end.
Try bleeding air out of water lines, and clean autocirc with CLR calcium lime and rust remover.
Recirculation systems have a built in check valve so cold water side of faucet will work correctly. If this check valve is stuck open or closed, it can affect a lot of things in the plumbing system.
For example, stuck check valve can cause tankless water heater not to operate. It can also cause autocirc pump to overheat.
Lines, or elbows clogged with sediment can also cause same problems with recirculation system. If your system has direct return line to water heater that connects into the water heater drain port, then clog in line can cause overheated pump. Check water flow, check water lines, and clean out autocirc.

Upvote the help.
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Fixya is always less expensive than a service call.

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Over heat is caused by poor circulation of coolant. This problem can be: 1- The thermostat is not opening ( bad) causing coolant stagnant. 2- Water pump is bad, not circulate coolant. 3- Radiator is clogging up. It is full but water can not going through small clogging up tubes inside to have heat dissipated through the fines.
Since you also have no heat then I think the bad coolant causing the heater core clogged up also, unless the heater valve has a problem not allowing cooling flowing through the bypass hose to the heater core. Correct all 3 things above then you should be OK. Good luck.

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My Bosch on demand water heater is clogged. I cleaned the inlet line but seems to be inside the smaller copper tubing. HELP!

If you can access the pipe that is clogged, Poor some lime away into it . Let it sit and ad more as needed. the calcium will sofen and ca be flush out. Takes patience. Once you get some flow, fill the tubing with a descaling solution (hardware store) and let it sit. Pool acid works but must be thoroughly flushed out. be careful with acids, always wear gloves.

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wow! That heater that you have is meant for a very large swimming pool, quite a bit oversized, i bet i gets the job done quick though. I have seen before that somebody plumbed in a heater backwards, there are elevated arrows on the black manifold of the heater, make sure inlet and outlet are plumbed in correctly. Make sure you get your water tested. Because the water in your hot tub is no circulating as often (I assume) as a pool would be, the stagnate water sits inside the heat exchanger. What can happen, for instance, if you have high calcium, is the certain tubes inside the heat exchanged can get so clogged with calcium and they are completely shut and the banging noise is due to excessive heat build up inside the heat exchanger. This can ruin a heat exchanger very quickly and the heat exchanger is half the cost of the heater if you were to get a new one. You can check and see if tubes in the heat exchanger are clogged by taking the manifold off of the heat exchanger, and shining a flashlight down the different tubes. However you have to disassemble quite a bit to actually be able to do that.

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